Abstract
Background:
This study examined transactional associations among maternal depression, maternal sensitivity, and child engagement in the context of a low-income, diverse sample with maternal cigarette smoking during pregnancy (MSDP) as a moderator of these transactions.
Methods:
A random-intercept cross-lagged panel model was used to investigate within- and between-family variability from infancy to toddlerhood. The sample included 247 mother-child dyads (47% girls; 51% African-American; 178 MSDP, 69 non-MSDP). Assessments were conducted once during each trimester of pregnancy and at 2, 9, 16, and 24-months of child ages.
Results:
Between-family associations revealed that children exposed to higher levels of sensitive parenting across time had higher behavioral engagement from infancy to toddlerhood. At the within-family level, increased sensitive parenting at 9-months was predictive of increased child engagement at 16-months which in turn predicted increases in sensitive parenting at 24-months. Increased maternal depression was concurrently associated with lower maternal sensitivity at 2-months and lower child engagement at 16-months. Contrary to hypotheses, changes in maternal depression were not associated to changes in parenting or child engagement. These associations did not vary between prenatally smoking and non-smoking mothers. However, there was significantly higher stability in maternal depression across time among non-smoking mothers compared to those in the MSDP group. Additionally, increased maternal depression was related to lower-than-expected child engagement at 9 months only for the non-smoking group.
Conclusions:
Results highlight transactional processes at the within-family level and the importance of timing for parent and child effects on transactional processes.
Keywords: depression, maternal-child, addiction, child/adolescent, pregnancy and postpartum, smoking, maternal depression, prenatal tobacco exposure, mother-child interactions, parenting, bidirectional associations, random intercept cross-lagged panel model
Parent-child interactions, while demanding, can be very rewarding. Viewing an infant’s smiling face elicits a dopaminergic reward response (Strathearn et al., 2008), and the pleasurable nature of infant cues may function as a method of self-regulation that diminishes parents’ stress and promotes sensitive caregiving (Belskey et al., 1991). Maternal depression, characterized by fewer positive emotions and prolonged negative emotions (Joorman & Gotlib, 2010), may disrupt this process. Depression is associated with less positive and more negative parent-infant interactions, as well as diminished pleasure in response to infant cues (Campbell et al., 2004; Cohn et al., 1990; Graham et al., 2000). Thus, parent-infant interactions may be less rewarding to depressed mothers and lead to withdrawn or hostile caregiving. Over time, less sensitive caregiving may decrease children’s engagement with their mothers, further reducing the quality of these interactions.
Individual differences in child responsiveness and positivity may also influence parent-child interactions. Interacting with a difficult or less engaged infant may be more demanding and less rewarding for parents, which may decrease maternal sensitivity and lead to higher levels of depression over time (Choe et al., 2013; Putnam et al., 2002; Roben et al., 2015). In this way, parent- and child-driven processes may influence each other, creating bidirectional feedback loops (Masten & Cicchetti, 2010; Sameroff & Mackenzie, 2003). Evidence suggests that depression and sociodemographic risk during pregnancy may contribute to early differences in child behavior and emotion regulation (i.e., through fetal programming; Dunkel-Schetter & Tanner, 2015), but the scarcity of longitudinal investigations beginning in the prenatal period has limited our ability to investigate these risk factors. To delineate these important mechanisms, we examined bidirectional processes between maternal depression and child engagement via sensitive parenting in a sample of mother-child dyads recruited in the first trimester of pregnancy and assessed across the first two years of life.
Depression and Substance Use
Depression’s effect on parenting and child outcomes may be moderated by several factors, including maternal tobacco use (Goodman et al., 2011). Maternal smoking during pregnancy (MSDP) is associated with higher depression and stress, especially among low-income pregnant smokers (Bullock et al., 2001; Ludman et al., 2000; Munafò et al., 2008). Depression is also associated with continued MSDP (Eiden et al., 2013), suggesting that the combination of depression and MSDP prolongs the effect of nicotine exposure, potentially magnifying depression’s impact on parenting. In fact, per Rutherford and Mayes’ (2017) reward-stress dysregulation model, nicotine exposure damages and disrupts parents’ reward and regulation systems, lessening the saliency of infant signals and decreasing sensitive parenting. Therefore, mothers who smoke during pregnancy may be at increased risk of disrupted stress/reward regulation, and thus show more salient alterations in transactional processes during mother-child interactions compared to demographically similar non-smoking mothers.
MSDP is also linked to higher levels of irritability and emotion dysregulation in children (Cornelius & Day, 2009; Schuetze et al., 2017), suggesting that nicotine-exposed infants may be more difficult, less positive, and less responsive during mother-infant interactions than non-exposed infants. These infant behaviors may increase the likelihood of more demanding and less rewarding mother-infant interactions, potentially decreasing maternal sensitivity and increasing maternal depression over time. Therefore, the effect of child engagement on maternal depression and parenting may be most salient for these children.
Current Study
Despite substantial links among depression, MSDP, child engagement, and parenting, previous literature has not examined transactional mechanisms between these factors. Thus, three components guided our study. First, we included prenatal depression and sociodemographic risk into our model as exogenous variables. Second, we tested reciprocal associations among maternal depression, sensitive parenting, and child engagement during mother-child interactions from infancy to toddler age. Third, we tested MSDP as a moderator of transactional associations.
Our hypotheses were threefold: (a) Based on evidence that stress and depression during pregnancy are independent risk factors for postnatal depression and adverse child outcomes (Dunkel-Schetter & Tanner, 2015), we predicted that prenatal depression and sociodemographic risk would be related to higher levels of postnatal maternal depression and lower levels of sensitive parenting and child engagement; (b) Consistent with transactional models of parent-child interactions (e.g., Patterson & Reid, 1970), we predicted that there would be bidirectional associations among maternal depression, sensitive parenting, and child engagement across time, such that maternal depression would predict decreases in child engagement via decreases in sensitive parenting whereas decreases in child engagement would predict increases in maternal depression and decreases in maternal sensitivity over time; (c) Consistent with Rutherford and Mayes’ reward-stress dysregulation model (2017), we expected that MSDP would make all associations among maternal depression, sensitive parenting, and child engagement more pronounced.
Method
Participants and Procedure
Pregnant women who presented for care at an urban prenatal clinic completed eligibility screening at their first prenatal appointment (see author citation, 2018 for procedural details). The final sample consisted of 247 mother-infant dyads (178 MSDP group, 69 non-MSDP group, 47% female). Mothers ranged in age from 18 to 39 years (M = 24.09, SD = 5.00). Mothers were 51% African American, 31% White, and 6% other or mixed race with several mothers identifying more than one race, and 19% Hispanic ethnicity. Most mothers in this sample were high school graduates (60%), 65% were on Medicaid, 53% on Food Stamps. Forty six percent were married or cohabiting, 32% were in a relationship but not cohabiting, 21% were single, and 1% were divorced. Mothers in the MSDP group were individually matched on age and highest education level, but smokers were oversampled to allow for a full range of light to heavy smokers. The protocol was approved by the Institutional Review Board. Assessments were conducted once during each trimester and again at 2, 9, 16, and 24-months of child age.
Maternal Smoking During Pregnancy
MSDP was measured by maternal reports on the Timeline Follow-Back Interview (Sobell & Sobell, 1992), maternal saliva assayed at the end of each trimester, and infant meconium assayed after delivery (see author citation, 2018 & author citation, 2017 for further details). Families were assigned to the smoking group based on positive results on any of these criteria.
Cumulative Demographic Risk
A cumulative demographic risk (CDR; Rutter, 1981) was computed from 4 variables: maternal race, education, occupation, and partner status. If participants belonged to any racial minority group (69%), had below high school education (40%), or were single status (not married, cohabiting, or in a relationship; 21%), they were assigned a score of 1 for that risk category. Maternal occupation was coded using the Hollingshead scale (1975; M = 2.09, SD = 1.61, range = 1–8), divided by the maximum value of 9 to compute a proportion, and then re-coded so higher numbers indicated lower occupation status (greater risk). The final CDR variable was created by averaging the four risk variables and thus had a possible maximum score of 1 (M = 0.67, SD = 0.27, range = 0.07–0.96), with higher scores indicating greater risk. First proposed by Rutter (1979, 1981), the CDR has a long and rich history of use in the field of child development (see Evans, Li, & Whipple, 2013 for a critical review).
Maternal Depression
Maternal depression was assessed during the second and third trimester and postnatally using the Beck Depression Inventory (BDI-II; Beck et al., 1996). As 2nd and 3rd trimester BDI-II scores were highly correlated (r = 0.69, p < .001), they were averaged (M = 15.54, SD = 7.83, Range = 0–48.5) to indicate prenatal depression. The BDI-II had good internal consistency (Cronbach’s α ranged from 0.86 to 0.92; see Table 2).
Table 2.
Bivariate Correlations of Study Variables
| Variable | 2. | 3. | 4. | 5. | 6. | 7. | 8. | 9. | 10. | 11. | 12. | 13. | 14. |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
| |||||||||||||
| Prenatal | |||||||||||||
| 1. Cumulative Demographic Risk | .05 | .00 | −.08 | −.10 | .01 | −.10 | −.24** | −.16* | −.11 | −.26** | −.12 | −.12 | −.24** |
| 2. Maternal Depression | .07 | .56** | −.11 | .02 | .52** | −.10 | .05 | .55** | .03 | −.04 | .43** | −.16* | |
| 3. Child Sex (female = 0, male = 1) | .11 | −.10 | −.08 | −.00 | .05 | −.24** | .07 | −.10 | −.19** | −.00 | −.11 | ||
| 2 Months | |||||||||||||
| 4. Maternal Depression | −.16* | .01 | .47** | −.02 | .11 | .47** | .12 | .11 | .41** | 0.11 | |||
| 5. Sensitive Parenting | −.01 | −.00 | .37** | .00 | .01 | .38** | .23** | −.06 | .37** | ||||
| 9 Months | |||||||||||||
| 6. Child Engagement | .05 | .27** | .28** | .01 | .14 | .28** | .09 | .07 | |||||
| 7. Maternal Depression | .00 | .14 | .55** | .17* | .00 | .49** | −.05 | ||||||
| 8. Sensitive Parenting | .26** | −.04 | .58** | .25** | .03 | .43** | |||||||
| 16 Months | |||||||||||||
| 9. Child Engagement | −.07 | .40** | .40** | .09 | .32** | ||||||||
| 10. Maternal Depression | .04 | .03 | .54** | −.11 | |||||||||
| 11. Sensitive Parenting | .23** | .07 | .52** | ||||||||||
| 24 Months | |||||||||||||
| 12. Child Engagement | .10 | .52** | |||||||||||
| 13. Maternal Depression | .04 | ||||||||||||
| 14. Sensitive Parenting | |||||||||||||
p < .05
p < .01.
Sensitive Parenting and Child Engagement
Sensitive parenting was assessed from observed mother-infant interactions at all postnatal assessments. At 2-months of infant age, mothers were asked to feed their infants, as they would at home. During the subsequent laboratory visits, mothers were asked to interact with their children as they would at home for 10 minutes in a room with age-appropriate toys. Child engagement was assessed during the free-play tasks at age 9, 16, and 24-months. Interactions were coded using the Parent-Child Early Relational Assessment (Clark et al., 1997) by two sets of coders trained to reliability and blind to smoking status. Sensitive parenting was the average of 11 items reflecting positive tone of voice, affect, verbalizations, responsiveness, sensitivity, involvement, and connectedness with the child rated on a scale of 1–5 and averaged (higher scores = more sensitivity). Child engagement scale was the average of 8 items that reflected child’s positive affect and responsiveness during the interaction rated on a scale of 1–5 and averaged (higher scores = more child engagement). Cronbach’s α ranged from α = 0.73 to α = 0.86. Inter-rater reliability was calculated on 10–13% of the tapes and ranged from intraclass correlation coefficients ranged from .90 to .95.
Missing data
Of the 247 enrolled dyads, five were missing at 9-month assessment, nine dyads were missing at 16-month assessment, and 15 dyads were missing at 24-months assessment. Missing data were handled using full-information maximum likelihood estimates. Dyads with complete versus missing data did not significantly differ on maternal age, education, or any of the study variables.
Analytic Plan
We used the random intercept cross-lagged panel model (RI-CLPM: Hamaker et al., 2015; Keijsers, 2016) to examine relations among maternal depression, sensitive parenting, and child engagement across the first two years of life. While traditional cross-lagged panel modeling (CLPM) is commonly used to test reciprocal influences, this approach fails to distinguish between-person estimates from within-person processes. Unlike traditional CLPM, RI-CLPM allows for the disentanglement of within- and between-person variability, and as such is an ideal method to model transactional associations over time within families. In this paper, within-person and between-person results are described as within-family and between-family, respectively.
Three latent random intercepts (RIs) were included in the model to capture stability in maternal and child variables across time. Correlations between the RIs reflect associations among stable between-family differences in maternal depression, sensitive parenting, and child engagement, while the concurrent and across time correlations capture the within-family associations at each time (e.g., if a mother scores higher on depression than expected, does her child also score lower on child engagement than expected?). The auto-regressive paths capture the extent to which within-person deviations at t + 1 can be predicted by deviations from their expected scores at t. Similarly, cross-lagged effects reflect the extent to which within-family deviations in child engagement at t + 1 can be predicted by deviations from a family’s expected level of maternal depression and sensitivity at t. To test the invariance of the associations across time, we compared a baseline model in which these effects were freely estimated to models in which the autoregressive and lagged effects were constrained to be equal across time.
We first analyzed RI-CLPMs with all structural paths constrained to be equal between the MSDP and non-MSDP group. Next, we used multiple-group path analysis with exposure group (Non-MSDP = 0; MSDP = 1) as the grouping variable. Using a stepwise process, we examined whether freeing the lagged effects (i.e., cross paths and stability paths for parenting and child engagement) and correlated change parameters in our baseline RI-CLPMs resulted in a significantly better model fit. All analyses were completed using Mplus v.7.2 (Muthén & Muthén, 1998–2014).
The degree of model fit was assessed using the comparative fit index (CFI), the Standardized Root Mean Square Residual (SRMR), and the root mean square error of approximation (RMSEA) with its 90% confidence interval, using conventional standards (see Hu & Bentler, 1999). Model selection was based on the Chi-square difference (Δχ2) test where a significant Δχ2 indicates the model with more freely estimated parameters fits the data better. If there was no significant fit improvement, the model with equality constraints was selected to preserve parsimony.
Results
Preliminary Analysis
Relations between study variables and covariates
Means and standard deviations of the study variables for both groups are presented in Table 1. We computed bivariate correlations to examine relations among the covariates and the study variables and to detect stability of variables across time (see Table 2).
Table 1.
Means and Standard Deviations of Study Variables
| Variable | Total | Non-MSDP | MSDP | ||||
|---|---|---|---|---|---|---|---|
|
| |||||||
| M | SD | M | SD | M | SD | t-test | |
|
| |||||||
| Prenatal Period | |||||||
| Cumulative Demographic Risk | .49 | .25 | .51 | .25 | .48 | .25 | .78 |
| Maternal Depressive Symptoms | 15.27 | 7.73 | 13.45 | 7.55 | 15.98 | 7.70 | −2.36* |
| 2-Months | |||||||
| Maternal Depressive Symptoms | 10.08 | 7.43 | 8.12 | 6.59 | 10.85 | 7.62 | −2.63** |
| Sensitive Parenting | 4.06 | 0.67 | 4.13 | 0.64 | 4.03 | 0.67 | 1.07 |
| 9-Months | |||||||
| Child Engagement | 4.36 | 0.46 | 4.39 | 0.40 | 4.34 | 0.48 | 0.80 |
| Maternal Depressive Symptoms | 10.25 | 8.42 | 7.54 | 7.61 | 11.38 | 8.51 | −3.15** |
| Sensitive Parenting | 3.87 | 0.81 | 3.89 | 0.77 | 3.86 | 0.83 | 0.22 |
| 16-Months | |||||||
| Child Engagement | 4.36 | 0.44 | 4.34 | 0.42 | 4.37 | 0.46 | −0.40 |
| Maternal Depressive Symptoms | 9.18 | 8.38 | 7.63 | 8.08 | 9.81 | 8.44 | −1.71 |
| Sensitive Parenting | 3.87 | 0.72 | 3.83 | 0.83 | 3.88 | 0.69 | −0.51 |
| 24-Months | |||||||
| Child Engagement | 4.03 | 0.56 | 4.02 | 0.59 | 4.04 | 0.55 | −0.19 |
| Maternal Depressive Symptoms | 8.42 | 7.81 | 7.30 | 6.80 | 8.89 | 8.17 | −1.36 |
| Sensitive Parenting | 3.39 | 0.79 | 3.42 | 0.76 | 3.37 | 0.81 | 0.39 |
Note.
p < .05
p < .01
Between- and within- family variance
To examine the proportion of variance explained at the between- and within-family levels, we computed intraclass correlations (ICCs). The ICC for maternal depression suggested that the variance explained within- and between-family was relatively equal (ICC = .502). Variations in child engagement were due more to within-family changes across time than to between-family differences (ICC = .312), as were variations in maternal sensitivity, though to a lesser extent (ICC = .443).
Model comparisons
To make the model as parsimonious as possible, we first compared baseline models with lagged (i.e., cross paths and stability paths) and correlated errors constrained to be equal across time to models in which these effects were freely estimated. We also compared the RI-CLPM to the traditional CLPM and found that extending the CLPM with RIs significantly improved the model fit Δχ2 (6) = 122.44, p < .001, suggesting that the disentanglement of within- and between person variance offers a better representation of the data. Specific constraints for the RI-CLPM with the most optimal fit are noted in Figure 1.
Figure 1.
Multiple group RI-CLPM examining relations between maternal depression, sensitive parenting, and child engagement across the first two years of life, controlling for demographic risk and child sex. Standardized beta coefficients are presented. Only significant paths for the multigroup model are presented for ease of presentation. In the full group model, the following paths were constrained: autocorrelations for maternal depression and child engagement; correlated change between maternal depression and sensitivity; cross-lagged paths between engagement and depression, depression and sensitivity, and depression and engagement. In the multigroup model all paths were free to vary except autocorrelation for depression between groups, autocorrelation for depression in the non-MSDP group, autocorrelation between sensitivity at 2 and 9 months, and between-level associations. *p < .05, *** p < .01.
Primary Analysis
Child sex was related to sensitive parenting at 16-months (β = −0.15, p = .03) with mothers of boys showing less sensitivity. Child sex was also associated with child engagement at 16 (β = −0.28, p < .001) and 24 (β = −0.21, p = .007) months with boys being less engaged. Higher demographic risk was only associated with higher levels of prenatal depression (β = 0.18, p = .01).
RI-CLPM full sample
The final model showed good fit, χ2 (57) = 96.39, p = .0142, CFI = .95, RMSEA = .05 [.03, .07], SRMR = .07. Concurrent associations suggested that at 2-months, higher maternal depression was related to less sensitive parenting (see Table 3). At 9-months, higher-than-expected sensitive parenting was associated with higher child engagement. At 16-months, higher-than-expected levels of maternal depression were related to lower-than-expected levels of child engagement, while higher-than-expected sensitive parenting was associated with higher-than-expected child engagement. At 24-months higher-than-expected sensitive parenting was related to higher-than-expected child engagement.
Table 3.
Between and Within -Level Estimates from the RI-CLPM
| Associations | |||
|---|---|---|---|
|
| |||
| Overall | MSDP | Non-MSDP | |
|
| |||
| Between-level associations | |||
| Depression ←→ Sensitive parenting | −.06 | −.14 | −.14 |
| Depression ←→ Child engagement | .14 | .17 | .17 |
| Sensitive parenting ←→ Child engagement | .26* | .29* | .26* |
| Within-level associations | |||
| 2 Months | |||
| Depression ←→ Sensitive parenting | −.26** | −.28** | −.28** |
| 9 Months | |||
| Depression ←→ Sensitive parenting | .04 | .03 | .03 |
| Depression ←→ Child engagement | .04 | .19 | −.32* |
| Sensitive parenting ←→ Child engagement | .27** | .29** | .29** |
| 16 Months | |||
| Depression ←→ Sensitive parenting | .05 | .04 | .04 |
| Depression ←→ Child engagement | −.28** | −.26** | −.26** |
| Sensitive parenting ←→ Child engagement | .43*** | .40*** | .40*** |
| 24 Months | |||
| Depression ←→ Sensitive parenting | .05 | .04 | .04 |
| Depression ←→ Child engagement | .06 | .05 | .05 |
| Sensitive parenting ←→ Child engagement | .55*** | .55*** | .55*** |
Note.
p < .05
p < .01
p < .001.
Model fit indices were CFI = .95 for the full sample and CFI = .90 for the moderated model.
Higher-than-expected sensitive parenting at 9-months predicted higher-than-expected sensitive parenting at 16-months. There was also evidence of a transactional loop such that higher than expected sensitive parenting at 9-months was predictive of higher-than-expected child engagement at 16-months, which was then prospectively predictive of higher-than-expected sensitive parenting at 24-months (see Figure 1).
RI-CLPM multi-group by exposure group
Results from multi-group RI-CLMP are presented in Table 3. Maternal depression appeared stable from 2 to 24-months for the non-MSDP group, but not for the MSDP group. The only path that was different between groups was the concurrent association between depression and child engagement at 9-months. For the non-MSDP group, higher-than-expected maternal depression was related to lower–than-expected child engagement.
Discussion
Using a longitudinal design with a high-risk sample, this study extends research on transactional processes within families in multiple ways. First, our study adds to prior research by examining moderation of these processes by MSDP. Second, we utilized a novel statistical approach, the RI-CLPM, which allowed us to examine change and transactional processes at the within-family level (i.e., where processes between children and their environments occur). Finally, examining these processes during the first two years of life allowed us to investigate a critical period of development where maternal depression rates increase (Gelave et al., 2016) and children are most sensitive to depression’s effects on parenting (Field, 2010). Findings highlight transactional processes at the within-family level with higher-than-expected maternal sensitivity at 9-months prospectively predicting higher-than-expected child engagement at 16-months, which in turn was predictive of higher-than-expected maternal sensitivity at 24-months.
Prenatal Risk Factors
Bivariate associations revealed moderate stability for maternal depression from the prenatal period to toddler age. Additionally, prenatal depression was negatively associated with sensitive parenting at child age 24-months. CDR was negatively associated with sensitive parenting at child age 9, 16, and 24-months. Mothers’ CDR was related to increased prenatal, but not postnatal depression. Within our model, mothers’ prenatal depression and CDR were not related to future changes in parenting or child engagement. These findings suggest that a child’s postnatal environment accounts for unique variance in changes in maternal and child interactive behavior across the first two years of life.
Within- and Between- Family Effects
Sensitive Parenting and Child Engagement
At the between-family level, children exposed to more sensitive parenting across time had higher levels of engagement from infancy to toddlerhood. These findings are consistent with CLPM studies revealing more sensitive parents experience more child engagement in parent-child interactions compared to less sensitive parents (Eiden et al., 2011; Perry et al., 2014). Furthermore, within-family cross-lagged effects confirmed reciprocal associations between sensitive parenting and child engagement. Mothers’ increased sensitivity at 9-months predicted increased child engagement at 16-months, which in turn was predictive of increased sensitive parenting at 24-months. These findings suggest mother-driven effects on dyad interactions such that increased sensitive parenting led to more child engagement which led to future increases in sensitive parenting. Interestingly, these transactional processes were delayed until child ages 16 and 24-months. This suggests that child-driven effects may be initially smaller, but gain more salience as children develop their social, cognitive, language, and motor abilities.
Maternal Depression
There were no significant associations between maternal depression and mother-child interactions at the between-family level. Contrary to our hypotheses, maternal depression was not associated with changes in sensitive parenting within mother-child interactions over time. Indeed, increased depression was associated with lower levels of sensitive parenting only at 2-months of age. However, we found concurrent associations between maternal depression and child engagement at 16-months that were not related to changes in sensitive parenting. Additionally, there were no significant causal pathways from child engagement to maternal depression, suggesting that prospective associations between maternal depression and parent-child interactions may be primarily parent-driven. Given the lack of association between maternal depression and sensitive parenting, further investigation is necessary to identify other maternal factors that may contribute to this association. For example, mothers’ use of language and vocabulary has been found to contribute to their child’s engagement during mother-child interactions (Pearson et al., 2016). Previous studies have found that mothers with depression speak less and use more negative verbal expressions during their interactions with their children, potentially diminishing child’s engagement (Bornstein et al., 2010). Given our findings that transactional processes between parenting and child engagement were only apparent at critical periods of language development (16 and 24-months; McMurray, 2007), it is possible that differences in maternal language may contribute to the association between maternal depression and child engagement. However, as we found no association between maternal depression and child engagement at 24-months, it is possible that sensitive parenting may buffer the direct association between maternal depression and child engagement and may still represent an intervention target.
Group Differences
Overall, mothers in the MSDP group had higher levels of depression prenatally and at 2 and 9-months postpartum compared to non-smoking mothers. However, results from our RI-CLPM suggested that while maternal depression was stable from 2 to 24-months for non-smoking mothers, it was not stable for the MSDP group. Although we hypothesized that co-occurring depression and smoking would magnify disruption to parents’ stress/reward regulation, it is possible that the positive mood or relief parents experience when smoking cigarettes may contribute to greater instability in depressive symptoms. Indeed, there is evidence suggesting that cigarette smoking is associated with greater day-to-day variation in internalizing symptoms and mood (Bares et al., 2018).
No group differences were found at the between-family level. At the within-family level, increases in maternal depression at 9-months were only associated with less child engagement at 9-months for the non-smoking group. It is possible that the greater stability of depression for non-smoking mothers may lead their children to be more sensitive to changes in maternal depression. No other within-family differences were found. It seems that in our diverse, low-income sample, depression was associated with maternal behavior similarly across the groups. It is possible that in such a socio-demographically similar group, other risk factors (e.g., food instability, community violence) may influence the relationship between maternal depression and child engagement more strongly than MSDP. Furthermore, the greater day-to-day variation in maternal symptomatology associated with tobacco-use (Bares et al., 2018) may have limited detection of within-family change for the MSDP group. Future studies incorporating maternal smoking in the postnatal period may yield different results.
In our preliminary analyses, we found significant differences in parenting and child engagement for boys and girls. Mothers of boys were less sensitive at 16-months and, in turn, boys were less engaged at 16 and 24-months. Given previous findings that boys are more sensitive to maternal depression than girls (Park et al., 2018), there may be more pronounced effects in families of boys. Future studies may examine whether these transactional processes operate differently for boys and girls.
Limitations and Future Directions
The current study is among the first to examine transactional dynamics between mother-child dyads within the context of MSDP, but was not without limitations. First, our study did not include measures of child behavior beyond 24-months of age, limiting our ability to make predictions of child outcomes and to examine the intergenerational transmission of psychopathology. Second, our study did not include a measure of mothers’ postnatal smoking. Although strongly correlated with prenatal smoking (Shisler et al., 2016), change in postnatal smoking may influence the relationship between maternal depression and child engagement via sensitive parenting (i.e., increases in maternal irritability). Future research should examine how day-to-day variation in substance use may affect mother-child interactions. Given the significant sex differences found in our study, it may also be useful to investigate how MSDP and sensitive parenting affect boys and girls differently.
Despite these limitations, this study highlights the transactional nature of mother-child interactions and is one of the first to examine these processes differentiating within- and between-family effects in the context of MSDP, using a low-income and diverse sample. Additional strengths included the multi-method assessments of MSDP and observational assessments of maternal and child behavior. These results increase our understanding of transactional processes in the first two years of life and within time-direct associations between increases in maternal depression and decreases in child engagement.
Footnotes
We have no conflicts of interests to disclose.
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