Table 3.
Logistic regression analyses examining the association between preterm birth or low birth weight, active maternal smoking, total smoke exposure and Spielberger State-Trait Anxiety Inventory (complete case and imputed, without interaction, including interaction)
| Characteristics | Preterm Birth | Low Birth Weight | ||||
|---|---|---|---|---|---|---|
| Adjusted OR (95%CI)a | Adjusted OR (95%CI)b | |||||
| Imputed without interaction |
Complete cases with interaction |
Imputed with interaction |
Imputed without interaction |
Complete case with interaction |
Imputed with interaction |
|
| Active maternal smoke exposure |
1.57 (1.02–2.40) |
1.54 (0.30–7.87) |
1.37 (0.73–2.57) |
1.16 (0.64–2.12) |
0.58 (0.23–1.49) |
0.70 (0.32–1.52) |
| Spielberger State Anxiety Inventory score (STAI) |
1.03 (1.02–1.05) |
1.04 (1.02–1.05) |
1.03 (1.02–1.05) |
1.03 (1.01–1.05) |
1.02 (1.00-1.04) |
1.02 (1.00-1.04) |
| Interaction: Active maternal smoke exposure and STAI score |
1.00 (0.96–1.04) |
1.00 (0.99–1.02) |
1.02 (0.999–1.04) |
1.02 (1.00-1.03)* |
||
| Total smoke exposure |
1.52 (1.04–2.23) |
3.22 (0.93–11.20) |
2.31 (0.78–6.82) |
1.51 (0.92–2.48) |
1.80 (0.40–8.11) |
1.47 (0.42–5.11) |
| Spielberger State Anxiety Inventory score (STAI) |
1.03 (1.02–1.05) |
1.04 (1.02–1.06) |
1.04 (1.02–1.05) |
1.03 (1.01–1.05) |
1.03 (1.00-1.05) |
1.03 (1.00-1.05) |
| Interaction: Total smoke exposure and STAI score |
0.98 (0.94–1.01) |
0.99 (0.96–1.02) |
0.99 (0.95–1.03) |
1.00 (0.97–1.04) |
||
OR: odds ratio; 95% CI: 95% confidence interval
a Adjusted for maternal age, body mass index, education, income, parity
b Adjusted for maternal age, body mass index, education, income, parity, preterm birth
* p = 0.06