Table 3.
Unadjusted and Adjusted Odds Ratios of Sociodemographic Determinants of Accurate Recall.
| Logistic regression analysis | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Crude | Adjusted model 1a | Adjusted model 2b | |||||||
| Odds ratio | 90% CI | Wald p value | Odds ratio | 95% CI | Wald p value | Odds ratio | 95% CI | Wald p value | |
| Maternal characteristics | |||||||||
| Maternal age at 6 years (years) | |||||||||
| 23 to < 30 (ref) | 1 | — | 1 | — | |||||
| 30 to < 35 | 0.99 | [0.6, 1.7] | 1.05 | [0.5, 2.1] | |||||
| 35 to < 40 | 1.01 | [0.6, 1.7] | 0.92 | [0.4, 1.9] | |||||
| ≥ 40 | 0.76 | [0.5, 1.3] | .473 | 0.69 | [0.3, 1.5] | .352 | |||
| Employment | |||||||||
| Unemployed (ref) | 1 | — | 1 | — | |||||
| Employed | 1.08 | [0.8, 1.4] | .668 | 1.01 | [0.7, 1.5] | .968 | |||
| Marital status | |||||||||
| Married (ref) | 1 | — | 1 | — | |||||
| Unmarried | 1.18 | [0.8, 1.8] | .504 | 1.12 | [0.6, 2.0] | .700 | |||
| Education | |||||||||
| Non-HS graduate (ref) | 1 | — | 1 | — | |||||
| HS graduate | 0.65 | [0.1, 3.1] | 0.50 | [0.1, 3.1] | |||||
| Some college | 0.64 | [0.1, 2.9] | 0.49 | [0.1, 3.4] | |||||
| College and above | 0.85 | [0.2, 3.9] | .377 | 0.58 | [0.1, 4.1] | .748 | |||
| Race/ethnicity | |||||||||
| White (ref) | 1 | — | 1 | — | |||||
| Black | 0.97 | [0.5, 2.0] | 0.91 | [0.4, 2.4] | |||||
| Hispanic | 0.68 | [0.4, 1.2] | 0.62 | [0.3, 1.2] | |||||
| Other | 0.98 | [0.6, 1.7] | .718 | 1.08 | [0.5, 2.2] | .583 | |||
| Poverty index | |||||||||
| Poorest (ref) | 1 | — | 1 | — | |||||
| Somewhat poor | 0.94 | [0.7, 1.3] | 0.91 | [0.6, 1.5] | |||||
| Not poor | 1.40 | [0.9, 2.1] | .115 | 1.12 | [0.6, 2.1] | .604 | |||
| WIC participation | |||||||||
| Yes (ref) | 1 | — | 1 | — | |||||
| No | 1.18 | [0.9, 1.6] | .328 | 1.12 | [0.7, 1.7] | .607 | |||
| Smoking | |||||||||
| No (ref) | 1 | — | 1 | — | |||||
| Yes | 0.60 | [0.4, 0.9] | .032 | 0.57 | [0.3, 1.0] | .040 | .57 | .026 | |
| Parity | |||||||||
| Primiparous (ref) | 1 | — | 1 | — | 1 | — | |||
| Multiparous | 0.54 | [0.4, 0.7] | .0007 | 0.58 | [0.4, 0.9] | .010 | .52 | [0.4, 0.8] | .0005 |
| Infant characteristics | |||||||||
| Gender | |||||||||
| Boy (ref) | 1 | — | 1 | — | |||||
| Girl | 0.93 | [0.7, 1.2] | .670 | 0.9 | [0.7, 1.3] | .544 | |||
| Birth weight (lb) | |||||||||
| ≤ 8.8c (ref) | 1 | — | 1 | — | |||||
| > 8.8d | 1.33 | [0.9, 2.0] | .227 | 1.27 | [0.8, 2.1] | .342 | |||
| HL GOF test: 0.67 | HL GOF test: 1.00 | ||||||||
Note. Accurate recall was defined as recalled breastfeeding duration to within a month of the Infant Feeding Practices Study II breastfeeding duration. CI = confidence interval; HL GOF test = Hosmer–Lemeshow goodness-of-fit test (p value); HS = high school; ref = reference; WIC = Special Supplemental Nutrition Program for Women, Infants, and Children.
a
Model 1: fully adjusted model.
b
Model 2: reduced model excludes variables nonsignificant at p > .05 and nonconfounders as per the 10% rule.
c
Normal birth weight.
d
Above normal birth weight.