Table 2.
Linear mixed regression analysis: Association between prenatal tobacco exposure and (A) average length/height z-score over 60 months (B) relative length/height growth rate of offspring
| (A) Average length/height z-score | (B) Relative growth rate (SDs/year) b |
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|---|---|---|---|---|---|
| birth to 60 monthsa | birth to 60 months | 0-12 months | 12-36 months | 36-60 months | |
| Maternal plasma cotinine (ng/mL) and ETS status |
|||||
| <0.17, ETS (-) | Reference | Reference | Reference | Reference | Reference |
| <0.17, ETS (+) | -0.08 (-0.21 ,0.05) | 0.03 (<0.01 ,0.06)* | 0.08 (-0.11 ,0.27) | 0.03 (-0.03 ,0.09) | 0.01 (-0.02 ,0.04) |
| 0.17-13.99 | -0.01 (-0.17 ,0.16) | 0.02 (-0.02 ,0.05) | -0.05 (-0.29 ,0.19) | 0.05 (-0.02 ,0.12) | 0.02 (-0.02 ,0.05) |
| 14 and Above | -0.35 (-0.64 ,-0.06)* | 0.06 (-0.01 ,0.14) | 0.43 (-0.02 ,0.87) | -0.05 (-0.20 ,0.09) | 0.03 (-0.04 ,0.11) |
p value <0.05
Models adjusted for prenatal tobacco exposure grouping (Groups 1 to 4 based on maternal plasma cotinine and ETS status), ethnicity, maternal age at delivery, maternal education level, parity, 1st trimester maternal BMI, maternal height, gestational age at birth and age of visit, with random intercept and random slope model.
Models adjusted for prenatal tobacco exposure grouping (Groups 1 to 4 based on maternal plasma cotinine and ETS status), ethnicity, maternal age at delivery, maternal education level, parity, 1st trimester maternal BMI, maternal height and gestational age at birth, age of visit and interaction of ETS*age of visit with random intercept and random slope model.
ETS: Environmental tobacco smoke exposure