Effects of Secondhand Smoke Exposure on the Health and Development of African American Premature Infants

Table 4

Effects of secondhand smoke exposure and covariates from mixed model analyses for Bayley MDI and PDI and the general linear model for PLS-4.

Variables	Estimate (SE)	DF	𝑡 value	pr>|𝑡|
Development
MDI
Household smoker versus no smoker
Mean change from 12 to 24 months	−0.34 (3.01)	149	−0.11	0.9099
Maternal smoker versus no maternal smoker
Mean change from 12 to 24 months	−3.49 (3.52)	153	−0.99	0.3238
PDI
Household smoker versus no smoker
Mean change from 12 to 24 months	−0.92 (5.82)	149	−0.16	0.8745
Maternal smoker versus no maternal smoker
Mean change from 12 to 24 months	−7.72 (6.93)	149	−1.12	0.2665
PLS-4
Household smoker versus no smoker at 24 months	−3.15 (2.49)	120	−1.26	0.2086
Maternal smoker versus no maternal smoker at 24 Months	−1.22 (2.79)	120	−0.44	0.6633

*indicates that P values are significant at the  .05 level.