Table 3 Covariate-Adjusted Differences in Mean Gestational Age (Days) at Delivery Associated with Frequency of Hair Product Use During Pregnancy (n = 154)
Hair Oil | Hair Lotion | Leave-In Conditioners | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Model Timepoint | Model Aa | Model Bb | Model Aa | Model Bb | Model Aa | Model Bb | ||||
Frequency | n | β (95% CI) | n | β (95% CI) | n | β (95% CI) | ||||
Visit 1 | 134 | 136 | 134 | |||||||
Daily | 7 | -4.9 (-15.1, 5.4) | -5.8 (-16.3, 4.7) | 4 | 3.9 (-9.7, 17.4) | 3.1 (-10.7, 16.9) | 7 | 5.1 (-5.3, 15.4) | 5.1 (-5.3, 15.6) | |
< Daily | 18 | 1.0 (-5.7, 7.6) | 0.5 (-6.7, 7.7) | 17 | -3.2 (-10.0, 3.5) | -3.8 (-10.7, 3.2) | 20 | 1.7 (-4.7, 8.1) | 1.7 (-4.8, 8.2) | |
Never | 109 | 0 (ref) | 0 (ref) | 115 | 0 (ref) | 0 (ref) | 107 | 0 (ref) | 0 (ref) | |
Visit 2 | 136 | 136 | 137 | |||||||
Daily | 10 | 0.04 (-8.7, 8.8) | -0.1 (-9.2, 9.0) | 10 | -0.8 (-9.7, 8.0) | -1.1 (-10.3, 8.0) | 6 | -5.0 (-12.9, 2.8) | -4.1 (-12.2, 4.0) | |
< Daily | 19 | -2.3 (-8.9, 4.3) | -2.2 (-8.9, 4.6) | 17 | -0.7 (-7.6, 6.2) | -0.7 (-7.7, 6.3) | 20 | -0.4 (-4.5, 3.8) | 0.0 (-4.2, 4.3) | |
Never | 107 | 0 (ref) | 0 (ref) | 109 | 0 (ref) | 0 (ref) | 106 | 0 (ref) | 0 (ref) | |
Visit 3 | 135 | 134 | 136 | |||||||
Daily | 14 | -1.1 (-6.4, 4.2) | -1.0 (-6.7, 4.6) | 9 | 1.4 (-5.3, 8.0) | 1.7 (-5.4, 8.7) | 5 | -2.4 (-11.0, 6.2) | -2.5 (-11.5, 6.5) | |
< Daily | 12 | -1.3 (-6.9, 4.3) | -1.3 (-7.0, 4.5) | 12 | -2.4 (-8.0, 3.1) | -2.3 (-8.0, 3.5) | 20 | -2.4 (-6.9, 2.0) | -2.5 (-7.1, 2.2) | |
Never | 109 | 0 (ref) | 0 (ref) | 113 | 0 (ref) | 0 (ref) | 111 | 0 (ref) | 0 (ref) | |
Visit 4 | 129 | 127 | 129 | |||||||
Daily | 8 | -7.9 (-14.3, -1.5) | -8.3 (-14.9, -1.6) | 3 | -2.1 (-12.4, 8.2) | -1.8 (-12.6, 9.0) | 6 | -2.2 (-9.6, 5.2) | -2.1 (-9.6, 5.4) | |
< Daily | 18 | 0.9 (-3.5, 5.3) | 0.9 (-3.8, 5.7) | 12 | -2.8 (-8.2, 2.6) | -3.0 (-9.0, 3.0) | 17 | -0.4 (-5.0, 4.2) | -0.4 (-5.0, 4.3) | |
Never | 103 | 0 (ref) | 0 (ref) | 112 | 0 (ref) | 0 (ref) | 106 | 0 (ref) | 0 (ref) | |