Unadjusted and adjusted relationships between BMI, age, other variables and change in AHI (n=105)
| Variable | Unadjusted change in AHI, events/h (95% CI) | p Value | Adjusted change in AHI, events/h (95% CI) | p Value |
|---|---|---|---|---|
| Baseline BMI, 5 kg/m2 | 1.11 (0.43 to 1.80) | 0.002 | 1.43 (0.70 to 2.16) | 0.0002 |
| Third trimester BMI, 5 kg/m2 | 1.13 (0.34 to 1.92) | 0.016 | ||
| Baseline BMI | 0.070* | |||
| Normal | Ref | – | ||
| Overweight | 1.76 (−1.00 to 4.52) | 0.211 | ||
| Obese I | 2.11 (−0.65 to 4.87) | 0.134 | ||
| Obese II/III | 3.77 (1.01 to 6.54) | 0.007 | ||
| Gestational weight gain (kg) | −0.23 (−0.42 to −0.05) | 0.012 | ||
| First trimester neck circumference, cm | 0.33 (−0.00 to 0.67) | 0.052 | ||
| Third trimester neck circumference, cm | 0.44 (0.08 to 0.80) | 0.016 | ||
| Age, 10 years | 1.03 (−0.37 to 2.44) | 0.149 | 1.32 (−0.05 to 2.68) | 0.059 |
| Baseline AHI | −0.09 (−0.43 to 0.25) | 0.604 | −0.42 (−0.77 to −0.06) | 0.022 |
| Third trimester ESS | 0.19 (−0.07 to 0.45) | 0.150 | ||
| Change in ESS | 0.02 (−0.07 to 0.37) | 0.186 | ||
| Nulliparity | −0.01 (−2.06 to 2.03) | 0.990 | ||
| Total parity | 0.39 (−0.12 to 0.90) | 0.134 | ||
| White and other ethnicity (ref African-Am) | −1.91 (−4.25 to 0.42) | 0.108 |
The bold numbers are statistically significant at the <0.05 level.
*Omnibus p value for BMI group differences in the logistic regression model. Pairwise comparisons for subgroups are reported in italics for individual BMI groups, compared with normal BMI.
AHI, Apnoea-Hypopnoea Index; BMI, Body Mass Index.