Table 2. Odds ratios for maternal body mass index and weight gain in relation to risk of macrosomia.
| Infant Birth Weight | ||||
|---|---|---|---|---|
| Macrosomia | Crude OR | Adjusted OR | ||
| Variable | % | Estimate [95% CI] | Estimate [95% CI] | |
| Body Mass Index* | ||||
| Overweight (n=225) | 12.9 | 1.7 [1.0,2.8] | 1.8 [1.0,312] | |
| Normal (n=492) | 7.5 | reference | reference | |
| Underweight (n=98) | 8.2 | 1.2 [0.5,2.7] | 1.2 [0.5,2.8] | |
| Weight Gain | ||||
| Excess (n=347) | 11.9 | 1.5 [0.9,2.7] | 1.5 0.7,2.5 | |
| Normal (n=266)** | 7.8 | reference | reference | |
| Low (n=202) | 5.8 | 0.8 [0.4,1.7] | 1.0 [0.4,1.9] | |
| BMI and Weight Gain | ||||
| Overweight/Excess (n=131) | 17.3 | 2.4 [1.2,4.8] | 2.6 [1.2,5.4] | |
| Overweight/Normal (n=51) | 6.3 | 0.8 [0.2,2.7] | } | 1.1 [0.4–3.1] |
| Overweight/Low (n=43) | 9.5 | 1.2 [0.4,3.8] | ||
| Normal/Excess (n=193) | 8.9 | 1.1 [0.5,2.3] | 1.1 [0.5,2.4] | |
| Normal/Normal (n=176) | 8.2 | reference | reference | |
| Normal/Low (n=123) | 5.6 | 0.7 [0.3,1.8] | 0.9 [0.3,2.6] | |
| Underweight/Excess (n=23) | 13.0 | 1.7 [0.4,6.4] | & | |
| Underweight/Normal (n=39) | 7.9 | 1.0 [0.3,3.5] | } | 0.9 0.3-2.7 |
| Underweight/Low (n=36) | 6.1 | 0.7 [0.2,3.3] | ||
*
Body mass index, >26 kg/m2 for overweight; 19.8–26 kg/m2 for normal weight; <19.8 kg/m2 for underweight.
**
Normal weight gain, 11–16 kgs for normal weight; 7–11 kgs for overweight; 13–18 kgs for underweight.
&
Adjusted odds ratio not calculated because less than four macrosomia subjects.