Table 3.
Pregnancy rates in various categories of weight and BMI from the included individual studies
| Study and sample size | Hong Kong 1993 (410) | WHO 1998 (974) | WHO 2002 (2695) | Nigeria 2010 (2794) | Total pooled data (6873) |
|---|---|---|---|---|---|
| Number of pregnancies | 12 | 10 | 44 | 17 | 83 |
| Pregnancy rate | 2.9 (1.3–4.6) | 1.0 (0.4–1.7) | 1.6 (1.2–2.1) | 0.6 (0.3–0.9) | 1.208 (0.95–1.47) |
| Pregnancies (N,%) by weight (kg) group | |||||
| a. Weight < − 75 | 11/408 (2.7%) | 10/901 (1.1%) | 44/2609 (1.7%) | 14/2384 (0.6%) | 79/6302 (1.3%) |
| b. Weight [75–80) | 0 | 0/35 (0.0%) | 0/35 (0.0%) | 1/198 (0.5%) | 1/268 (0.4%) |
| c. Weight [80 ++) | 0/1 (0.0%) | 0/38 (0.0%) | 0/51 (0.0%) | 2/207 (1.0%) | 2/297 (0.7%) |
| Pregnancies (N, %) by BMI (kg/m2) group | |||||
| a. BMI (<− 25) | 10/378 (2.6%) | 10/821 (1.2%) | 42/2469 (1.7%) | 6/1760 (0.3%) | 68/5428 (1.3%) |
| b. BMI [25–30) | 0/20 (0.0%) | 0/127 (0.0%) | 2/194 (1.0%) | 5/799 (0.6%) | 7/1140 (0.6%) |
| c. BMI [30 ++) | 0/7 (0.0%) | 0/26 (0.0%) | 0/32 (0.0%) | 6/230 (2.6%) | 6/295 (2.0%) |