From: Parental risk factors and anorectal malformations: systematic review and meta-analysis
 |  | Maternal overweight/obesity |  |  |
---|---|---|---|---|
Ref. |    First author, year | Exposure | OR [95% CI] | Adjustment/matching factors |
[26] |    Blomberg, 2010 | BMI < 18.5 BMI 18.5 - 24.9 BMI 25 - 29.9 BMI ≥30 | 1.22 [0.63, 2.13] 1.00 Reference 1.21 [0.98, 1.51] 1.87 [1.42, 2.47] | Adjusted for: maternal age, parity, smoking in early pregnancy and year of birth using the Mantel-Haenszel method |
 |  | BMI 30 - 34.9 BMI 35 - 39.9 BMI ≥40 | 1.77 [1.29, 2.44] 1.48 [0.74, 2.64] 3.72 [1.70, 7.07] | Adjusted for: see above |
[39] |    van Rooij, 2010** | BMI 25 - 29.9 BMI ≥30 | 1.8 [1.1, 3.0] 1.4 [0.6, 3.2] | N/A* |
[40] |    Waller, 2007 | BMI < 18.5 BMI 25 - 29.9 BMI ≥30 | 0.81 [0.48, 1.36] 1.19 [0.92, 1.55] 1.46 [1.10, 1.95] | Adjusted for: maternal age, ethnicity, education, parity, smoking in the month prior to conception and supplemental folic acid intake in the month prior to conception |