Table 3.
No. of study | Summary OR 95% CI | I 2 (%) | P* | P** a | |
---|---|---|---|---|---|
Cardiovascular‐related malformation | 12 | 1.36 (1.06–1.74) | 64.4 | 0.01 | |
Atrial and/or ventricular septal defect | 8 | 1.36 (1.06–1.76) | 62.2 | <0.01 | |
Cardiac malformation | 5 | 1.20 (0.94–1.53) | 59.2 | 0.04 | |
Nervous system | 5 | 1.39 (0.83–2.32) | 0.0 | 0.95 | |
Digestive system | 5 | 1.23 (0.76–1.98) | 0.0 | 0.81 | |
Eye, ear, face and neck | 3 | 1.08 (0.33–3.55) | 32.1 | 0.22 | |
Urogenital system | 5 | 1.03 (0.73–1.46) | 0.0 | 0.76 | |
Musuloskeletal system | 5 | 0.97 (0.69–1.36) | 0.0 | 0.72 | |
Subgroup analysis a | |||||
Geographic location | 0.53 | ||||
North America | 3 | 1.26 (1.06–1.49) | 0.0 | 0.91 | |
Europe | 7 | 1.35 (0.88–2.06) | 77.2 | <0.01 | |
Others | 2 | 2.83 (0.66–12.08) | 52.8 | 0.15 | |
Adjustment for potential confounders | |||||
Age | 0.68 | ||||
Yes | 8 | 1.32 (0.91–1.91) | 73.4 | <0.01 | |
No | 4 | 1.43 (0.98–2.07) | 30.6 | 0.23 | |
Socioeconomic status | 0.32 | ||||
Yes | 2 | 1.84 (0.80–4.24) | 78.8 | 0.03 | |
No | 10 | 1.23 (0.98–1.56) | 51.9 | 0.03 | |
Smoking or alcohol drinking | 0.88 | ||||
Yes | 6 | 1.36 (0.87–2.11) | 81.0 | <0.01 | |
No | 6 | 1.30 (1.11–1.53) | 0.0 | 0.48 | |
Pregnancy body mass index | 0.86 | ||||
Yes | 1 | 1.52 (0.78–2.96) | N/A | N/A | |
No | 11 | 1.35 (1.03–1.75) | 67.3 | <0.01 | |
Pregnancy complications | 0.21 | ||||
Yes | 4 | 1.10 (0.87–1.38) | 14.3 | 0.32 | |
No | 8 | 1.62 (1.09–2.42) | 70.4 | <0.01 | |
Parity | 0.77 | ||||
Yes | 6 | 1.32 (0.81–2.15) | 80.7 | <0.01 | |
No | 6 | 1.31 (1.12–1.53) | 0.0 | 0.46 |
CI, confidence interval; N/A, not available; OR, odd ratio
P* for heterogeneity within each subgroup
P** for heterogeneity between subgroups with metaregression analysis
Subgroup analyses were only carried out for cardiovascular‐related malformation