Variables | Number of studies | Prevalence (95% CI) | Heterogeneity | |
---|---|---|---|---|
I2 | P-Value | |||
Geographical region | ||||
 North | 4 | 62% (42–81) | 99.4% | 0.000 |
 South | 6 | 48% (20–75) | 99.7% | 0.000 |
 West | 7 | 61% (41–81) | 99.5% | 0.000 |
 East | 5 | 60% (52–67) | 95.3% | 0.000 |
 Center | 9 | 47% (24–70) | 99.7% | 0.000 |
Sample size | ||||
 ≤ 500 | 20 | 52% (35–68) | 99.7% | 0.000 |
 > 500 | 12 | 56% (42–70) | 99.8% | 0.000 |
Education before pregnancy | ||||
 Yes | 6 | 55% (39–71) | 98.4% | 0.000 |
 No | 6 | 50% (35–64) | 88.5% | 0.000 |
Maternal employment | ||||
 Unemployed | 6 | 58% (46–69) | 95.8% | 0.000 |
 Employed | 6 | 55% (37–73) | 92.9% | 0.000 |
Education level | 0.000 | |||
 Under diploma | 6 | 58% (51–64) | 52.4% | 0.000 |
 Upper diploma | 6 | 56% (42–69) | 97.3% | 0.000 |
Type of delivery | 0.000 | |||
 Vagina | 5 | 58% (43–74) | 97.1% | 0.000 |
 Cesarian | 5 | 49% (34–64) | 95.7% | 0.000 |
Gender of child | 0.000 | |||
 Girl | 4 | 60% (40–80) | 97.6% | 0.000 |
 Boy | 4 | 59% (41–78) | 96.8% | 0.000 |
Birth weight | 0.000 | |||
 Under 2500 g | 3 | 62% (54–70) | 0% | 0.000 |
 Upper 2500 g | 3 | 60% (40–80) | 97.8% | 0.000 |
Mother with history of diseases (Diabetes, hypertension, …) | 0.000 | |||
 Yes | 2 | 44% (20–68) | 86.6% | 0.000 |
 No | 2 | 50% (24–76) | 85.7% | 0.000 |
Location of delivery | 0.000 | |||
 Govermental | 2 | 69% (45–93) | 97.5% | 0.000 |
 Private | 2 | 51% (34–71) | 98.6% | 0.000 |