Table 2 Subgroups analysis based on birth weight and age at assessment.
From: A gradient relationship between low birth weight and IQ: A meta-analysis
No. of study group | WMD | 95% CI | Z test P value | I 2 (%) | Q test P value | Egg’s test P value | |
|---|---|---|---|---|---|---|---|
birth weight | |||||||
<1000 | 20 | 13.95 | 11.71–16.20 | <0.001 | 81.7 | <0.001 | 0.739 |
1000–1499 | 35 | 9.85 | 8.43–11.28 | <0.001 | 70.6 | <0.001 | 0.764 |
1500–2499 | 11 | 6.83 | 4.76–8.89 | <0.001 | 43.7 | 0.06 | 0.382 |
age | |||||||
<10 | 36 | 10.58 | 8.87–12.30 | <0.001 | 83.5 | <0.001 | 0.278 |
10~18 | 17 | 9.82 | 7.88–11.75 | <0.001 | 66.4 | <0.001 | 0.151 |
≥18 | 8 | 11.28 | 8.42–11.68 | <0.001 | 76.8 | <0.001 | 0.588 |
social determinants | |||||||
matched | 39 | 9.90 | 8.42–11.39 | <0.001 | 76.8 | <0.001 | 0.172 |
non-matched | 22 | 11.42 | 9.31–13.53 | <0.001 | 84.4 | <0.001 | 0.409 |
