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Table 5 SGA vs. non-SGA: the subgroup analysis

From: What is the impact of birth weight corrected for gestational age on later onset asthma: a meta-analysis

Stratification Number of studies I2 Model OR (95% CI)
Overall 12 87.80% Random 1.07 (0.94–1.21)
Study design Case–control 1 Random 0.87 (0.56–1.35)
Cohort 5 76.60% Random 1.05 (0.86–1.29)
Cross-sectional 6 88.80% Random 1.08 (0.91–1.29)
Study site Europe 5 91.20% Random 0.94 (0.69–1.28)
North America 4 65.10% Random 1.06 (0.88–1.27)
Asia 3 0% Random 1.16 (1.08–1.25)*
Sample size  < 5000 3 30.7% Random 0.80 (0.54–1.18)
5000–10,000 1 Random 0.32 (0.20–0.52)*
10,000–50,000 3 43.20% Random 1.10 (0.98–1.25)
50,000–100,000 3 0% Random 1.15 (1.07–1.24)*
 > 100,000 2 0% Random 1.41 (1.33–1.50)*
Asthma definition Questionnaire 5 87.50% Random 0.72 (0.43–1.20)
Medical record 7 88.70% Random 1.19 (1.04–1.35)*
  1. SGA small for gestational age
  2. *P < 0.05