Table 1 Characteristics of the studies included in the analysis
From: Effect of low birth weight on childhood asthma: a meta-analysis
Study (reference) | Country of study, n. | Primary exposure measure (birth weight, g) | Effect size (95% CI) | Age at follow up (y) | Quality score | Adjusted |
|---|---|---|---|---|---|---|
Davidson [16] | England, n = 248612 | 1000-2999 vs 3000-3999 | OR 1.2 (1.1-1.3) | 2-10 | 8.0 | Yes |
Chatkin [15] | Brazil, n = 981 | < 2500 vs >2500 | RR 1.32 (0.8-1.96) | 4-5 | 5.5 | Yes |
Nepomnyaschy [19] | United States, n = 1803 | < 2500 vs >2500 | RR 1.57 (1.23-1.99) | < 3 | 6.0 | No |
Fergusson [17] | New Zealand, n = 798 | < 2500 vs 2500-4000 | RR 0.97 (0.6-1.58) | 16 | 5.5 | No |
Lu [18] | Taiwan, n = 69979 | < 3000 vs 3000-4000 | RR 1.17 (1.09-1.27) | 13-15 | 7.0 | No |
Yuan [26] | Denmark, n = 10190 | < 2500 vs 2500-4499 | RR 0.9 (0.43-1.89) | < 12 | 6.5 | No |
Wjst [24] | German, n = 2337 | < 2500 vs >2500 | RR 1.47 (0.64-3.36) | 5-14 | 5.0 | No |
Remes [21] | Finland, n = 4141 | ≤ 2490 vs 2500-4190 | RR 1.31 (0.85-2) | 16 | 7.0 | No |
Yang [25] | United States, n = 3933 | < 2500 vs >2500 | RR 1.25 (0.73-2.15) | 6-7 | 6.5 | No |
Rasanen [20] | Finland, n = 4502 | < 2500 vs >2500 | RR 0.97 (0.71-1.31) | 16 | 6.0 | No |
To [23] | Canada, n = 671402 | < 2500 vs 2500-4500 | RR 1.18 (1.13-1.22) | 6 | 8.5 | Yes |
Sin [22] | Canada, n = 83595 | < 2500 vs 2500-4500 | RR 1 (0.9-1.11) | 10 | 7.5 | Yes |
Bjerg [14] | Sweden, n = 3430 | < 2500 vs >2500 | OR 2.6 (1.2-5.4) | 7-8 | 6.0 | Yes |