Stratification | Study Characteristics (Number of studies) | I2 (%) | Summary Effect Estimate for pooled adjusted data [95% CI] | P-value |
---|---|---|---|---|
Population | All studies (15) [12, 18, 25,26,27,28,29,30,31,32,33,34,35,36,37] | 78 | 1.24 [1.09, 1.41] | 0.001 |
Study sizea | 82 | 1.14 [1.02, 1.38] | 0.04 | |
67 | 1.33 [1.11, 1.59] | 0.002 | ||
Geographical Location | 63 | 1.35 [1.15, 1.57] | 0.0001 | |
81 | 1.06 [0.87, 1.28] | 0.56 | ||
Year of Publication | 84 | 1.34 [0.58, 3.09] | 0.49 | |
2000 – 2009 (13) [18, 25,26,27,28,29,30,31,32,33, 35,36,37] | 60 | 1.25 [1.12, 1.41] | 0.0002 | |
Method of IM Assessment | 2 | 1.48 [1.25, 1.75] | 0.00001 | |
76 | 1.12 [0.98, 1.29] | 0.11 | ||
Home Inspection (1) [30] | NA | 1.66 [0.85, 3.21] | 0.14 | |
Method of diagnosis | NA | 1.60 [1.28, 2.01] |  < 0.0001 | |
Self-reported (13) [12, 25,26,27, 29,30,31,32,33,34,35,36,37] | 76 | 1.19 [1.04, 1.35] | 0.009 | |
Study Quality | 59 | 1.31 [1.12, 1.55] | 0.001 | |
75 | 1.17 [0.99, 1.37] | 0.06 |