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. 2015 Aug 8;6(4):279. doi: 10.1016/j.phrp.2015.07.004
Studies included No. of Studies OR 95% CI Heterogeneity
 Egger's test (p for bias)
p I2 (%)
Type of study design
 Hospital CC 15 1.01 0.89 to 1.13 0.171 25.7 0.994
 Population CC 11 1.19 0.99 to 1.44 0.004 61.3 0.212
 Nested CC 11 0.92 0.83 to 1.03 0.377 7.0 0.160
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