Figure 1
Pooled odds ratios, their 95% confidence intervals, Tau-squared and Higgins’ I2values for the association between chronic hepatitis B infection during pregnancy and the occurrence of gestational diabetes mellitus using a random-effects model based sequential algorithm. OR: odds ratio; ORL: 95% lower confidence limit of OR; ORH: 95% higher confidence limit of OR; Notes: In each step of the analysis, one study was removed out of: (a) the original fourteen studies (Step 1); (b) the remaining thirteen studies after the exclusion of the Lao 2003 (Step 2); (c) the remaining twelve studies after the exclusion of Lao 2003 and Saleh-Gargari 2009 (Step 3); (d) the remaining eleven studies after the exclusion of Lao 2003, Saleh-Gargari 2009 and Tse 2003 (Step 4). The arrows point to the studies whose removal minimises the Higgins’ I2 value. The blue, green and orange hollow circles denote the pooled ORa, 95% ORL and ORH, respectively, and the red multiple signs denote the Tau-squared values.