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Table 3 Sensitivity analysis for heterogeneity

From: A meta-analysis of MMP-9 promoter −1562 C/T polymorphism on susceptibility of chronic periodontitis

MMP-9 (−1562 C/T) Study majorly contributed to the heterogeneity Heterogeneity after excluding the study Pooled ORs of the remaining studies
Ph I 2, % OR 95 % CI, P
Total
 T versus C Li et al.’s study 0.000 85.2 0.56 (0.33, 0.97), 0.040
 CT versus CC Li et al.’s study 0.013 65.4 0.62 (0.39, 0.98), 0.040
Dominant genetic model Li et al.’s study 0.000 82.9 0.54 (0.29, 1.01), 0.054
Ethnicity
Caucasian
 T versus C Keles et al.’s study 0.440 0.0 0.75 (0.54, 1.04), 0.080
Severity of chronic periodontitis
Severe
 T versus C Holla et al.’s study 0.003 75.2 0.37 (0.25, 0.54), 0.000
 CT versus CC Holla et al.’s study 0.108 47.3 0.36 (0.28, 0.47), 0.000
 Dominant genetic mode Holla et al.’s study 0.003 75.2 0.32 (0.19, 0.53), 0.000
  1. MMP-9: matrix metalloproteinase-9; dominant genetic model: TT + CT versus CC; Ph: the P value of heterogeneity; OR: odds ratio; CI: confidence interval