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Table 3 Summary of the 6 meta-analyses

From: Tooth loss and oral health-related quality of life: a systematic review and meta-analysis

Comparison Summary effect 95% CI p-value for heterogeneity test Model used
Meta analysis 1 [25, 43] Continuous data (difference in mean OHIP total scores) Total n = 12,965 Reference group: 25-32 teeth
1-8 teeth 3.37 1.37-5.38 <0.001 random effect
9-16 teeth 3.08 1.37-4.80 <0.001 random effect
17-20 teeth 1.89 -0.03-3.82 <0.001 random effect
21-24 teeth 1.05 0.07-2.02 <0.001 random effect
Meta analysis 2 [25, 26] Dichotomized data (Odds ratio for having an OHIP impact) Total n = 6821 Reference group: complete dentition or ≥ 25 teeth
Incomplete or < 25 teeth 3.45 2.93-4.05 0.975 fixed effect
Meta analysis 3 [5, 24, 45] Dichotomized data (Odds ratio for having an OIDP impact) Total n = 2204 Reference group ≥ 21 teeth
≤ 10 teeth 2.01 1.43-2.83 0.962 fixed effect
>10 and <21 teeth 1.63 1.23-2.17 0.794 fixed effect
Meta analysis 4 [5, 45] Dichotomized data (Odds ratio for having an OIDP impact) Total n = 1184 Reference groups 9-16 NOPs/4-8 POPs/no UAS
0-8 NOPs 1.99 1.39-2.86 0.279 fixed effect
0-3 POPs 1.66 1.16-2.37 0.808 fixed effect
UAS 1.82 0.68-4.87 0.025 random effect
Meta analysis 5 [38, 46] Continuous data (difference in mean GOHAI total scores) Total n = 435 Reference group: 20-32 teeth
0-19 teeth 9.78 7.38-12.18 0.157 fixed effect
Meta analysis 6 [31, 35] Continuous data (difference in mean OHQoL-UK total scores) Total n = 2738 Reference group: 20-32 teeth
0-19 teeth 4.56 3.67-5.44 0.912 fixed effect