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Table 3 Results of Welch t test comparing studies' CMT results (%) according to various minimum ages

From: Meta-analysis and systematic review of factors biasing the observed prevalence of congenitally missing teeth in permanent dentition excluding third molars

Cutoff age (year) <Cutoff ≥Cutoff  
N Mean (%) N Mean (%) Difference P value
6 13 5.85 64 6.27 0.42 0.704
7 28 6.41 49 6.08 -0.33 0.687
8 37 6.39 40 6.02 -0.36 0.62
9 42 6.42 35 5.93 -0.49 0.49
10 50 6.77 27 5.14 -1.64 0.018
11 54 6.68 23 5.06 -1.63 0.028
12 57 6.64 20 4.94 -1.70 0.033
13 64 6.52 13 4.60 -1.92 0.074
14 66 6.39 11 5.05 -1.34 0.239
16 71 6.34 6 4.50 -1.84 0.011
  1. N number of studies.