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Table 1 Statistical comparison of groups for mast cell counts

From: Biocompatibility of nanosilver-coated orthodontic brackets: an in vivo study

Days Groups Mast cell counts Mann–Whitney U test 95 % confidence interval for mean
n Mean ± SD Med. Min./max. Mean rank U p Lower bound Upper bound
7 Study 6 6.50 ± 4.09 6.50 1.0/11.0 3.83 2.00 0.009* 2.2 10.8
Control 6 23.83 ± 12.24 21.00 8.0/45.0 9.17 11.0 36.8
Sum 12 15.17 ± 12.55 11.00 1.0/45.0   12.8 33.6
14 Study 6 23.17 ± 9.91 20.00 14.0/37.0 7.92 9.50 0.180 8.1 22.2
Control 6 15.17 ± 6.74 14.50 8.0/27.0 5.08 17.876 31.457
Sum 12 19.17 ± 9.09 16.00 8.0/37.0   13.9 31.4
30 Study 6 24.67 ± 6.47 25.50 17.0/31.0 7.08 14.50 0.589 13.887 20.113
Control 6 22.67 ± 8.36 21.50 13.0/37.0 5.92 7.3 25.3
Sum 12 23.67 ± 7.20 22.50 13.0/37.0   2.2 10.8
60 Study 6 17.00 ± 2.97 17.50 13.0/20.0 7.75 10.50 0.240 11.0 36.8
Control 6 16.33 ± 8.57 13.50 10.0/33.0 5.25 12.8 33.6
Sum 12 16.67 ± 6.12 16.00 10.0/33.0   8.1 22.2
  1. *p<0.05