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Table 7 Independent t-tests comparing the gingival margin-papillae measurements for the normal wear and severe wear subsets for the combined four groups

From: Quantitative measures of gingival recession and the influence of gender, race, and attrition

Tooth class Group n Mean SD t p
U6 Normal wear 107 2.51 0.82 − 1.33 0.187
Severe wear 12 2.87 1.04
U5 Normal wear 110 2.62 0.82 1.07 0.285
Severe wear 16 2.40 0.53
U4 Normal wear 109 3.22 0.82 1.51 0.134
Severe wear 9 2.78 0.47
U3 Normal wear 110 4.39 1.08 0.46 0.649
Severe wear 18 4.27 0.99
U2 Normal wear 106 3.39 1.01 0.96 0.341
Severe wear 11 3.08 1.19
U1 Normal wear 97 3.90 1.14 0.17 0.868
Severe wear 22 3.86 0.81
L6 Normal wear 78 2.62 0.88 0.06 0.950
Severe wear 44 2.61 0.76
L5 Normal wear 104 2.90 0.74 0.31 0.761
Severe wear 17 2.93 0.98
L4 Normal wear 107 3.45 0.71 − 0.10 0.920
Severe wear 10 3.48 0.86
L3 Normal wear 103 4.20 1.01 1.59 0.114
Severe wear 29 3.87 0.91
L2 Normal wear 102 2.98 0.88 0.19 0.851
Severe wear 23 2.94 0.87
L1 Normal wear 97 2.99 0.74 1.32 0.189
Severe wear 26 2.77 0.78
  1. p < .05, indicating that the gingival margin-papillae measure comparing the normal wear and severe wear subgroups was not different because of tooth wear—a true negative value
  2. Reprinted with permission from Eltink et al. [17, 27]