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Table 5 Independent t-tests comparing the measure of clinical recession in the normal wear and severe wear subsets

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 0.29 0.59 0.12 0.906
Severe wear 12 0.27 0.47
U5 Normal wear 110 0.22 0.41 1.88 0.062
Severe wear 16 0.03 0.12
U4 Normal wear 109 0.27 0.48 0.86 0.393
Severe wear 9 0.13 0.35
U3 Normal wear 110 0.32 0.54 0.55 0.581
Severe wear 18 0.25 0.43
U2 Normal wear 106 0.16 0.36 0.65 0.515
Severe wear 11 0.09 0.30
U1 Normal wear 97 0.18 0.43 1.92 0.058
Severe wear 22 0.00 0.00
L6 Normal wear 78 0.11 0.42 − 0.82 0.415
Severe wear 44 0.18 0.48
L5 Normal wear 104 0.18 0.40 0.59 0.557
Severe wear 17 0.12 0.33
L4 Normal wear 107 0.21 0.44 − 0.63 0.532
Severe wear 10 0.31 0.70
L3 Normal wear 103 0.26 0.51 1.48 0.141
Severe wear 29 0.12 0.28
L2 Normal wear 102 0.09 0.30 0.78 0.439
Severe wear 23 0.04 0.20
L1 Normal wear 97 0.19 0.41 1.14 0.256
Severe wear 26 0.09 0.28
  1. p < .05, comparing the normal wear and severe wear subgroups; no significant difference was found in the clinical recession due to tooth wear
  2. Reprinted with permission from Eltink et al. [17, 27]