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Table 4 Independent t-tests comparing the no recession to recession subgroups using the gingival margin-papillae measure 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 No recession 96 2.33 0.73 − 7.53 0.000*
Recession 30 3.51 0.81
U5 No recession 105 2.45 0.70 − 5.76 0.000*
Recession 31 3.36 0.88
U4 No recession 96 3.00 0.69 − 6.74 0.000*
Recession 33 3.95 0.79
U3 No recession 102 4.08 0.79 − 6.23 0.000*
Recession 42 5.22 1.28
U2 No recession 103 3.28 1.05 − 2.62 0.000*
Recession 23 3.89 0.61
U1 No recession 107 3.84 1.05 − 3.40 0.000*
Recession 19 4.94 2.17
L6 No recession 93 2.51 0.61 − 6.51 0.000*
Recession 13 3.89 1.27
L5 No recession 101 2.74 0.63 − 5.13 0.000*
Recession 23 3.57 0.94
L4 No recession 96 3.39 0.69 − 3.15 0.000*
Recession 23 3.91 0.84
L3 No recession 104 3.91 0.91 − 5.71 0.000*
Recession 30 5.03 1.01
L2 No recession 114 2.93 0.82 − 1.18 0.239
Recession 11 3.27 1.33
L1 No recession 105 2.83 0.66 − 5.25 0.000*
Recession 22 3.76 1.05
  1. *p < .05, indicating a difference and comparing the no recession and recession subgroups—a true positive value
  2. Reprinted with permission from Eltink et al. [17, 27]