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Table 3 Independent t-tests comparing the no recession to recession subgroups using the clinical crown height 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 6.41 0.85 − 10.41 0.000*
Recession 30 8.25 0.83
U5 No recession 105 6.94 0.86 − 7.57 0.000*
Recession 31 8.28 0.88
U4 No recession 96 7.94 0.82 − 6.62 0.000*
Recession 33 9.06 0.91
U3 No recession 102 9.73 0.89 − 7.36 0.000*
Recession 42 11.02 1.10
U2 No recession 103 8.66 0.99 − 5.27 0.000*
Recession 23 9.80 0.63
U1 No recession 107 10.13 1.00 − 5.31 0.000*
Recession 19 11.49 1.17
L6 No recession 93 6.56 0.71 − 5.88 0.000*
Recession 13 7.92 1.19
L5 No recession 101 7.24 0.82 − 6.07 0.000*
Recession 23 8.41 0.92
L4 No recession 96 8.14 0.75 − 6.35 0.000*
Recession 23 9.25 0.75
L3 No recession 104 9.50 1.16 − 7.08 0.000*
Recession 30 11.11 0.80
L2 No recession 114 8.22 0.92 − 6.05 0.000*
Recession 11 9.98 0.97
L1 No recession 105 7.99 0.98 − 7.17 0.000*
Recession 22 8.58 0.74
  1. *p < .05, indicating a difference and comparing the recession and no recession subgroups—a true positive value
  2. Reprinted with permission from Eltink et al. [17, 27]