Skip to main content

Advertisement

Table 6 Independent t-tests comparing the clinical crown height for the normal wear and severe wear subsets measured by the clinical crown height 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 6.75 1.09 0.10 0.923
Severe wear 12 6.71 1.25
U5 Normal wear 110 7.21 1.00 2.29 0.023*
Severe wear 16 6.62 0.69
U4 Normal wear 109 8.20 0.94 3.21 0.002*
Severe wear 9 7.18 0.52
U3 Normal wear 110 10.11 1.13 3.68 0.000*
Severe wear 18 9.09 0.84
U2 Normal wear 106 8.89 1.00 3.16 0.002*
Severe wear 11 7.88 1.13
U1 Normal wear 97 10.41 1.12 3.13 0.002*
Severe wear 22 9.63 0.72
L6 Normal wear 78 6.78 0.92 2.31 0.023*
Severe wear 44 6.40 0.77
L5 Normal wear 104 7.50 0.84 3.56 0.001*
Severe wear 17 6.66 1.25
L4 Normal wear 107 8.37 0.83 3.52 0.001*
Severe wear 10 7.40 0.87
L3 Normal wear 103 10.00 1.28 4.14 0.000*
Severe wear 29 8.93 0.99
L2 Normal wear 102 8.42 1.02 3.04 0.003*
Severe wear 23 7.72 0.86
L1 Normal wear 97 8.41 1.01 4.65 0.000*
Severe wear 26 7.37 1.04
  1. *p < .05, comparing the clinical crown between the normal wear and severe wear subgroups and showing the significant differences for all tooth classes due to a decrease in the clinical crown height in the severe wear group—a false positive value
  2. Reprinted with permission from Eltink et al. [17, 27]