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Table 4 Comparison of our African tip values with those measured by Andrews

From: Three-dimensional assessment of teeth first-, second- and third-order position in Caucasian and African subjects with ideal occlusion

Africans—tip Andrews’ values Comparison
  n Mean Standard deviation n Mean Standard deviation t test p level
TIP U7 58 −3.06 6.78 240 .39 5.69 −3.58 <0.001
TIP U6 58 9.43 3.53 240 5.73 1.90 7.71 <0.001
TIP U5 58 5.96 5.84 240 2.82 1.52 4.07 <0.001
TIP U4 58 3.29 4.45 240 2.65 1.69 1.07 ns
TIP U3 58 8.23 5.20 240 8.40 2.97 −.24 ns
TIP U2 58 9.23 3.87 240 8.04 2.80 2.20 0.031
TIP U1 58 3.68 3.55 240 3.59 1.65 .18 ns
TIP L7 58 12.65 5.83 240 2.94 2.05 12.50 <0.001
TIP L6 58 6.30 5.36 240 2.03 1.14 6.03 <0.001
TIP L5 58 3.60 4.02 240 1.54 1.35 3.84 <0.001
TIP L4 58 2.95 3.89 240 1.28 1.90 3.19 0.002
TIP L3 58 3.478 4.850 240 2.48 3.28 1.49 ns
TIP L2 58 −.26 3.01 240 .38 1.47 −1.57 ns
TIP L1 58 −1.13 3.30 240 .53 1.29 −3.77 <0.001
  1. ns not significant.