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Table 8 Comparison of African and Caucasian in-out values

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

Africans—in-out Caucasians—in-out Comparison
  n Mean Standard deviation n Mean Standard deviation t test p level
U1 58 1.62 .30 58 1.48 .30 2.60 0.012
U2 58 1.25 .24 58 1.15 .24 2.11 0.039
U3 58 1.65 .31 58 1.66 .34 −.30 ns
U4 58 1.89 .33 58 1.61 .24 5.20 <0.001
U5 58 1.85 .29 58 1.66 .29 3.60 <0.001
U6 58 2.29 .40 58 2.01 .47 3.35 0.001
U7 58 2.47 .56 58 2.75 .62 −2.51 0.015
L1 58 1.18 .21 58 1.01 .32 3.42 0.001
L2 57 1.16 .19 58 .93 .32 4.65 <0.001
L3 58 1.36 .28 58 1.38 .27 −.41 ns
L4 58 2.01 .38 58 1.93 .28 1.30 ns
L5 56 2.06 .45 58 1.91 .32 2.06 0.044
L6 58 2.53 .37 58 2.66 .38 −1.96 ns
L7 56 2.22 .65 58 2.83 .72 −4.76 <0.001
  1. ns not significant.