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Table 9 Comparison of our African in-out 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—in-out Andrews—in out Comparison
  n Mean Standard deviation n Mean Standard deviation t test p level
U1 58 1.62 .30 240 2.01 .32 −8.73 <0.001
U2 58 1.25 .24 240 1.84 .30 −15.82 <0.001
U3 58 1.65 .31 240 2.67 .39 −21.40 <0.001
U4 58 1.89 .33 240 2.54 .35 −13.36 <0.001
U5 58 1.85 .29 240 2.48 .36 −14.22 <0.001
U6 58 2.29 .40 240 2.88 .40 −10.17 <0.001
U7 58 2.47 .56 238 3.00 .51 −6.58 <0.001
L1 58 1.18 .21 240 1.59 .27 −12.61 <0.001
L2 58 1.16 .19 240 1.64 .32 −14.63 <0.001
L3 58 1.36 .28 240 2.37 .40 −22.57 <0.001
L4 58 2.01 .38 240 2.72 .43 −12.52 <0.001
L5 56 2.06 .45 240 2.60 .34 −8.49 <0.001
L6 58 2.53 .37 240 3.02 .40 −9.00 <0.001
L7 58 2.22 .65 236 2.79 .47 −6.22 <0.001