Table 2 Comparison of different dental arch measurements by age and gender
Measurement | Overall mean (SD) | Age group 1 mean (SD) | Age group 2 mean (SD) | T test (P value) | Female mean (SD) | Male mean (SD) | T test (P value) |
|---|---|---|---|---|---|---|---|
Maxillary | |||||||
Inter-canine distance | 35.93 (2.86) | 35.36 (3.10) | 36.24 (2.67) | −2.19 (0.03) | 35.30 (2.86) | 36.90 (2.60) | 4.19 (<0.01) |
Second inter-premolar distance | 42.64 (3.12) | 41.98 (2.98) | 43.00 (3.14) | −2.33 (0.02) | 41.84 (2.98) | 43.86 (2.94) | 4.95 (<0.01) |
First molar distance | 48.30 (3.46) | 47.52 (3.27) | 48.73 (3.50) | −2.5 (0.01) | 47.32 (3.36) | 49.82 (3.07) | 5.55 (<0.01) |
Total arch length | 32.68 (3.01) | 32.32 (2.82) | 32.89 (3.10) | −1.34 (0.18) | 32.24 (3.13) | 33.39 (2.67) | 2.8 (0.01) |
Anterior segment length | 13.36 (2.07) | 13.16 (2.20) | 13.50 (1.99) | −1.16 (0.25) | 13.21 (2.11) | 13.64 (2.00) | 1.51 (0.13) |
Posterior segment length | 20.00 (6.55) | 19.16 (1.56) | 20.46 (8.07) | −1.41 (0.16) | 19.70 (6.34) | 20.47 (6.89) | 0.85 (0.40) |
Mandibular | |||||||
Inter-canine distance | 27.06 (2.71) | 26.72 (3.01) | 27.24 (2.53) | −1.35 (0.18) | 13.20 (2.11) | 27.86 (2.67) | 3.58 (<0.01) |
Second inter-premolar distance | 36.55 (3.28) | 36.04 (3.51) | 36.84 (3.13) | −1.73 (0.09) | 35.60 (2.94) | 38.04 (3.25) | 5.76 (<0.01) |
First molar distance | 41.72 (4.14) | 41.14 (3.11) | 42.05 (4.62) | −1.53 (0.13) | 40.72 (4.47) | 43.19 (3.09) | 4.35 (<0.01) |
Total arch length | 29.35 (3.09) | 28.73 (2.91) | 27.72 (3.15) | −2.23 (0.03) | 29.88 (3.22) | 29.00 (2.95) | 2.01 (0.05) |
Anterior segment length | 9.26 (2.43) | 9.08 (1.93) | 9.36 (2.67) | −0.82 (0.42) | 10.04 (2.97) | 8.76 (1.86) | 3.97 (<0.01) |
Posterior segment length | 25.57 (18.91) | 22.37 (13.67) | 27.31 (21.06) | −1.86 (0.06) | 26.62 (20.28) | 23.95 (16.55) | −1.02 (0.31) |