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Table 1 Distribution of the sample by age groups and sex

From: Accuracy assessment of dental age estimation with the Willems, Demirjian and Nolla methods in Spanish children: Comparative cross-sectional study

Age groups Total Mean SD Girls Boys
4-6.9 122 6.43 0.52 59 63
7-7.9 119 7.55 0.30 65 54
8-8.9 136 8.45 0.29 69 67
9-10.9 130 9.93 0.57 67 63
11-13.9 97 12.14 0.61 42 55
Total 604    302 302
SD Standard deviation