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. 2019 Jun 17;16(12):2138. doi: 10.3390/ijerph16122138

Table 2.

Proportion of subjects (124 grade 5–6 elementary schoolchildren) in tibial tuberosity maturity stages, as well as demographic characteristics, frequency of Osgood–Schlatter disease, and cartilage thickness at the tibial tuberosity of subjects in each maturity stage by sex.

Boys Cartilaginous Stage a Apophyseal Stage b Epiphyseal Stage c Bony Stage p-Value # Multiple Comparisons ##
n = 52 (100) 22 (42) 12 (23) 18 (35) 0
Demographic characteristics
 Age (years) 10.5 ± 0.6 11.3 ± 0.6 11.3 ± 0.5 - <0.001 a < b **, a < c **
 Height (cm) 139 ± 4 145 ± 3 150 ± 5 - <0.001 a < b **, a < c **, b < c **
 Weight (kg) 33 ± 4 34 ± 5 40 ± 7 - <0.001 a < b *, a < c **, b < c *
 Appearance of voice change 0 0 1/18 (6) - 0.382
 Sports club affiliation 11/22 (50) 9/12 (75) 15/18 (83) - 0.067
Osgood–Schlatter disease 0 0 0 - -
Cartilage thickness (mm) 8.1 ± 1.4 6.2 ± 1.2 5.3 ± 0.7 - <0.001 a > b **, a > c **
Girls Cartilaginous Stage a Apophyseal Stage b Epiphyseal Stage c Bony Stage p-Value # Multiple Comparisons ##
n = 72 (100) 2 (3) 5 (7) 64 (89) 1 (1)
Demographic characteristics
 Age (years) 10.0 ± 0.0 10.2 ± 0.4 11.0 ± 0.8 11 0.013 a’< c’ **, b’ < c’ *
 Height (cm) 132 ± 4 136 ± 2 148 ± 7 154 0.008 b’ < c’ **
 Weight (kg) 29 ± 0 29 ± 2 40 ± 7 53 <0.001 a’ < c’ **, b’ < c’ **
 Appearance of menarche 0 0 27/64 (42) 1/1(100) 0.097
 Sports club affiliation 2/2 (100) 4/5 (80) 39/64 (61) 1/1(100) 0.475
Osgood–Schlatter disease 0 0 5/64 (8) 0 0.880
Cartilage thickness (mm) 6.9 ± 0.9 5.8 ± 1.2 4.8 ± 0.9 0 0.002 a > c *

Values are mean ± standard deviation or number of students (%). # by one-way analysis of variance for numerical data or by the chi-squared test for percentage data. ## by Bonferroni: a, b, c or by Games-Howell: a’, b’, c’; ** p < 0.01, * p < 0.05.