Table 6.

Chronological age and Risser sign value

Risser sign	No. of cases	Chronological age (mean ± SD)	Min–max
0	46	12.4 ± 1.2	10.2–15.0
1	20	13.9 ± 1.5	11.2–16.9
2	17	13.9 ± 1.1	12.2–15.8
3	21	14.3 ± 0.9	12.3–15.7
4	60	15.0 ± 1.2	12.2–17.6
5	37	17.3 ± 2.0	14.0–20.0
all	201	14.6 ± 2.2	10.2–20.0

Risser 0 and Risser 5 groups differ significantly from any other group (Kruskal–Wallis test, nonparametric ANOVA), differences among Risser 1, Risser 2, Risser 3 or Risser 4 were not significant (Dunn’s multiple comparison test).

SD standard deviation