Table 1: Characteristics of the clinical series at diagnosis.

Total
( = 242)
PR
( = 136)
No PR
( = 106)
a

Sex— (%)0.35
 Girls115 (47.5)61 (44.8)54 (50.9)
 Boys127 (52.5)75 (55.1)52 (49.1)
Age at
 Mean—yearb8.8 ± 3.88.9 ± 3.88.9 ± 3.90.96
 Median—year9.59.49.6
 Range—year 0.9–16.41.4–16.40.9–16.4
 Girls—yearb9.4 ± 3.49.3 ± 3.59.5 ± 3.40.75
 Boys—yearb8.5 ± 4.28.6 ± 4.18.2 ± 4.50.65
 0–4  years— (%)44 (18.2)21 (15.4)23 (21.7)0.50
 5–9  years— (%)93 (38.4)56 (41.2)37 (34.9)
 >10  years— (%)103 (42.6)58 (42.6)45 (42.4)
Height -score at
 Girls0.0 ± 1.20.0 ± 1.20.0 ± 1.10.72
 Boys0.0 ± 1.20.0 ± 1.0−0.2 ± 1.40.36
BMI -score at
 Girls0.0 ± 1.1−0.1 ± 0.9+0.1 ± 1.20.34
 Boys+0.3 ± 1.1+0.3 ± 1.0+0.3 ± 1.30.64

Categorical variables were analyzed using chi-square test; continuous variables were analyzed using chi-square test with trend; ages at diagnosis were analyzed using unpaired -test. bPlus-minus values are means ± SD. : diagnosis.