Table 2.

Demographics of the patient collective. The p-value denotes the significance of a chi-square and a t-test for sex and age between the training and the internal and external validation cohorts, respectively

	All	Training cohort	Internal validation cohort	External validation cohort
Gender [F]	45% (1287/2865)	45% (1065/2350)	44% (143/327) (p = 0.63)	42% (79/188) (p = 0.42)
Age	14.0 ± 4.8 (range: 0–21)	14.0 ± 4.8 (range: 0–21)	14.0 ± 4.8 (range: 0–21) (p = 0.92)	13.6 ± 4.4 (range: 1–21) (p = 0.12)