Table 1.

Baseline characteristics of the recruits included for model development and model validation.

Variable	All observations, N = 744
	Mean ± SD
Age (y)	21 ± 2.4
Height (m)	1.81 ± 6.4
Body mass (kg)	77.9 ± 7.9
Body fat %	13.6 ± 3.1
Cooper test (km)	2.87 ± 1.58
Push-ups in 2 minutes	54.2 ± 11.5
Sit-ups in 2 minutes	55.0 ± 7.5
Secondary vocational education (level 2 higher than 1)	Level 1: 184 (25%)
	Level 2: 130 (17%)
	Unknown: 430 (58%)