Table 2.

Demographic data of the students

	Intervention (n = 307)	Control (n = 293)
Age–yr (S.D.)	12 (1)	12 (1)
Male gender – no. (%)	139 (45.3)	147 (50.2)
Height–cm (S.D.)	160 (7.8)	161 (8.6)
Weight– kg (S.D.)	46.5 (8.0)	47.6 (9.4)
CPR-training < 1 year – no. (%)	4 (1.4)	5 (1.7)
CPR-training > 1 year – no. (%)	16 (5.2)	13 (4.4)
No CPR-training ever – no. (%)	284 (92.5)	274 (93.5)