Social inequalities in changes in health-related behaviour among Slovak adolescents aged between 15 and 19: A longitudinal study

Table 2 Health-related behaviour at T1, comparison of participants and drop-outs at T2

		participants at T1 % (N)	drop-out at T2 % (N)	participants at T2 % (N)	Cohen's w ¹
Males	Smoking	23.9 (214)	26.1 (140)	20.6 (74)	0.064
	Alcohol	12.8 (115)	12.7 (68)	13.0 (47)	0.005
	Marijuana	7.3 (65)	9.3 (50)	4.2 (15)	0.098
	No sport	9.1 (82)	7.1 (38)	12.2 (44)	0.087
Females	Smoking	18.2(173)	18.6 (87)	17.8 (86)	0.010
	Alcohol	8.3(79)	7.9 (37)	8.7 (42)	0.014
	Marijuana	5.5 (52)	5.2 (25)	5.8 (27)	0.013
	No sport	26.7 (254)	26.5 (128)	26.9 (126)	0.005

1 Cohen's w is a measure of the strength of the effect of a characteristic on the outcome. It is independent from sample size, and is expressed as effect size (ES). It could be interpreted as follows: if w < 0.1 the effect is trivial, if w ranges from 0.1 to 0.3 the effect is small, if w ranges from 0.3 to 0.5 the effect is moderate and if w > 0.5 the effect is large.
T1 – baseline measurement
T2 – follow up

ISSN: 1471-2458