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

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

   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. 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.
  2. T1 – baseline measurement
  3. T2 – follow up