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Table 3 Differences between students who were retained beyond baseline (repeat) and those that were lost to follow-up (single) on baseline scores

From: A universal harm-minimisation approach to preventing psychostimulant and cannabis use in adolescents: a cluster randomised controlled trial

Outcome variable Single Repeat df df error F p
Cannabis Knowledge 8.58 8.78 1 1727 1.46 p = 0.23
Psychostimulant Knowledge 8.26 8.51 1 1721 2.16 p = 0.14
Cannabis Attitudes 9.64 8.24 1 1730 47.24 p < 0.0001
Psychostimulant Attitudes 10.20 8.91 1 1730 41.57 p < 0.0001
Cannabis frequency of use (three months) 0.47 0.12 1 1720 48.25 p < 0.001
Meth/amphetamine frequency of use (12 months) 0.22 0.07 1 1727 17.61 p < 0.001
Ecstasy frequency of use (last 12 months) 0.29 0.09 1 1727 29.8 p < 0.001
Cannabis intention 12 months 1.10 0.60 1 1729 44.61 p < 0.001
Meth/amphetamine intention 12 months 0.62 0.30 1 1727 38.20 p < 0.001
Ecstasy intention 12 months 0.71 0.38 1 1727 29.66 p < 0.001
  Single Repeat df   χ 2 p
Lifetime cannabis use 0.22 0.10 1   33.58 p < 0.0001
Lifetime Methamphetamine use 0.10 0.03 1   27.37 p < 0.0001
Lifetime ecstasy use 0.12 0.05 1   32.2 p < 0.0001