Claim — School prevention changed CU/CD scores

Supported

The published paper reports Time × Group effects and later between-group differences in CU traits and CD symptoms.

Critical qualification

Only three schools were in the longitudinal prevention phase: one intervention school and two control schools. Treatment was assigned at school level, while the main analysis was conducted at the child level with repeated-measures ANOVA. The apparent N=304 therefore does not provide 304 independent randomized treatment units.

Do not translate this claim into

• a conventional 304-person RCT;
• formal CD diagnostic remission;
• independent replication;
• dissemination-scale effectiveness.