Top: ability to communicate with adolescent/parent about sexual topics (How would you rate your ability to communicate with your child mother/father about sexual topics? excellent/very good/good/fair/poor/very poor/terrible)

Bottom: openness of parent-adolescent communication scale (12 item scale for parents; 7 item scale for adolescents). Because units of scale have no absolute meaning, we have expressed all scores on this scale as centile of baseline distribution (control and intervention combined) to which they correspond. For example, score of 65th centile at three month follow-up for intervention group indicates that average intervention participant at three month follow-up had score better than 65% of participants at baseline. In tests for linear time trend across survey waves, the parent control group does not change significantly over four surveys (P=0.14), while parent intervention group increases significantly (P=0.001); adolescent control group declines significantly over time (P=0.006), while adolescent intervention group increases (P=0.005). *P<p><b>Copyright information:</b></p><p>Taken from "Evaluation of , a new worksite based parenting programme to promote parent-adolescent communication about sexual health: randomised controlled trial"</p><p></p><p>BMJ : British Medical Journal 2008;337():-.</p><p>Published online 31 Jul 2008</p><p>PMCID:PMC2500197.</p><p>