All outcome measures were determined at baseline, 4, 12, and 24 weeks.
The stability of the baselines of these three measures was determined by repeated measures ANOVAs on the values of the 12-minute periods preceding stimulus presentations, with the factor Stimulus test periods.
Parents completed the Child Behavior Checklist [21] before other baseline measures were obtained to determine if the child should be excluded from participation because of clinically significant elevations (above the 70th percentile) on either the externalizing or internalizing scale.
Baseline measures were taken to determine the level of knowledge about radon, recall of previous risk information (there had been widespread media coverage) and perceived risk.
The test retest reliability of each measure was determined using two baseline measurements performed before exercise by an interclass correlation coefficient (R) and coefficient of variation (CV).
Baseline measures were acquired between all conditions.
METHODS: Baseline measures were assessed via telephone survey.
Baseline measures were repeated.
The baseline measures were obtained before randomisation.
Differences on other baseline measures were negligible.
