2.1 Study design and population.
This was a cross-sectional, questionnaire-based study. To meet the
eligibility criteria caregivers had to be over 18 years of age and be
caring for a child aged 0-16 who had received a diagnosis of AD from a
doctor and was currently experiencing AD symptoms. An a prioripower analysis indicated that a sample of 84 was required to obtain
statistical power at 80% with alpha set at 0.05 (two-tailed) and a
medium effect size (r=0.3).