... laughing with friends, swim-ming in chlorinated pools, riding horses, playing with pets, going to camp, eating certain foods, being indoor oroutdoor, exercising, and sleeping [11-17]. Without the ... asthma.ConclusionFindings of this study provide evidence of internal consist-ency reliability and construct validity of the PLA as ameasure of one aspect of quality of life for children and adolescents with ... col-lection.Power analysis In determining sample size for psychometric testing, the number of items contained in the target instrument, sen-sitivity of other instruments being used, and data analysistechniques...