... for children ages 2–4.DataStat, a nationally-based survey administration firmlocated in Michigan, was contracted to administer the Cal-ifornia SCHIP statewide mail survey. DataStat mailed the PedsQL™ ... designed the instrument and drafted the manuscript.TMB participated in study conceptualization and design, and performed the statistical analysis. All authors read and approved the final manuscript.AcknowledgementsThis ... measure the patient's perceptions of the impact of disease and treatment as clinical trial endpoints, and include multi-item HRQOL instruments, as well as single-item measures (e.g., pain...