Medical advances have signifi cantly improved the longevity of patients with cystic fi brosis (CF). The median survival age is approximately 37 years, and many patients live well into middle age. 1 Newborn screening (NBS) is an innovation that provides early intervention for affected infants. Although neo natal diagnosis offers nutritional advantages, over time, patients experience complications that require increasingly complex treatments 2-4 for which they and their families typically shoulder most of the burden. The progressive nature of CF and treatment side effects can adversely affect every aspect of life. Thus, there has been a growing interest in understanding how this chronic illness and related life-long care affect health-related quality of life (HRQOL) for persons with CF.This study examined relationships between pulmonary health and HRQOL in patients with CF who participated in the Wisconsin CF Neonatal Screening randomized clinical trial (RCT). 2 Although HRQOL Background: The objective of this study was to examine relationships between pulmonary health and health-related quality of life (HRQOL) in patients with cystic fi brosis (CF) evaluated longitudinally in the Wisconsin Newborn Screening Project. Methods: Patients aged 8 to 18 years (mean Ϯ SD, 13.5 Ϯ 2.8) in early diagnosis (n 5 45) and control (n 5 50) groups completed Cystic Fibrosis Questionnaires (CFQs) to measure HRQOL at three data points over a 2-year period. Pulmonary health was evaluated concurrently by the Wisconsin chest x-ray scoring system (WCXR) and pulmonary function tests (PFTs). Results: WCXR showed signifi cant group differences ( P Յ .023), with the early diagnosis group showing more-severe lung disease. When adjusted for group differences in mucoid Pseudomonas aeruginosa status and pancreatic status, however, WCXR differences and PFT data were not signifi cant. Most patients (74%) had FEV 1 values Ն 80% predicted (within normal range). For patients aged , 14 years, as WCXR scores worsened CFQ respiratory and physical domain scores decreased (both P Յ .007). FEV 1 /FVC showed a positive relationship with the respiratory and physical domains (both P Յ .006). WCXR scores for patients aged Ն 14 years were associated with CFQ weight, respiratory, and health domains (all P Յ .011). FEV 1 was associated with CFQ weight, respiratory, health, and physical domains (all P Յ .003). Changes in pulmonary health were not associated with changes in CFQ over time. Signifi cant group differences on the CFQ-Child social functioning domain favored the control group. Conclusions: To our knowledge, this study is the fi rst to compare pulmonary outcomes with HRQOL indicators assessed by serial, standardized, patient-reported outcome measures for patients with CF identifi ed either through newborn screening or diagnosed by use of traditional methods. This study found no benefi ts of newborn screening for pulmonary health or HRQOL after controlling for risk factors. Using WCXR and PFT data collectively helped to identify associations between pulmo...