RESUMO
OBJECTIVE: To evaluate the relationship between neonatal oxygen supplementation (O2) and childhood cancer in the Collaborative Perinatal Project (CPP). STUDY DESIGN: The CPP consisted of 54,795 children born between 1959 and 1966 and followed to age 8 years. We used Cox proportional hazards modeling to examine the association between history of neonatal O2 and cancer (n = 48). RESULTS: The hazard ratio (HR) for any O2 was 1.77 (95% confidence interval [CI] = 0.94 to 3.35). The HR for continuous duration of O2 was near 1 and not significant. However, the HRs were 0.69 (95% CI = 0.17 to 2.88) and 2.87 (95% CI = 1.46 to 5.66) when comparing 0 to 2 and 3 or more minutes of O2, respectively, to no O2. The latter association was weaker (HR = 2.00; 95% CI = 0.88 to 4.54) and not significant ( P = .10) when analysis was restricted to cancers diagnosed after age 1 year (n = 41). CONCLUSIONS: These findings are consistent with an association between O 2 for 3 minutes or longer and cancer in childhood, and should serve as a basis for further study.
Assuntos
Neoplasias/etiologia , Oxigenoterapia/efeitos adversos , Oxigênio/efeitos adversos , Criança , Pré-Escolar , Relação Dose-Resposta a Droga , Seguimentos , Humanos , Lactente , Recém-Nascido , Neoplasias/epidemiologia , Oxigênio/administração & dosagem , Modelos de Riscos Proporcionais , Fatores de Risco , Estados Unidos/epidemiologiaRESUMO
OBJECTIVE: Improvements in survival after childhood cancer have increased emphasis on health-related quality of life (HRQoL) of survivors. We developed the Minneapolis-Manchester Quality of Life-Youth Form (MMQL-YF) as a standardized patient self-report instrument designed to assess HRQoL in childhood cancer survivors between the ages of 8 and 12 years. STUDY DESIGN: To validate the instrument, the MMQL-YF was administered to 643 children (481 healthy, 162 with cancer). Factor analysis was conducted to refine the instrument, and Cronbach's alpha coefficient was used to measure its internal reliability. Known-groups validity was determined by comparing healthy children with those with cancer. Construct validity was studied by a comparison of similar domains in the MMQL-YF and the Child Health Questionnaire (CHQ). Stability was tested by re-administration of the MMQL-YF 2 weeks later. RESULTS: Internal consistency reliability was in the acceptable range for this instrument. The MMQL-YF was able to distinguish between known groups, and its scales correlated highly with similar CHQ domains. Test-retest reliability showed that the instrument was extremely stable in all scales tested. CONCLUSION: Data provide evidence for the validity and reliability of the MMQL-YF as a comprehensive, multidimensional, self-report instrument for measuring HRQoL among childhood cancer survivors.