Early Life Growth and the Development of Preschool Wheeze, Independent from Overweight - The LucKi Birth Cohort Study.pdf
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… and parental history of atopy were available from the baseline questionnaire. Breastfeeding duration, day care attendance, and environmental tobacco smoke were reported in the follow-up questionnaires at age 7 months, 14 months, and 3 years. We cross-checked variables that were also avail- able from the registry: sex, gestational age at birth, and smok- ing during pregnancy. The variables breastfeeding duration, day care attendance, and environmental tobacco smoke were defined for each time period … growth [cm] between wheezers and nonwheezers: B, �1.23; 95% CI, �2.15 to �0.31), attenuated by age 14 months (B,�0.51; 95% CI,�0.92 to�0.10), and had dis- appeared by age 3 years (B, 0.22; 95% CI, �0.26 to 0.70) (Figure 2). 346 Sensitivity Analyses To check for a nonlinear association between birth weight and the outcome variables wheeze and overweight, we added a centralized quadratic term for birth weight to the univari- able models. The quadratic term was not statistically signifi- cant in any model, and thus …