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There were 1981 singleton live births born to the SWS women up to the end of 2003, but 217 infants were excluded from the analysis for the following reasons: infants who were born at Anti-diabetic Compound Library was approved by the Southampton and South West Hampshire Local Research Ethics Committee. Before analysis, breastfeeding duration was categorized into six groups, and the number of months the mother had been back at work was grouped into three groups: 0, 6 months. Chest infection, bronchitis, bronchiolitis and pneumonia were combined into one variable labelled ��diagnosed lower respiratory tract infections��. Chest wheezing/whistling, prolonged cough, this website chest infection or bronchitis and bronchiolitis or pneumonia were combined to create a variable ��general respiratory morbidity��. Binary variables were created for each of the seven outcome variables coded as no episodes vs. one or more episodes of each category. All statistical analyses were performed using Stata version 10.1 (Strata Corp LP, College Station, TX, USA). Simple linear regression was used to determine univariate associations between breastfeeding duration and 13 maternal and infant factors: maternal age, BMI, smoking in pregnancy, number of months that the mother had been back at work, whether the woman lived with a partner, Index of Multiple Deprivation, educational attainment, social class, birth order, infant's age when solids were first regularly introduced, gestational age, birthweight (adjusted for gestational age and sex) and sex of the infant. Multiple linear regression models were used to determine associations between breastfeeding duration and infection after taking account of maternal and infant factors. Poisson regression RecBCD models with robust variance were used to calculate relative risks to quantify the relationship between breastfeeding duration and infectious morbidity (Barros & Hirakata 2003). Table?1 shows the characteristics of the women and the infants. Of the 1764 infants, 25% were breastfed up to 6 months and 10% for 12 or more months. We considered 13 maternal and infant factors as influences on breastfeeding duration. Ten of these were univariately associated with breastfeeding duration (P?