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Duration of high-intensity breastfeeding and the development of abnormal glucose tolerance during the first year (up to 14 months) postpartum. ¶ Group 1: women who met the high-intensity breastfeeding definition only for 6-8 weeks and not at 6 months postpartum. § Group 2: women with high-intensity breastfeeding at 6 months but not at 12 months postpartum. † Group 3: women still engaging in high-intensity breastfeeding at 12 months postpartum. P values were from the chi-squared test
