Associations between each measurement of breastfeeding history (incorporated as continuous variables) and metabolic syndrome in all participants and by age group.

Abbreviations: OR, odds ratio; CI, confidence interval. a, b, c Each index of breastfeeding history was measured in the same way as those in Tables 1 and 2 and was incorporated in the models as a continuous variable. d This model incorporated the same covariates as those of the multivariable-adjusted model in Table 2. (XLSX)