Subgroup analysis of the association between season of birth and the risk of type
2 diabetes in adulthood among the whole cohort according to potential baseline
risk factors. Horizontal lines represent 95% CIs. HRs and 95%CIs are for
comparison of combined category of Spring-, Autumn-, and Winter-born
participants with Summer-born. Multivariable model was adjusted for: age; sex;
level of education; marital status; alcohol consumption; smoking status;
physical activity; intake frequencies of red meat, fresh fruits, and vegetables;
family history of diabetes; and BMI at baseline. The tests for interaction were
performed using likelihood ratio tests, which involved comparing models with and
without cross-product terms between the baseline stratifying variable and the
season of birth. Subgroup analysis according to weight change since 25 years:
N=386,753.