Table 1.

Baseline Characteristics of the Cohort by Thyroid Cancer Status, Shanghai Women’s Health Study

	Total Cohort (n = 73,317)	Thyroid Cancer Cases (n= 164)
Age at cohort entry, years, mean (SD)	52.0 (9.1)	50.1 (8.4)
Education, %
Elementary school or lower	21	13
Middle school	37	36
High school	28	35
College or higher	14	16
Cancer in first-degree relative, %	25.3	33.5
Diabetes, %	4.3	3.7
Any alcohol intake, %	2	0.7
Ever smoker, %	2.8	1.2
Total caloric intake, kcal/day, mean (SD)	1,685.1 (407.5)	1,716.4 (470.5)
Body mass index, mean (SD)	23.4 (3.2)	23.1 (2.5)
Total physical activity, metabolic equivalent tasks-hours/week, mean (SD)	106.6 (45.1)	101.1 (47.3)