SHBG and endometrial cancer: For period‐related factors, age at menopause was positively associated with endometrial cancer incidence (p = 0.00098; OR = 1.242; 95% CI: 1.0919–1.4127), while age at menarche and SHBG levels were negatively associated with endometrial cancer incidence (p = 1.21e − 05; OR = 0.6852; 95% CI: 0.5784–0.8116 and p = 7.4e − 07; OR = 0.5914; 95% CI: 0.4804–0.7281, respectively).