highly significantp < 0.0001
The relative risk of each stage by sex (women/men) was: Stage 1 , 0.72 (more in men); Stage 2 , 1.11; Stage 3 , 1.68; and Stage 4 , 9.29 (all three more in women); these sex-differences were highly significant (overall χ 2 [d f = 3] = 51.3, p < 0.0001).