TABLE 3.

Hazard ratios for ovarian cancer according to mothers’ pelvic diameters and age at menarche

	Menarche at age 14 years or less				Menarche at age 15 years or more
	Hazard ratio	95% CI	No. of cases	No. of women	Hazard ratio	95% CI	No. of cases	No. of women
Intercristal diameter (cm)
≤27.5	1.0	Baseline	1	575	1.0	Baseline	7	610
27.6–28.5	4.8	0.6–41	5	579	0.4	0.1–1.7	3	570
28.6–29.5	4.9	0.5–44	4	479	0.6	0.1–2.3	3	469
>29.5	7.3	0.8–63	5	391	0.4	0.1–1.9	2	397
P for trend	0.01				0.75
Adjusted for height	0.004				0.65
Interspinous diameter (cm)
≤25.0	1.0	Baseline	2	746	1.0	Baseline	6	773
25.1–26.0	2.1	0.4–13	3	558	0.8	0.2–2.9	4	577
26.1–27.0	2.8	0.5–17	3	435	0.3	0.0–2.6	1	403
>27.0	9.5	2.0–46	7	285	1.5	0.4–5.5	4	298
P for trend	0.002				0.63
Adjusted for height	0.001				0.79
Intertrochanteric diameter (cm)
≤30.5	1.0	Baseline	1	583	1.0	Baseline	4	671
30.6–31.5	3.3	0.3–32	3	547	2.3	0.6–8.7	6	546
31.6–32.5	8.2	1.0–67	7	486	1.5	0.3–7.1	3	460
>32.5	5.4	0.6–49	4	399	1.0	0.2–5.4	2	368
P for trend	0.02				0.79
Adjusted for height	0.003				0.64