Table 2.

Incidence of heavy menstrual bleeding (HMB) and HMB with heaviness that interferes with life

Duration follow-up	Age (years)	Number at risk	Incident cases of HMB	6-month incidence rate of HMB (95% CI)	Incident cases of HMB with heaviness that interferes with life	6-month incidence rate of HMB with heaviness that interferes with life (95% CI)
6 months	40–44	395	87	22.0% (18.2–26.4%)	17	4.3% (2.7–6.8%)
	45–49	419	80	19.1% (15.6–23.1%)	10	2.4% (1.3–4.3%)
	50–54	218	39	17.9% (13.4–23.5%)	4	1.8% (0.7–4.6%)
				1-year cumulative incidence rate of HMB (95% CI)		1-year cumulative incidence rate of HMB with heaviness that interferes with life (95% CI)
1 year	40–44	359	108	30.1% (25.6–35.0%)	25	7.0% (4.8–10.1%)
	45–49	366	100	27.3% (23.0–32.1%)	17	4.6% (2.9–7.3%)
	50–54	202	60	29.7% (23.8–36.3%)	12	5.9% (3.4–10.1%)
				2-years cumulative incidence rate of HMB (95% CI)		2-year cumulative incidence rate of HMB with heaviness that interferes with life (95% CI)
2 years	40–44	177	76	42.9% (35.9–50.3%)	15	8.5% (5.2–13.5%)
	45–49	164	60	36.6% (29.6–44.2%)	10	6.1% (3.4–10.9%)
	50–54	92	33	35.9% (26.8–46.1%)	6	6.5% (3.0–13.5%)