Table 2. Prevalence of Heart Failure From 2000 to 2005 by Sex and by Age Group.

	Observation Year
	2000	2001	2002	2003	2004	2005	P for Trend
Women
No. of prevalent HF cases*	947	1265	1540	1680	1826	1898
Total No. of study participants	93 879	99 068	103 903	104 176	105 126	106 129
Prevalence, %	1.01	1.28	1.48	1.61	1.74	1.79	0.0006
Prevalence by age group, %
18–54 years	0.34	0.41	0.47	0.51	0.54	0.52
55–64 years	2.41	2.67	2.89	3.07	3.22	3.17
65–74 years	5.87	6.07	7.11	7.29	7.63	7.68
≥75 years	15.68	15.78	17.19	17.17	17.74	17.67
Men
No. of prevalent HF cases*	956	1193	1420	1633	1782	1916
Total No. of study participants	81 214	84 997	88 928	89 726	90 154	90 167
Prevalence, %	1.18	1.40	1.60	1.82	1.98	2.12	<0.0001
Prevalence by age group, %
18–54 years	0.41	0.47	0.53	0.57	0.60	0.60
55–64 years	3.35	3.53	4.13	4.25	4.42	4.64
65–74 years	8.05	8.03	8.54	9.68	10.48	10.14
≥75 years	17.00	15.62	17.01	18.61	18.37	19.75

^*The number of prevalent cases in each year does not necessarily equal the number of incident cases from that year plus the number of prevalent cases from the prior year because patients with prevalent HF may become lost to follow-up as the result of either death or discontinuation of their insurance plan.