Table 4.

Rates of warfarin use by stroke and bleeding risk category

Database	Bleeding risk factors	Stroke risk factors (%)					All stroke risks (%)
		None or 1+ weak	1 moderate	2+ moderate	1+ high	2+ moderate or 1+ high (combined)
NNHS	0–1	20	43	55	80	56	45
	2	11	41	51	78	54	50
	3	0	31	37	60	42	40
	4+	0a	7	17	32	21	19
	All bleeding risks	17	30	32	46	36	34
AnalytiCare	0–1	41	44	56	55	56	49
	2	43	47	50	59	52	51
	3	50a	37	44	53	46	45
	4+	0a	14	42	41	42	41
	All bleeding risks	42	39	45	46	45	45

NNHS National Nursing Home Survey

^aSmall counts (sample, n < 10); age ≥75 years was considered a bleeding risk