Table 2.

Warfarin usage among patient subgroups (30 days before injury), by patient characteristics (total n=4622)

Subgroups		% used warfarin	P value
Age at injury, yrs	66–70	51.3	<0.001
	70<–75	45.5
	75<–80	43.3
	80<–85	43.4
	85<–older	34.2
Race	White	40.5	0.001
	Black	29.5
	Other	30.0
Sex	Male	41.8	0.059
	Female	38.9
Comorbid conditions-possible indications
Valvular heart disease/valve replacement	Y	54.6	<0.001
	N	37.5
Atrial flutter	Y	50.0	<0.001
	N	39.1
Heart failure	Y	42.5	<0.001
	N	34.1
Stroke or TIA	Y	44.8	<0.001
	N	38.5
Comorbid conditions-possible contraindications
Chronic liver disease	Y	35.3	0.235
	N	39.9
Chronic kidney disease	Y	38.2	0.168
	N	40.4
Coagulation defect	Y	38.3	0.684
	N	39.8
Alcohol abuse	Y	32.4	0.202
	N	39.9
Counts of other CCW chronic conditions	0–1	42.1	0.021
	2	41.7
	3	39.3
	4	35.3
	5 and above	37.3

Note:

1. Abbreviations: TIA, transient ischemic attack; TBI, traumatic brain injury; CCW: Chronic Conditions Data Warehouse; Y, yes; N, No
2. P value obtained from Chi-square test