TABLE II.

Sample Characteristics

Characteristic	Total	DA Group		Surgeon Group
		Long	Short	Usual Care	Patient Preference Report
No. of patients	1,124	567	557	574	550
Age* (yr)	65 ± 10	65 ± 10	65 ± 10	65 ± 10	65 ± 10
Female (vs. male)	57%	56%	58%	58%	57%
Race (white, non-Hispanic)†	89%	87%	91%	89%	89%
Knee (vs. hip)‡	67%	67%	68%	71%	63%
Paper DA (vs. online)	79%	79%	80%	80%	79%
High literacy (vs. low)	86%	86%	85%	84%	87%
Education (≥college)‡	54%	53%	54%	51%	57%
Insurance
Data missing	26%	25%	26%	18%	34%
Medicare	29%	30%	27%	30%	27%
Medicaid/dual eligible	10%	10%	11%	12%	8%
Commercial	36%	35%	36%	40%	31%
BMI*‡ (kg/m2)	30.1 ± 6.5	30.3 ± 6.3	30.0 ± 6.7	31.1 ± 6.6	29.3 ± 6.4
Charlson comorbidity index = 0 (vs. >0)	73%	74%	73%	74%	73%
Quality of life (EQ-5D)*‡	0.64 ± 0.20	0.64 ± 0.20	0.64 ± 0.20	0.63 ± 0.20	0.65 ± 0.19

^*The values are given as the mean and standard deviation.

^†P < 0.05 for DA groups.

^‡P < 0.05 for surgeon groups.