Table 1.

Demographic and baseline characteristics.

Subjects	No pain	Mild pain	Moderate pain	Severe pain	Combine
Age	n = 216	n = 199	n = 100	n = 52	n = 567
Mean (SD)	62.2 (9.0)	61.2 (8.7)	60.9 (9.2)	60.1 (8.2)	61.4 (8.9)
Min, max	45–79	45–78	45–79	45–74	45–79
Race	n = 216	n = 199	n = 100	n = 52	n = 567
White	179 (82.8%)	162 (81.4%)	73 (73.0%)	32 (61.5%)	446 (78.7%)
Black	30 (13.9%)	33 (16.6%)	24 (24.0%)	18 (34.6%)	105 (18.5%)
Asian or other	7 (0.03%)	4 (2%)	3 (3%)	2 (3.9%)	16 (2.8%)
BMI (m/kg2)	n = 216	n = 199	n = 99	n = 52	n = 566
Mean (SD)	29.8 (4.6)	31.1 (4.5)	31.3 (5.0)	32.4 (5.3)	30.8 (4.8)
Min, max	18.6 to 42.5	20 to 43.9	20.6 to 46.7	18.8 to 46	18.6 to 46.7
Use of NSAIDs at baseline	n = 216	n = 199	n = 100	n = 52	n = 567
Yes	50 (23.1%)	48 (24.1%)	32 (32.0%)	15 (28.9%)	145 (25.6%)
No	166 (76.9%)	151 (75.9%)	68 (68.0%)	37 (71.1%)	422 (74.4%)
Comorbidity	n = 216	n = 198	n = 98	n = 51	n = 563
Yes	50 (23.1%)	48 (24.2%)	33 (33.7%)	21 (41.2%)	155 (27.5%)
No	166 (76.9%)	150 (75.8%)	65 (66.3%)	30 (58.8%)	408 (72.5%)
Risk factor	n = 215	n = 199	n = 100	n = 52	n = 566
Yes	161 (74.9%)	147 (73.9%)	72 (72%)	40 (76.9%)	420 (74.2%)
No	54 (25.1%)	52 (26.1%)	28 (28%)	12 (23.1%)	146 (25.8%)
Gender	n = 216	n = 199	n = 100	n = 52	n = 567
Male	94 (43.5%)	78 (39.2%)	45 (45.0%)	15 (28.8%)	232 (40.9%)
Female	122 (56.4%)	121 (60.8%)	55 (55.0%)	37 (71.2%)	335 (59.1%)

*BMI denotes body mass index, NSAIDS denotes nonsteroidal anti-inflammatory drugs.