Table 3.

Number of days spent doing the stretching, endurance, and relaxation exercises at baseline, 6 and 18 weeks

			African American (n=29)	Hispanic (n=34)	Non- Hispanic white (n=27)	White vs. African American	White vs. Hispanic	African American vs. Hispanic
Stretching		Time 1	3.49	2.59	3.02	−0.47	0.43	−0.90
	SE		.51	.53	.48	0.69	0.74	0.67
		Time 2	5.06	4.24	4.09	−0.97	−0.14	−0.83
	SE		.56	.54	.52	0.76	0.77	0.71
		Time 3	5.83	5.30	4.81	−1.03	−0.49	−0.54
	SE		.58	.55	.54	0.76	0.79	0.73
		T2–T1	1.58	1.65	1.08	−0.50	−0.57	0.07
	p		.01	.01	.06	.56	.49	.93
		T3–T1	2.35	2.71	1.79	−0.56	−0.92	0.36
	p		<.001	<.001	.003	.53	.28	.68
Endurance		Time 1	3.51	2.63	3.03	−0.38	0.50	−0.88
	SE		.49	.50	.46	0.66	0.71	0.64
		Time 2	5.22	3.96	4.17	−1.05	0.21	−1.26
	SE		.53	.51	.49	0.72	0.74	0.67
		Time 3	5.60	5.18	5.20	−0.40	0.02	−0.42
	SE		.53	.51	.49	0.70	0.73	.0.67
		T2–T1	1.71	1.33	1.04	−0.67	−0.29	−0.37
	p		.003	.02	.05	.39	.69	.64
		T3–T1	2.09	2.55	2.07	−0.02	−0.48	0.46
	p		.001	<.001	<.001	.98	.52	.56
Relaxation		Time 1	3.15	1.83	2.30	−0.85	0.47	−1.32
	SE		.48	.49	.45	0.65	0.69	0.63
		Time 2	5.25	4.26	4.58	−0.67	0.32	−0.99
	SE		.52	.50	.48	0.71	0.72	0.66
		Time 3	5.29	5.79	5.31	0.02	−0.48	0.50
	SE		.53	.50	.47	0.68	0.70	0.67
		T2–T1	2.10	2.43	2.28	0.18	−0.15	0.33
	p		.001	<.001	<.001	.83	.85	.69
		T3–T1	2.14	3.96	3.01	0.88	−0.94	1.82
	p		.001	<.001	<.001	.29	.22	.03

Time 1 (T1) = baseline; Time 2 (T2) = 6-week follow-up; and Time 3 (T3) = 18 week follow-up.

Table entries in the first 3 columns and 3 rows for each outcome represent adjusted mean scores. Mean differences for Time 2 minus Time 1 and for Time 3 minus Time 1 and the probability for the tests of differences are given in the third and fourth rows for each outcome. Mean differences for contrasts of race/ethnicity and probabilities for the tests of differences appear in the 3 rightmost columns. The second entries in each cell are standard errors in the cells for means and Ps in the cells for mean differences. The entries in the third and fourth rows and 3 rightmost columns give the tests of the time × ethnicity interactions (the 2 degrees of freedom for ethnicity partitioned into single-d.f. interactions with time). All results are from models that adjust for participants’ age, sex, education, pain type (OA versus other), duration of pain, perceived health status, and number of co-morbidities.