Table 1.

Multiple Regression Analysis of 6-Month Change in Average Daily Counts of 226 Participants in the IMPAACT (R²=.12)

Participant Characteristics	Sample % or Mean ± SD	B	SE	Significance
Constant		41,925.86	63,022.68	.51
Age <55y	39.8	Reference
Age 55–65y	27.9	−1666.70	11,539.90	.89
Age 66–75y	21.2	−10,469.18	14,501.12	.47
Age >75y	11.1	−7249.54	18,753.35	.70
Less than college education	16.4	8407.70	12,750.65	.51
Black race	18.1	−11,221.75	13,887.88	.42
Women	73.9	−5406.22	10,926.54	.62
Employed full or part time	51.3	4479.65	10,065.37	.66
Summer enrollment	32.3	−27,604.13	11,225.93	.02
Winter enrollment	35.8	5114.81	11,290.20	.65
Spring/fall enrollment	31.9	Reference
Rheumatoid arthritis	57.5	−13,073.44	10,774.95	.23
Current smoker	8.4	−40,182.48	17,639.90	.02
Obese	39.8	−8185.32	12,691.97	.52
Overweight	31.0	−4572.00	12,070.65	.71
Normal weight	29.2	Reference
SF-36 MCS	52.39±8.38	−752.36	592.15	.21
SF-36 PCS	44.54±8.49	1094.86	561.98	.05
Baseline average daily wear hours	14.66±1.49	−663.99	3742.44	.86
Change in average daily wear hours	−0.13±1.47	7442.66	3450.98	.03
Intervention group	47.8	11,871.52	9009.34	.19
Timed walk velocity quartile 1	24.8	Reference
Timed walk velocity quartile 2	25.2	−26,123.46	13,319.02	.05
Timed walk velocity quartile 3	25.2	−16,622.00	15,034.26	.27
Timed walk velocity quartile 4	24.8	−17,124.56	15,937.34	.28