Table 1.
Characteristics of STEP-KOA Participants, Overall and By Arm
| Characteristic | Total Sample (N=345) Mean ± SD or N (%) |
STEP-KOA (N=230) Mean ± SD or N (%) |
AE Control (N=115) Mean ± SD or N (%) |
|---|---|---|---|
| Demographic and Clinical Characteristics | |||
| Age | 60.0 (10.3) | 59.9 (9.9) | 60.2 (11.1) |
| Female | 53 (15.4) | 36 (15.7) | 17 (14.8) |
| Non-White Race* | 229 (67.3) | 155 (68.3) | 74 (65.5) |
| Hispanic ethnicity | 8 (2.3) | 4 (1.7) | 4 (3.5) |
| Some education above high school | 275 (79.7) | 184 (80.0) | 91 (79.1) |
| Working (part or full time) | 124 (35.9) | 81 (35.2) | 43 (37.4) |
| Married or living with partner | 217 (62.9) | 149 (64.8) | 68 (59.1) |
| Low Perceived Income§ | 78 (22.6) | 56 (24.3) | 22(19.1) |
| Comfort with Internet Use† | 4.3(1.1) | 4.3(1.1) | 4.3(1.2) |
| Greenville VA Healthcare Center Patient‡ | 76(22.0) | 50 (21.7) | 26 (22.6) |
| Body Mass Index (kg/m2) | 33.9 (7.4) | 33.9 (7.5) | 33.9 (7.1) |
| Number of Self-Reported Comorbidities^ | 3.90 (1.6) | 3.9 (1.6) | 3.9 (1.6) |
| Fair or Poor Self-Rated Health | 101 (29.3) | 65 (28.3) | 36 (31.3) |
| Duration of Arthritis Symptoms (years) | 16.4 (11.2) | 16.3 (11.6) | 16.6 (12.4) |
| Primary and Secondary Outcomes | |||
| WOMAC Total (Range 0–96) | 47.5 (16.3) | 47.8 (16.6) | 46.8 (15.9) |
| WOMAC Pain (Range 0–20) | 9.9 (3.4) | 10.0 (3.4) | 9.7 (3.5) |
| WOMAC Function (Range 0–68) | 33.3 (12.4) | 33.5 (12.7) | 32.8 (12.0) |
| 30-Second Chair Stand Test (# stands) | 7.8 (3.8) | 7.8 (3.7) | 7.8 (4.0) |
| 40m Fast-Paced Walk (seconds) | 40.7 (16.9) | 40.1 (17.4) | 40.1 (16.0) |
| Timed Up-and-Go Test (seconds) | 12.3 (5.9) | 12.3 (5.9) | 12.3 (5.8) |
| Stair Climb Test (seconds) | 9.2 (4.8) | 9.1 (4.6) | 9.3 (5.2) |
| 6-Minute Walk Test (meters) | 308 (131) | 306 (135) | 310 (125) |
| Physical Activity for the Elderly Scale | 148 (91.2) | 151 (94.0) | 142 (85.4) |
Majority African American: Total N=219, STEP=KOA N=149, AE N=70
Self-report of “just meet basic expenses” or “don’t even have enough to meet basic expenses.”
1=”not at all” to 5=”very” comfortable
Other participants’ primary clinical site was the Durham VA Healthcare Center
From Self-Administered Comorbidity Questionnaire (Sangha et al., 2003); list of 13 medical conditions plus up to 2 optional “other” conditions WOMAC = Western Ontario and McMaster Universities Osteoarthritis Index
Missing data: 2 participants missing age (STEP-KOA n=2), 5 missing race (STEP-KOA n=3, AE Control n=2), 4 missing ethnicity (STEP-KOA n=2, AE Control n=2), 4 missing perceived income (STEP-KOA n=3, AE Control n=1), 28 missing comfort with internet use (STEP-KOA n=19, AE Control n=9), 1 missing self-rated health (STEP-KOA n=1), 3 missing duration of arthritis symptoms (STEP-KOA n=1, AE Control n=2). 1 participant missing WOMAC total (STEP-KOA n=1), 1 missing chair stand test (STEP-KOA n=1), 3 missing 40 meter walk (STEP-KOA n=1, AE Control n=2), 2 missing timed up-and-go test (AE Control n=2), 22 missing stair climb test (STEP-KOA n=16, AE Control n=6), 1 missing 6-minute walk test (STEP-KOA n=1), and 1 missing PASE total (STEP-KOA n=1)
Normative values for physical function tests: 30-second chair stand: 13–14 stands in adults age 60–79; 40m walk test: 19–23 seconds in adults age 60–79; Timed Up-and Go: 8–9 seconds in adults age 60–79;Stair climb test:8.7–10.2 for healthy men and women; 6 minute walk test: 471–572m for adults age 60–79