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Table 4 Accuracy of Sensewear Armband physical activity and sleep indexes in identifying each arthritis subgroup versus non-arthritic controls

From: Physical activity and sleep differences between osteoarthritis, rheumatoid arthritis and non-arthritic people in China: objective versus self report comparisons

  Group Classification Model
Rheumatoid Arthritis vs. Control Osteoarthritis vs. Control
Sensewear Index Wald p Wald p
 Active energy expenditure 0.04 0.849 0.03 0.858
 Vigorous activity 1.72 0.189 1.21 0.272
 Steps (Mean number per day) 8.12 0.004 5.90 0.015
 Wake after sleep onset time 0.67 0.413 4.27 0.039
Groups Rheumatoid arthritis (N = 40) Control (N = 40) Osteoarthritis (N = 40) Control (N = 40)
 Arthritis subgroups (N = 40) 33/ 40 (82.5%) 7/ 40 (17.5%) 30/ 40 (75%) 10/ 40 (25%)
 Control (N = 40) 14/ 40 (35.0%) 26/ 40 (65.0%) 13/ 40 (32.5%) 27/ 40 (67.5%)
 Overall Model: χ2 (4) = 24.007, p < 0.001 χ2 (4) = 20.541, p < 0.001
Total Correctly Classified: 73.8% (59/ 80) Total Correctly Classified: 71.3% (57/ 80)