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Table 2 Construct validity and test-retest reliability for smartphone measurements of physical activity and fitness

From: Feasibility, validity and reliability of objective smartphone measurements of physical activity and fitness in patients with cancer

Validity physical activity (n = 64)
 Accelerometer, mean number of steps/day (SD) 4057 (2883)
 Smartphone 1st week, mean number of steps/day (SD) 4033 (2842)
 ICC (95% CI, p) 0.97 (0.95–0.98, < 0.001)
Validity physical fitness (n = 45)
 6MWT hospital, mean distance walked, in meters (SD) 424 (126)
 6MWT via application, mean distance walked in meters (SD) 431 (191)
 ICC (95% CI, p) 0.47 (0.21–0.67, 0.001)
Test-retest reliability physical activity (n = 61)
 Smartphone 1st week, mean number of steps/day (SD) 4033 (2842)
 Smartphone 2nd week, mean number of steps/day (SD) 4414 (2754)
 ICC (95%CI, p) 0.91 (0.85–0.94, < 0.001)
 SEM 833
 SDD95 2309
Test-retest reliability physical fitness (n = 26)
 1st 6MWT via application, mean distance walked, in meters (SD) 408 (209)
 2nd 6MWT via application, mean distance walked, in meters (SD) 478 (182)
 ICC (95% CI, p) 0.88 (0.74–0.94, < 0.001)
 SEM 70
 SDD95 193
  1. SD standard deviation, ICC intraclass correlation coefficient, CIconfidence interval, p = significance, 6MWT = six-minute walk test, SEM = standard error of measurement, SDD95 = smallest detectable difference with 95% confidence