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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