Table 1 ICC values and number of days needed to achieve 0.7, 0.8, and 0.9 reliability estimates for physical activity and sedentary time outcomes
Minimum Wear Time Criteria (Hours) | Single Day ICC | Number of days to achieve reliabilities of | Number (%) of children meeting reliabilities of | ||||
|---|---|---|---|---|---|---|---|
95% CI | 0.7 | 0.8 | 0.9 | 0.7 | 0.8 | ||
Light Physical Activity | |||||||
1 | 0.47 | 0.45, 0.49 | 2.6 | 4.5 | 10.1 | 2646 (96.4) | 2475 (90.2) |
2 | 0.47 | 0.45, 0.49 | 2.6 | 4.5 | 10.2 | 2646 (96.4) | 2475 (90.2) |
3 | 0.47 | 0.45, 0.49 | 2.6 | 4.5 | 10.1 | 2639 (96.1) | 2472 (90.1) |
4 | 0.47 | 0.45, 0.49 | 2.6 | 4.5 | 10.2 | 2639 (96.1) | 2472 (90.1) |
5 | 0.47 | 0.45, 0.49 | 2.7 | 4.5 | 10.2 | 2639 (96.1) | 2471 (90.0) |
6 | 0.47 | 0.45, 0.49 | 2.6 | 4.5 | 10.2 | 2639 (96.1) | 2469 (89.9) |
7 | 0.46 | 0.44, 0.48 | 2.7 | 4.7 | 10.5 | 2639 (96.1) | 2469 (89.9) |
8 | 0.45 | 0.43, 0.47 | 2.8 | 4.8 | 10.9 | 2639 (96.1) | 2468 (89.9) |
9 | 0.44 | 0.42, 0.46 | 3.0 | 5.1 | 11.5 | 2639 (96.1) | 2332 (85.0) |
10 | 0.44 | 0.42, 0.46 | 3.0 | 5.1 | 11.4 | 2639 (96.1) | 2332 (85.0) |
11 | 0.44 | 0.42, 0.46 | 2.9 | 5.0 | 11.3 | 2637 (96.1) | 2466 (89.8) |
12 | 0.44 | 0.43, 0.46 | 2.9 | 5.0 | 11.3 | 2637 (96.1) | 2466 (89.8) |
13 | 0.44 | 0.42, 0.46 | 3.0 | 5.1 | 11.4 | 2637 (96.1) | 2332 (85.0) |
14 | 0.44 | 0.42, 0.46 | 3.0 | 5.2 | 11.6 | 2637 (96.1) | 2332 (85.0) |
15 | 0.43 | 0.41, 0.45 | 3.1 | 5.2 | 11.8 | 2565 (93.4) | 2332 (85.0) |
16 | 0.43 | 0.41, 0.45 | 3.1 | 5.3 | 11.9 | 2564 (93.4) | 2330 (84.9) |
17 | 0.43 | 0.41, 0.45 | 3.0 | 5.2 | 11.7 | 2635 (96.0) | 2330 (84.9) |
18 | 0.44 | 0.42, 0.46 | 3.0 | 5.1 | 11.5 | 2634 (96.0) | 2329 (84.8) |
19 | 0.44 | 0.42, 0.46 | 3.0 | 5.1 | 11.5 | 2634 (96.0) | 2329 (84.8) |
20 | 0.45 | 0.43, 0.47 | 2.9 | 5.0 | 11.2 | 2634 (96.0) | 2463 (89.7) |
21 | 0.45 | 0.43, 0.47 | 2.8 | 4.9 | 11.0 | 2634 (96.0) | 2462 (89.7) |
22 | 0.45 | 0.43, 0.47 | 2.8 | 4.9 | 10.9 | 2634 (96.0) | 2462 (89.7) |
23 | 0.46 | 0.43, 0.48 | 2.8 | 4.8 | 10.7 | 2633 (95.9) | 2462 (89.7) |
24 | 0.46 | 0.44, 0.48 | 2.8 | 4.7 | 10.6 | 2633 (95.9) | 2462 (89.7) |
Moderate Physical Activity | |||||||
1 | 0.47 | 0.45, 0.49 | 2.6 | 4.5 | 10.2 | 2649 (96.5) | 2479 (90.3) |
2 | 0.47 | 0.45, 0.49 | 2.6 | 4.5 | 10.1 | 2649 (96.5) | 2479 (90.3) |
3 | 0.47 | 0.45, 0.49 | 2.7 | 4.5 | 10.2 | 2642 (96.2) | 2476 (90.2) |
4 | 0.46 | 0.45, 0.48 | 2.7 | 4.6 | 10.4 | 2642 (96.2) | 2476 (90.2) |
5 | 0.46 | 0.45, 0.48 | 2.7 | 4.6 | 10.4 | 2642 (96.2) | 2475 (90.2) |
6 | 0.46 | 0.44, 0.48 | 2.7 | 4.7 | 10.5 | 2642 (96.2) | 2473 (90.1) |
7 | 0.46 | 0.44, 0.48 | 2.8 | 4.7 | 10.6 | 2642 (96.2) | 2473 (90.1) |
8 | 0.45 | 0.43, 0.47 | 2.8 | 4.9 | 11.0 | 2642 (96.2) | 2472 (90.1) |
9 | 0.45 | 0.43, 0.46 | 2.9 | 5.0 | 11.2 | 2642 (96.2) | 2472 (90.1) |
10 | 0.45 | 0.43, 0.46 | 2.9 | 5.0 | 11.2 | 2642 (96.2) | 2472 (90.1) |
11 | 0.44 | 0.42, 0.46 | 3.0 | 5.1 | 11.5 | 2640 (96.2) | 2337 (85.1) |
12 | 0.43 | 0.42, 0.45 | 3.0 | 5.2 | 11.7 | 2640 (96.2) | 2337 (85.1) |
13 | 0.43 | 0.41, 0.45 | 3.1 | 5.3 | 11.9 | 2567 (93.5) | 2337 (85.1) |
14 | 0.43 | 0.41, 0.45 | 3.1 | 5.3 | 11.9 | 2567 (93.5) | 2337 (85.1) |
15 | 0.43 | 0.41, 0.45 | 3.1 | 5.3 | 12.0 | 2567 (93.5) | 2337 (85.1) |
16 | 0.43 | 0.41, 0.45 | 3.1 | 5.3 | 11.8 | 2566 (93.5) | 2335 (85.1) |
17 | 0.43 | 0.41, 0.45 | 3.0 | 5.2 | 11.7 | 2638 (96.1) | 2335 (85.1) |
18 | 0.44 | 0.42, 0.46 | 3.0 | 5.1 | 11.5 | 2637 (96.1) | 2334 (85.0) |
19 | 0.44 | 0.42, 0.46 | 2.9 | 5.0 | 11.4 | 2637 (96.1) | 2467 (89.9) |
20 | 0.44 | 0.42, 0.46 | 3.0 | 5.1 | 11.5 | 2637 (96.1) | 2334 (85.0) |
21 | 0.44 | 0.42, 0.46 | 2.9 | 5.0 | 11.3 | 2637 (96.1) | 2466 (89.8) |
22 | 0.44 | 0.42, 0.47 | 2.9 | 5.0 | 11.3 | 2637 (96.1) | 2466 (89.8) |
23 | 0.44 | 0.42, 0.46 | 3.0 | 5.1 | 11.4 | 2636 (96.0) | 2332 (85.0) |
24 | 0.44 | 0.42, 0.46 | 2.9 | 5.0 | 11.4 | 2636 (96.0) | 2466 (89.8) |
Moderate to Vigorous Physical Activity | |||||||
1 | 0.46 | 0.45, 0.48 | 2.7 | 4.6 | 10.4 | 2649 (96.5) | 2479 (90.3) |
2 | 0.46 | 0.44, 0.48 | 2.7 | 4.7 | 10.5 | 2649 (96.5) | 2479 (90.3) |
3 | 0.46 | 0.44, 0.48 | 2.7 | 4.7 | 10.5 | 2642 (96.2) | 2476 (90.2) |
4 | 0.46 | 0.45, 0.48 | 2.7 | 4.6 | 10.4 | 2642 (96.2) | 2476 (90.2) |
5 | 0.46 | 0.44, 0.48 | 2.7 | 4.7 | 10.6 | 2642 (96.2) | 2475 (90.2) |
6 | 0.46 | 0.44, 0.48 | 2.8 | 4.7 | 10.6 | 2642 (96.2) | 2473 (90.1) |
7 | 0.45 | 0.44, 0.47 | 2.8 | 4.8 | 10.8 | 2642 (96.2) | 2473 (90.1) |
8 | 0.45 | 0.43, 0.47 | 2.8 | 4.9 | 10.9 | 2642 (96.2) | 2472 (90.1) |
9 | 0.45 | 0.43, 0.47 | 2.9 | 5.0 | 11.1 | 2642 (96.2) | 2472 (90.1) |
10 | 0.44 | 0.42, 0.46 | 3.0 | 5.1 | 11.4 | 2642 (96.2) | 2337 (85.1) |
11 | 0.44 | 0.42, 0.46 | 3.0 | 5.1 | 11.6 | 2640 (96.2) | 2337 (85.1) |
12 | 0.43 | 0.41, 0.45 | 3.1 | 5.3 | 11.8 | 2568 (93.6) | 2337 (85.1) |
13 | 0.43 | 0.41, 0.45 | 3.1 | 5.3 | 11.9 | 2567 (93.5) | 2337 (85.1) |
14 | 0.43 | 0.41, 0.45 | 3.1 | 5.3 | 12.0 | 2567 (93.5) | 2337 (85.1) |
15 | 0.43 | 0.41, 0.45 | 3.1 | 5.2 | 11.8 | 2567 (93.5) | 2337 (85.1) |
16 | 0.43 | 0.41, 0.45 | 3.1 | 5.3 | 11.9 | 2566 (93.5) | 2335 (85.1) |
17 | 0.44 | 0.42, 0.46 | 3.0 | 5.1 | 11.6 | 2638 (96.1) | 2335 (85.1) |
18 | 0.44 | 0.42, 0.46 | 3.0 | 5.1 | 11.4 | 2637 (96.1) | 2334 (85.0) |
19 | 0.44 | 0.42, 0.46 | 2.9 | 5.0 | 11.3 | 2637 (96.1) | 2467 (89.9) |
20 | 0.44 | 0.42, 0.46 | 3.0 | 5.1 | 11.4 | 2637 (96.1) | 2334 (85.0) |
21 | 0.44 | 0.42, 0.46 | 2.9 | 5.0 | 11.3 | 2637 (96.1) | 2466 (89.8) |
22 | 0.45 | 0.43, 0.47 | 2.9 | 5.0 | 11.2 | 2637 (96.1) | 2466 (89.8) |
23 | 0.44 | 0.42, 0.46 | 3.0 | 5.1 | 11.4 | 2636 (96.0) | 2332 (85.0) |
24 | 0.44 | 0.42, 0.47 | 2.9 | 5.0 | 11.3 | 2636 (96.0) | 2466 (89.8) |
Vigorous Physical Activity | |||||||
1 | 0.39 | 0.37, 0.41 | 3.6 | 6.2 | 14.0 | 2570 (93.6) | 2144 (78.1) |
2 | 0.39 | 0.37, 0.41 | 3.6 | 6.2 | 14.0 | 2570 (93.6) | 2144 (78.1) |
3 | 0.39 | 0.37, 0.41 | 3.6 | 6.2 | 13.9 | 2569 (93.6) | 2142 (78.0) |
4 | 0.40 | 0.38, 0.41 | 3.6 | 6.1 | 13.7 | 2569 (93.6) | 2142 (78.0) |
5 | 0.39 | 0.37, 0.41 | 3.6 | 6.2 | 14.0 | 2569 (93.6) | 2142 (78.0) |
6 | 0.39 | 0.37, 0.41 | 3.6 | 6.2 | 13.9 | 2569 (93.6) | 2139 (77.9) |
7 | 0.39 | 0.38, 0.41 | 3.6 | 6.1 | 13.8 | 2569 (93.6) | 2139 (77.9) |
8 | 0.39 | 0.37, 0.41 | 3.6 | 6.2 | 13.9 | 2569 (93.6) | 2129 (77.6) |
9 | 0.39 | 0.37, 0.41 | 3.6 | 6.2 | 14.0 | 2569 (93.6) | 2129 (77.6) |
10 | 0.40 | 0.38, 0.42 | 3.5 | 6.1 | 13.7 | 2569 (93.6) | 2129 (77.6) |
11 | 0.40 | 0.39, 0.42 | 3.4 | 5.9 | 13.3 | 2568 (93.6) | 2328 (84.8) |
12 | 0.41 | 0.39, 0.43 | 3.4 | 5.9 | 13.2 | 2568 (93.6) | 2328 (84.8) |
13 | 0.41 | 0.39, 0.43 | 3.4 | 5.8 | 13.0 | 2567 (93.5) | 2328 (84.8) |
14 | 0.42 | 0.40, 0.44 | 3.3 | 5.6 | 12.6 | 2567 (93.5) | 2328 (84.8) |
15 | 0.42 | 0.40, 0.44 | 3.3 | 5.6 | 12.6 | 2567 (93.5) | 2328 (84.8) |
16 | 0.42 | 0.40, 0.44 | 3.2 | 5.4 | 12.2 | 2566 (93.5) | 2326 (84.7) |
17 | 0.43 | 0.41, 0.45 | 3.0 | 5.2 | 11.7 | 2637 (96.1) | 2326 (84.7) |
18 | 0.44 | 0.42, 0.46 | 3.0 | 5.1 | 11.4 | 2636 (96.0) | 2325 (84.7) |
19 | 0.44 | 0.42, 0.46 | 3.0 | 5.1 | 11.6 | 2636 (96.0) | 2325 (84.7) |
20 | 0.44 | 0.42, 0.46 | 2.9 | 5.0 | 11.3 | 2636 (96.0) | 2462 (89.7) |
21 | 0.44 | 0.42, 0.46 | 2.9 | 5.0 | 11.3 | 2636 (96.0) | 2461 (89.7) |
22 | 0.45 | 0.42, 0.47 | 2.9 | 5.0 | 11.2 | 2636 (96.0) | 2461 (89.7) |
23 | 0.44 | 0.42, 0.46 | 3.0 | 5.1 | 11.4 | 2635 (96.0) | 2323 (84.6) |
24 | 0.44 | 0.42, 0.46 | 3.0 | 5.1 | 11.4 | 2635 (96.0) | 2323 (84.6) |
Sedentary Time | |||||||
1 | 0.42 | 0.40, 0.44 | 3.2 | 5.4 | 12.3 | 2318 (84.4) | 2045 (74.5) |
2 | 0.43 | 0.41, 0.45 | 3.1 | 5.4 | 12.1 | 2318 (84.4) | 2045 (74.5) |
3 | 0.42 | 0.40, 0.44 | 3.2 | 5.4 | 12.2 | 2317 (84.4) | 2045 (74.5) |
4 | 0.42 | 0.41, 0.44 | 3.2 | 5.4 | 12.2 | 2317 (84.4) | 2045 (74.5) |
5 | 0.43 | 0.41, 0.45 | 3.1 | 5.3 | 12.0 | 2317 (84.4) | 2045 (74.5) |
6 | 0.43 | 0.41, 0.45 | 3.1 | 5.3 | 12.0 | 2317 (84.4) | 2045 (74.5) |
7 | 0.43 | 0.41, 0.44 | 3.2 | 5.4 | 12.2 | 2317 (84.4) | 2045 (74.5) |
8 | 0.43 | 0.41, 0.45 | 3.1 | 5.4 | 12.0 | 2317 (84.4) | 2043 (74.4) |
9 | 0.42 | 0.40, 0.44 | 3.2 | 5.5 | 12.3 | 2317 (84.4) | 2043 (74.4) |
10 | 0.42 | 0.40, 0.44 | 3.2 | 5.6 | 12.5 | 2317 (84.4) | 2043 (74.4) |
11 | 0.41 | 0.39, 0.43 | 3.4 | 5.8 | 13.0 | 2317 (84.4) | 2043 (74.4) |
12 | 0.40 | 0.38, 0.42 | 3.4 | 5.9 | 13.3 | 2317 (84.4) | 2043 (74.4) |
13 | 0.40 | 0.38, 0.42 | 3.5 | 6.0 | 13.6 | 2316 (84.4) | 2042 (74.4) |
14 | 0.39 | 0.37, 0.41 | 3.6 | 6.3 | 14.1 | 2316 (84.4) | 1805 (65.8) |
15 | 0.37 | 0.35, 0.39 | 4.0 | 6.8 | 15.3 | 2316 (84.4) | 1805 (65.8) |
16 | 0.35 | 0.33, 0.37 | 4.3 | 7.4 | 16.6 | 2191 (79.8) | 1114 (40.6) |
17 | 0.35 | 0.33, 0.37 | 4.4 | 7.5 | 16.8 | 2191 (79.8) | 1114 (40.6) |
18 | 0.36 | 0.34, 0.38 | 4.1 | 7.0 | 15.8 | 2191 (79.8) | 1805 (65.8) |
19 | 0.37 | 0.35, 0.40 | 3.9 | 6.7 | 15.1 | 2316 (84.4) | 1805 (65.8) |
20 | 0.38 | 0.36, 0.40 | 3.8 | 6.5 | 14.6 | 2316 (84.4) | 1805 (65.8) |
21 | 0.39 | 0.36, 0.41 | 3.7 | 6.4 | 14.3 | 2316 (84.4) | 1805 (65.8) |
22 | 0.39 | 0.37, 0.41 | 3.6 | 6.2 | 14.0 | 2316 (84.4) | 1805 (65.8) |
23 | 0.40 | 0.37, 0.42 | 3.6 | 6.1 | 13.7 | 2316 (84.4) | 1805 (65.8) |
24 | 0.41 | 0.38, 0.43 | 3.4 | 5.8 | 13.1 | 2316 (84.4) | 2039 (74.3) |