Table 2:
Contributors to wear fatigue in the 2011–2014 NHANES wrist data include those providing zero minutes of wear time and those providing an invalid day of wear based on minimum wear time criteria of ≤ 10, 12, 16, 18, and 21 hrs·day−1 for ≥4 days.
| Zero minutes wear time | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| N | Group | Day 1 | Day 2 | Day 3 | Day 4 | Day 5 | Day 6 | Day 7 | β ± SE | Δ (%) |
| 2,206 | Children | 17 (0.77%) | 35 (1.59%) | 50 (2.27%) | 62 (2.81%) | 66 (2.99%) | 91 (4.13%) | 102 (4.62%) | −11.2 ± 1.3 | −7.1 (38.8%) |
| 1,725 | Adolescents | 19 (1.10%) | 43 (2.49%) | 77 (4.46%) | 82 (4.75%) | 94 (5.45%) | 115 (6.67%) | 118 (6.84%) | −14.4 ± 1.6 | −12.4 (46.3%) |
| 6,754 | Adults | 83 (1.23%) | 129 (1.91%) | 181 (2.68%) | 259 (3.83%) | 300 (4.44%) | 334 (4.95%) | 387 (5.73%) | −11.5 ± 0.6 | −8.4 (42.2%) |
| 2,964 | Older Adults | 21 (0.71%) | 32 (1.08%) | 40 (1.35%) | 36 (1.21%) | 47 (1.59%) | 47 (1.59%) | 63 (2.13%) | −6.9 ± 0.7 | −2.4 (25.9%) |
| 13649 | Total | 140 (1.03%) | 239 (1.75%) | 348 (2.55%) | 439 (3.22%) | 507 (3.71%) | 587 (4.30%) | 670 (4.91%) | -10.7 ± 0.5 | -7.4 (41.0%) |
| Minimum Wear Criteria | ||||||||||
| Invalid Wear Days (≤10hrs·day−1) | ||||||||||
| N (%) | Group | Day 1 | Day 2 | Day 3 | Day 4 | Day 5 | Day 6 | Day 7 | β ± SE | Δ (%) |
| 2,103 (95.3%) | Children | 21 (1.00%) | 24 (1.14%) | 33 (1.57%) | 39 (1.85%) | 59 (2.81%) | 82 (3.90%) | 162 (7.70%) | −3.5 ± 0.8 | −14.8 (80.9%) |
| 1,559 (90.4%) | Adolescents | 14 (0.90%) | 35 (2.25%) | 59 (3.78%) | 53 (3.40%) | 78 (5.00%) | 111 (7.12%) | 154 (9.88%) | −5.5 ± 1.3 | −21.3 (79.5%) |
| 6,305 (93.4%) | Adults | 76 (1.21%) | 101 (1.60%) | 113 (1.79%) | 155 (2.46%) | 194 (3.08%) | 271 (4.30%) | 508 (8.06%) | −6.0 ± 0.5 | −13.9 (69.8%) |
| 2,901 (97.9%) | Older Adults | 11 (0.38%) | 10 (0.34%) | 18 (0.62%) | 19 (0.65%) | 23 (0.79%) | 43 (1.48%) | 117 (4.03%) | −4.2 ± 0.6 | −5.1 (54.9%) |
| 12,868 (94.3%) | Total | 122 (0.95%) | 170 (1.32%) | 223 (1.73%) | 266 (2.07%) | 354 (2.75%) | 507 (3.94%) | 941 (7.31%) | -5.3 ± 0.4 | -12.8 (70.8%) |
| Invalid Wear Days (≤12hrs·day−1) | ||||||||||
| N (%) | Group | Day 1 | Day 2 | Day 3 | Day 4 | Day 5 | Day 6 | Day 7 | β ± SE | Δ (%) |
| 2,079 (94.2%) | Children | 32 (1.54%) | 32 (1.54%) | 36 (1.73%) | 40 (1.92%) | 66 (3.17%) | 89 (4.28%) | 174 (8.37%) | −3.2 ± 0.6 | −15.1 (82.5%) |
| 1,534 (88.9%) | Adolescents | 22 (1.43%) | 39 (2.54%) | 55 (3.59%) | 52 (3.39%) | 87 (5.67%) | 116 (7.56%) | 179 (11.67%) | −3.8 ± 1.1 | −23.0 (85.8%) |
| 6,188 (91.6%) | Adults | 92 (1.49%) | 121 (1.96%) | 130 (2.10%) | 176 (2.84%) | 203 (3.28%) | 314 (5.07%) | 570 (9.21%) | −4.7 ± 0.4 | −15.2 (76.4%) |
| 2,891 (97.5%) | Older Adults | 15 (0.52%) | 15 (0.52%) | 22 (0.76%) | 30 (1.04%) | 32 (1.11%) | 50 (1.73%) | 141 (4.88%) | −3.3 ± 0.5 | −6.0 (64.6%) |
| 12,692 (93.0%) | Total | 161 (1.27%) | 207 (1.63%) | 243 (1.91%) | 298 (2.35%) | 388 (3.06%) | 569 (4.48%) | 1064 (8.38%) | -4.2 ± 0.3 | -13.9 (76.8%) |
| Invalid Wear Days (≤16hrs·day−1) | ||||||||||
| N (%) | Group | Day 1 | Day 2 | Day 3 | Day 4 | Day 5 | Day 6 | Day 7 | β ± SE | Δ (%) |
| 1,999 (90.6%) | Children | 30 (1.50%) | 40 (2.00%) | 37 (1.85%) | 45 (2.25%) | 64 (3.2%) | 98 (4.9%) | 193 (9.65%) | −2.2 ± 0.3 | −16.1 (88%) |
| 1,438 (83.4%) | Adolescents | 32 (2.23%) | 46 (3.20%) | 60 (4.17%) | 63 (4.38%) | 85 (5.91%) | 112 (7.79%) | 195 (13.56%) | −2.8 ± 0.6 | −24.0 (89.6%) |
| 5,870 (86.9%) | Adults | 161 (2.74%) | 155 (2.64%) | 193 (3.29%) | 230 (3.92%) | 275 (4.68%) | 390 (6.64%) | 710 (12.10%) | −2.4 ± 0.3 | −17.5 (87.9%) |
| 2,846 (96.0%) | Older Adults | 39 (1.37%) | 23 (0.81%) | 30 (1.05%) | 36 (1.26%) | 41 (1.44%) | 68 (2.39%) | 212 (7.45%) | −1.2 ± 0.3 | −8.1 (87.1%) |
| 12,153 (89.0%) | Total | 262 (2.16%) | 264 (2.17%) | 320 (2.63%) | 374 (3.08%) | 465 (3.83%) | 668 (5.50%) | 1310 (10.78%) | -2.1 ± 0.2 | -16.0 (88.4%) |
| Invalid Wear Days (≤18hrs·day−1) | ||||||||||
| N (%) | Group | Day 1 | Day 2 | Day 3 | Day 4 | Day 5 | Day 6 | Day 7 | β ± SE | Δ (%) |
| 1,974 (89.5%) | Children | 39 (1.98%) | 47 (2.38%) | 51 (2.58%) | 55 (2.79%) | 75 (3.8%) | 110 (5.57%) | 207 (10.49%) | −1.7 ± 0.3 | −16.6 (90.7%) |
| 1,397 (81.0%) | Adolescents | 39 (2.79%) | 51 (3.65%) | 58 (4.15%) | 70 (5.01%) | 89 (6.37%) | 111 (7.95%) | 210 (15.03%) | −1.5 ± 0.4 | −25.3 (94.4%) |
| 5,723 (84.7%) | Adults | 202 (3.53%) | 182 (3.18%) | 217 (3.79%) | 248 (4.33%) | 305 (5.33%) | 406 (7.09%) | 819 (14.31%) | −1.4 ± 0.2 | −18.5 (93.0%) |
| 2,821 (95.2%) | Older Adults | 59 (2.09%) | 40 (1.42%) | 34 (1.21%) | 44 (1.56%) | 51 (1.81%) | 78 (2.76%) | 257 (9.11%) | −0.6 ± 0.2 | −8.7 (93.6%) |
| 11,915 (87.3%) | Total | 339 (2.85%) | 320 (2.69%) | 360 (3.02%) | 417 (3.50%) | 520 (4.36%) | 705 (5.92%) | 1493 (12.53%) | -1.3 ± 0.1 | -16.8 (92.8%) |
| Invalid Wear Days (≤21hrs·day−1) | ||||||||||
| N (%) | Group | Day 1 | Day 2 | Day 3 | Day 4 | Day 5 | Day 6 | Day 7 | β ± SE | Δ (%) |
| 1,937 (87.8%) | Children | 59 (3.05%) | 59 (3.05%) | 63 (3.25%) | 63 (3.25%) | 91 (4.70%) | 124 (6.4%) | 285 (14.71%) | −0.6 ± 0.1 | −17.7 (96.7%) |
| 1,359 (78.8%) | Adolescents | 59 (4.34%) | 68 (5.00%) | 86 (6.33%) | 88 (6.48%) | 112 (8.24%) | 134 (9.86%) | 254 (18.69%) | −0.6 ± 0.2 | −26.2 (97.8%) |
| 5,542 (82.1%) | Adults | 282 (5.09%) | 261 (4.71%) | 271 (4.89%) | 285 (5.14%) | 375 (6.77%) | 472 (8.52%) | 996 (17.97%) | −0.5 ± 0.1 | −19.4 (97.5%) |
| 2,779 (93.8%) | Older Adults | 99 (3.56%) | 73 (2.63%) | 69 (2.48%) | 95 (3.42%) | 93 (3.35%) | 130 (4.68%) | 331 (11.91%) | −0.4 ± 0.1 | −8.9 (95.7%) |
| 11,617 (85.1%) | Total | 499 (4.30%) | 461 (3.97%) | 489 (4.21%) | 531 (4.57%) | 671 (5.78%) | 860 (7.40%) | 1866 (16.06%) | -0.5 ± 0.1 | -17.6 (97.2%) |