Table 1 Baseline characteristics of study samples.
From: Wearable accelerometer-derived physical activity and incident disease
Baseline characteristica | Wrist-worn accelerometer sample (N = 96,244) | Self-reported activity sample (N = 456,374)b |
|---|---|---|
Mean ± SD, median (quartile 1, quartile 3), or N (%) | ||
Age | 62.4 ± 7.8 | 56.9 ± 8.1 |
Female sex | 54,169 (56.3%) | 244,928 (53.7%) |
Ethnic backgroundc | ||
White | 93,001 (96.6%) | 433,281 (94.9%) |
Asian | 1114 (1.2%) | 8829 (1.9%) |
Black | 805 (0.8%) | 6512 (1.4%) |
Mixed | 526 (0.5%) | 2646 (0.6%) |
Other/Unknown | 798 (0.8%) | 5106 (1.1%) |
Tobacco | ||
Current | 6478 (6.7%) | 46,337 (10.2%) |
Former | 34,655 (36.0%) | 158,696 (34.8%) |
Never | 55,111 (57.3%) | 251,341 (55.1%) |
Alcohol intake (g/week) | 96 (16, 176) | 80 (8, 176) |
Townsend Deprivation Index | −1.7 ± 2.8 | −1.4 ± 3.0 |
Educational attainment (years) | 15.3 ± 4.7 | 14.1 ± 4.9 |
Diet quality | ||
Poor | 30,887 (32.1%) | 156,690 (34.3%) |
Intermediate | 48,290 (50.2%) | 226,816 (49.7%) |
Good | 17,067 (17.7%) | 72,868 (16.0%) |
Anti-hypertensive medication use | 16,797 (17.5%) | 91,143 (20.0%) |
Body mass index (kg/m2) | 26.7 ± 4.5 | 27.3 ± 4.7 |
Systolic blood pressure (mmHg) | 137 ± 18 | 138 ± 19 |
Diastolic blood pressure (mmHg) | 82 ± 10 | 82 ± 10 |
Hypertension | 27,085 (28.1%) | 130,357 (28.6%) |
Diabetes | 3,196 (3.3%) | 11,552 (2.5%) |
