Table 1.
Study sample characteristics
| Variable | Complete data (n=415 666) |
Incomplete data (n=86 877) |
P values* | d |
| Mean age, years (SD) | 56.64 (8.14) | 56.01 (7.85) | <0.0001 | 0.08 |
| Sex, n (%) | <0.0001 | 0.02 | ||
| Female | 225 456 (54.2%) | 47 979 (55.2%) | ||
| Male | 190 210 (45.8%) | 38 898 (44.8%) | ||
| Race, n (%) | <0.0001 | 0.15 | ||
| Mixed/Other | 5284 (1.3%) | 2233 (2.6%) | ||
| Asian | 8267 (2.0%) | 3184 (3.7%) | ||
| Black | 5439 (1.3%) | 2618 (3.0%) | ||
| White | 395 506 (95.2%) | 77 235 (88.9%) | ||
| Do not know/Prefer not to answer | 1170 (0.3%) | 1607 (1.9%) | ||
| Education, n (%) | <0.0001 | 0.19 | ||
| College | 144 599 (34.8%) | 16 585 (19.1%) | ||
| No college | 268 275 (64.5%) | 62 947 (72.5%) | ||
| Prefer not to answer | 2792 (0.7%) | 2699 (3.1%) | ||
| Missing | 0 (0.00%) | 4646 (5.4%) | ||
| Employment status, n (%) | <0.0001 | 0.26 | ||
| Employed | 256 588 (61.7%) | 30 593 (35.2%) | ||
| Unemployed | 12 079 (2.9%) | 1780 (2.1%) | ||
| Retired | 146 999 (35.4%) | 19 998 (23.0%) | ||
| None of the above/Prefer not to answer | 0 (0.00%) | 4886 (5.6%) | ||
| Missing | 0 (0.00%) | 29 620 (34.1%) | ||
| Shift work, n (%) | <0.0001 | 0.14 | ||
| Yes | 42 285 (10.2%) | 7266 (8.4%) | ||
| No | 372 902 (89.7%) | 44 865 (51.6%) | ||
| Do not know/Prefer not to answer | 479 (0.1%) | 240 (0.3%) | ||
| Missing | 0 (0.00%) | 34 506 (39.7%) | ||
| Residence, n (%) | <0.0001 | 0.13 | ||
| Urban | 355 222 (85.5%) | 73 587 (84.7%) | ||
| Rural | 60 429 (14.5%) | 8232 (9.5%) | ||
| No postal code provided | 15 (0.00%) | 3 (0.00%) | ||
| Missing | 0 (0.00%) | 5055 (5.8%) | ||
| Season of assessment, n (%) | <0.0001 | 0.04 | ||
| Fall (September–November) | 100 142 (24.1%) | 19 257 (22.2%) | ||
| Winter (December–February) | 86 848 (20.9%) | 17 815 (20.5%) | ||
| Spring (March–May) | 119 536 (28.8%) | 26 949 (31.0%) | ||
| Summer (June–August) | 109 140 (26.3%) | 22 853 (26.3%) | ||
| Missing | 0 (0.00%) | 3 (0.00%) | ||
| Mean TV Use, hours/day (SD) | 2.69 (1.6) | 3.35 (2.1) | <0.0001 | 0.40 |
| Mean computer use, hours/day (SD) | 1.08 (1.4) | 1.10 (1.5) | 0.0009 | 0.01 |
| Mean driving time, hours/day (SD) | 0.99 (1.2) | 0.89 (1.3) | <0.0001 | 0.08 |
| Mean overall sedentary behaviour, hours/day (SD) | 4.76 (2.3) | 4.98 (2.8) | <0.0001 | 0.09 |
| Mean total physical activity, excess MET-hours/week (SD) | 31.78 (33.0) | 27.65 (32.0) | <0.0001 | 0.13 |
| Categorised total physical activity, n (%) | <0.0001 | 0.18 | ||
| Low activity (<10 excess MET-hours/week) | 109 215 (26.3%) | 13 809 (15.9%) | ||
| Moderate activity (10–49.9 excess MET-hours/week) | 223 597 (53.8%) | 19 142 (22.0%) | ||
| High activity (≥50 excess MET-hours/week) | 82 854 (19.9%) | 6436 (7.4%) | ||
| Missing | 0 (0.00%) | 47 490 (54.7%) |
Column percentages do not always add up to 100% because of rounding.
*P values based on χ² tests for categorical variables and two-sample t-tests for continuous variables.
d, Cohen’s d effect size; MET, metabolic equivalents; n, frequency.