Table 2.
Features of physical activity and sedentary behaviour in 2012–2013 by mortality status at the end of the follow-up (February 2021) and their separate association with mortality in the Whitehall II accelerometer sub-study.
| Overall (N = 3991) | All-cause mortality |
p-valuea | Association with mortalityb |
|||
|---|---|---|---|---|---|---|
| No (N = 3581) | Yes (N = 410) | HR (95% CI) | p-value | |||
| Overall activity level | ||||||
| Mean acceleration (mg) | 31.8 (9.7) | 32.3 (9.7) | 27.2 (8.4) | <0.001 | 0.76 (0.67, 0.87) | <0.001 |
| Total duration (min/day) | ||||||
| SB | 717.9 (100.1) | 713.0 (98.5) | 760.5 (104.6) | <0.001 | 1.22 (1.10, 1.35) | <0.001 |
| LIPA | 210.3 (69.1) | 213.0 (67.6) | 186.9 (77.0) | <0.001 | 0.86 (0.78, 0.95) | 0.0027 |
| MVPA | 56.1 (38.5) | 58.2 (38.6) | 37.3 (33.0) | <0.001 | 0.74 (0.64, 0.85) | <0.001 |
| Bouts duration | ||||||
| Mean duration (min) of activity bout of | ||||||
| SB | 11.5 (5.9) | 11.1 (5.2) | 14.3 (9.8) | <0.001 | 1.07 (1.02, 1.14) | 0.011 |
| LIPA | 2.4 (0.4) | 2.4 (0.4) | 2.4 (0.4) | 0.118 | 0.94 (0.86, 1.04) | 0.22 |
| MVPA | 2.3 (0.9) | 2.3 (0.9) | 2.0 (1.1) | <0.001 | 0.87 (0.77, 0.99) | 0.03 |
| Time (min/day) in <10 min bouts of | ||||||
| SB | 147.1 (41.0) | 148.6 (40.1) | 134.6 (45.8) | <0.001 | 0.89 (0.81, 0.98) | 0.023 |
| LIPA | 184.0 (54.1) | 186.4 (52.7) | 162.9 (61.2) | <0.001 | 0.85 (0.77, 0.93) | 0.001 |
| MVPA | 43.4 (27.6) | 45.0 (27.5) | 30.0 (24.7) | <0.001 | 0.75 (0.65, 0.86) | <0.001 |
| Time (min/day) in ≥10 min bouts of | ||||||
| LIPA | 26.4 (21.3) | 26.6 (21.2) | 24.0 (21.6) | 0.02 | 0.93 (0.84, 1.03) | 0.16 |
| MVPA | 12.7 (17.2) | 13.3 (17.5) | 7.3 (12.5) | <0.001 | 0.84 (0.72, 0.98) | 0.023 |
| Time (min/day) in 10–29.9 min bouts of | ||||||
| SB | 185.7 (45.3) | 187.4 (44.4) | 171.0 (50.1) | <0.001 | 0.90 (0.82, 0.99) | 0.031 |
| Time (min/day) in ≥30 min bouts of | ||||||
| SB | 385.0 (143.0) | 377.0 (138.3) | 454.9 (163.8) | <0.001 | 1.22 (1.11, 1.34) | <0.001 |
| Frequency | ||||||
| Number (N/day) of bouts of | ||||||
| SB | 71.8 (16.0) | 72.5 (15.5) | 66.2 (18.6) | <0.001 | 0.87 (0.80, 0.96) | 0.005 |
| LIPA | 86.0 (21.6) | 87.1 (21.0) | 76.3 (24.4) | <0.001 | 0.83 (0.75, 0.92) | <0.001 |
| MVPA | 23.2 (13.6) | 24.0 (13.4) | 16.6 (12.7) | <0.001 | 0.76 (0.67, 0.87) | <0.001 |
| Number of days with ≥30 min of MVPA | 4.5 (2.5) | 4.7 (2.4) | 3.1 (2.8) | <0.001 | 0.79 (0.71, 0.88) | <0.001 |
| Intensity distribution | ||||||
| Intensity intercept | 12.4 (0.7) | 12.3 (0.6) | 12.7 (0.7) | <0.001 | 1.20 (1.08, 1.34) | <0.001 |
| Intensity gradient | −2.08 (0.22) | −2.07 (0.21) | −2.20 (0.25) | <0.001 | 0.82 (0.74, 0.91) | <0.001 |
| Timingc | ||||||
| Timing of PA (hours) | 10 h 12 min (1 h 36 min) | 10 h 12 min (1 h 36 min) | 10 h 0 min (1 h 48 min) | 0.01 | 0.96 (0.87, 1.06) | 0.41 |
Data are mean (standard deviation).
Abbreviations: HR: hazard ratio; CI: confidence interval; SB: sedentary behaviour; LIPA: light-intensity physical activity; MVPA: moderate-to-vigorous physical activity; PA: physical activity.
a
Estimated using Student's t-test.
b
Associations of PA and SB features with mortality risk (HR for one standard deviation increment) were examined in separate models adjusted for sociodemographic, behavioural, health-related factors.
c
Timing of five most active hours during the waking period.