Shift work frequency
| Reported shift work frequency | P values | |||
| Never shift workers | Irregular shift work | Permanent shift work | ||
| N | 235 135 | 27 056 | 21 836 | |
| Age (years) | 52.9 (7.12) | 52.16 (7.09) | 51.44 (6.86) | <0.01 |
| Sex (% male) | 46.61 | 54.83 | 55.83 | <0.01 |
| BMI (kg/m2) | 27.09 (4.65) | 27.91 (4.92) | 28.23 (4.98) | <0.01 |
| Smoker (%) | <0.01 | |||
| Never | 58.11 | 53.09 | 52.97 | |
| Previous | 31.89 | 31.71 | 30.77 | |
| Current | 9.75 | 14.77 | 15.92 | |
| Smoking pack-years | 19.99 (16) | 23.59 (17.97) | 24.04 (17.51) | <0.01 |
| Daily alcohol intake (%) | 20.46 | 17.81 | 12.89 | <0.01 |
| Sleep duration (hours) | 7.05 (1.03) | 6.92 (1.21) | 6.81 (1.39) | <0.01 |
| Chronotype (%) | <0.01 | |||
| Morning | 23.34 | 24.51 | 22.55 | |
| Evening | 8.01 | 9.04 | 10.97 | |
| Ethnicity (%) | <0.01 | |||
| White British | 88.5 | 82.06 | 81.77 | |
| White other | 6.44 | 7.27 | 6.41 | |
| Mixed | 0.65 | 0.93 | 0.89 | |
| Asian | 1.71 | 3.63 | 3.54 | |
| Black | 1.39 | 3.26 | 4.6 | |
| Chinese | 0.34 | 0.62 | 0.32 | |
| Other | 0.69 | 1.85 | 2.11 | |
| Weekly work hours | 34.24 (13.19) | 37.05 (14.77) | 37.68 (12.55) | <0.01 |
| Single occupancy (%) | 15.63 | 18.49 | 18.99 | <0.01 |
| Urban area (%) | 85.98 | 89.1 | 90.42 | <0.01 |
| Townsend Index | −2.24 (−3.7 to 0.18) | −1.43 (−3.25 to 1.55) | −1.05 (−3.02 to 1.95) | <0.01 |
| High cholesterol (%) | 7.88 | 8.48 | 8.89 | <0.01 |
| Diabetes (%) | 3.22 | 4.35 | 4.58 | <0.01 |
| Hypertension (%) | 20.33 | 22.25 | 22.46 | <0.01 |
| Depression (%) | 4.61 | 4.84 | 5.21 | <0.01 |
| Cardiovascular disease (%) | 2.27 | 2.74 | 2.54 | <0.01 |
| Impaired renal function (%) | 0.09 | 0.11 | 0.11 | 0.52 |
| Defined asthma (%) | 4.93 | 5.05 | 5.12 | 0.32 |
| COPD (%) | 0.13 | 0.2 | 0.2 | <0.01 |
| Liver disease (%) | 0.53 | 0.55 | 0.47 | 0.58 |
Demographics by current shift work exposure (n=284 027). Variables are expressed as mean (±SD) or as percentages.
BMI, body mass index.