Table 1.
Descriptive statistics for participants, grouped according to sleep regularity and sleep duration percentiles
| Sleep regularity percentile | 40%–60% | 60%–80% | 80%–100% | Sleep duration percentile | 40%–60% | 60%–80% | 80%–100% | |||
|---|---|---|---|---|---|---|---|---|---|---|
| 0%–20% | 20%–40% | 0%–20% | 20%–40% | |||||||
| Age (years) | ||||||||||
| M ± SD | 63.14 ± 7.8 | 62.71 ± 7.83 | 62.34 ± 7.81 | 62.52 ± 7.72 | 63.17 ± 7.75 | 63.19 ± 7.84 | 62.24 ± 7.89 | 62.24 ± 7.78 | 62.79 ± 7.74 | 63.43 ± 7.61 |
| Range | 43.89–78.72 | 43.59–79.00 | 43.69–78.84 | 43.50–78.20 | 44.10–78.88 | 43.92–79.00 | 43.50–78.88 | 43.69–78.84 | 43.90–78.61 | 44.10–78.20 |
| Sex (% male, N) | 49.58 (6048) | 46.23 (5640) | 43.67 (5318) | 42.68 (5203) | 42.24 (5164) | 57.51 (7015) | 47.65 (5813) | 42.75 (5215) | 39.15 (4776) | 37.33 (4554) |
| Ethnicity (% white, N) | 95.39 (11 573) | 96.55 (11 734) | 97.27 (11 819) | 97.92 (11 907) | 98.76 (12 033) | 94.58 (11 474) | 96.89 (11 770) | 97.55 (11 874) | 98.07 (11 922) | 98.81 (12 026) |
| Physical activity (milli-g) | ||||||||||
| M ± SD | 25.93 ± 7.97 | 27.68 ± 7.85 | 28.70 ± 7.80 | 29.42 ± 7.98 | 30.11 ± 8.08 | 28.65 ± 8.46 | 29.33 ± 8.23 | 28.93 ± 8.01 | 28.20 ± 7.75 | 26.74 ± 7.63 |
| Range | 4.83–67.81 | 6.48–69.41 | 6.46–69.21 | 7.91–68.61 | 8.05–68.64 | 5.69–68.64 | 7.34–69.41 | 4.83–67.23 | 6.46–68.64 | 5.52–69.21 |
| Employment status (% employed, N) | 58.33 (7052) | 62.26 (7546) | 62.98 (7625) | 62.07 (7522) | 58.45 (7108) | 60.81 (7360) | 63.8 (7735) | 63.73 (7726) | 59.93 (7266) | 55.82 (6766) |
| Household income bracket (M ± SD, range 1–5) | 2.65 ± 1.17 | 2.82 ± 1.16 | 2.91 ± 1.16 | 2.97 ± 1.14 | 2.94 ± 1.14 | 2.78 ± 1.17 | 2.92 ± 1.16 | 2.93 ± 1.15 | 2.87 ± 1.15 | 2.79 ± 1.14 |
| Townsend deprivation index | ||||||||||
| M ± SD | −1.33 ± 3.02 | −1.68 ± 2.82 | −1.84 ± 2.74 | −1.96 ± 2.64 | −2.14 ± 2.54 | −1.4 ± 3.00 | −1.69 ± 2.81 | −1.87 ± 2.72 | −1.94 ± 2.66 | −2.06 ± 2.60 |
| Range | −6.26–9.89 | −6.26–8.94 | −6.26–9.16 | −6.26–10.46 | −6.26–10.1 | −6.26–10.46 | −6.26–9.89 | −6.26–9.89 | −6.26–9.41 | −6.26–10.1 |
| Social visits (M ± SD, range 1–7) | 5.15 ± 1.17 | 5.19 ± 1.12 | 5.18 ± 1.09 | 5.20 ± 1.08 | 5.14 ± 1.08 | 5.13 ± 1.16 | 5.16 ± 1.12 | 5.16 ± 1.10 | 5.20 ± 1.08 | 5.22 ± 1.08 |
| Social activities (% >1 weekly, N) | 70.29 (8553) | 72.18 (8785) | 73.68 (8965) | 73.65 (8965) | 74.56 (9105) | 72.11 (8779) | 74.21 (9040) | 73.8 (8993) | 73.05 (8892) | 71.19 (8669) |
| Smoking | ||||||||||
| % previous, N | 39.10 (4751) | 36.92 (4491) | 36.29 (4412) | 35.90 (4367) | 33.84 (4127) | 39.01 (4748) | 36.46 (4433) | 35.56 (4329) | 35.71 (4343) | 35.29 (4295) |
| % current, N | 9.46 (1149) | 6.90 (839) | 5.95 (723) | 4.77 (580) | 4.22 (514) | 8.59 (1045) | 6.59 (801) | 6.15 (749) | 5.16 (628) | 4.78 (582) |
| Urbanicity (% >10 000 population, N) | 86.14 (9444) | 83.88 (9317) | 83.38 (9308) | 82.85 (9288) | 81.78 (9222) | 85.23 (9409) | 83.79 (9339) | 83.51 (9337) | 83.37 (9357) | 82.09 (9137) |
| Shift work status (% shift workers, N) | 10.37 (1252) | 8.46 (1024) | 7.00 (847) | 5.80 (702) | 5.12 (622) | 9.55 (1154) | 7.51 (910) | 6.82 (826) | 6.71 (813) | 6.14 (744) |
| SRI | ||||||||||
| M ± SD | 62.03 ± 9.54 | 75.45 ± 1.97 | 80.95 ± 1.32 | 85.22 ± 1.2 | 90.20 ± 2.11 | 72.56 ± 12.32 | 78.85 ± 9.99 | 80.58 ± 9.49 | 81.25 ± 9.17 | 80.65 ± 9.69 |
| Median (IQR) | 65.10 (58.4–68.9) | 75.62 (73.8–77.2) | 80.99 (79.8–82.1) | 85.22 (84.2–86.3) | 89.80 (88.5–91.6) | 74.59 (65.9–81.5) | 80.66 (74.2–85.8) | 82.45 (76.2–87.1) | 82.98 (77.3–87.5) | 82.63 (76.2–87.3) |
| Range | 2.46–71.65 | 71.65–78.56 | 78.56–83.16 | 83.17–87.31 | 87.32–98.53 | 9.18–97.23 | 6.05–97.29 | 9.82–98.19 | 16.57–97.59 | 2.46–98.53 |
| Sleep duration (h) | ||||||||||
| M ± SD | 6.25 ± 1.29 | 6.69 ± 1 | 6.86 ± 0.88 | 6.95 ± 0.81 | 7.07 ± 0.74 | 5.32 ± 0.72 | 6.33 ± 0.16 | 6.82 ± 0.13 | 7.29 ± 0.15 | 8.07 ± 0.47 |
| Median (IQR) | 6.32 (5.5–7.1) | 6.70 (6.1–7.3) | 6.86 (6.3–7.4) | 6.95 (6.4–7.5) | 7.07 (6.6–7.6) | 5.54 (5.1–5.8) | 6.34 (6.2–6.5) | 6.82 (6.7–6.9) | 7.28 (7.2–7.4) | 7.94 (7.7–8.3) |
| Range | 0.65–13.03 | 0.51–13.49 | 0.48–11.64 | 0.59–12.74 | 3.98–10.8 | 0.48–6.02 | 6.02–6.59 | 6.59–7.05 | 7.05–7.56 | 7.56–13.49 |