Table 1 Characteristics of study population for each wave
Wave 1 N = 11,212 | Wave 2 N = 8,685 | Wave 3 N = 8,806 | Wave 4 N = 9,877 | Wave 5 N = 9,082 | Wave 6 N = 9,165 | |
|---|---|---|---|---|---|---|
n (%)a | n (%)a | n (%)a | n (%)a | n (%)a | n (%)a | |
Age in years | ||||||
median (IQR) | 64 (56–73) | 66 (58–74) | 64 (57–74) | 65 (58–73) | 66 (60–74) | 66 (60–75) |
50–59 | 4,125 (37.5) | 2,584 (31.2) | 3,045 (35.2) | 2,889 (35.9) | 1,967 (26.9) | 2,061 (35.5) |
60–69 | 3,352 (28.5) | 2,859 (31.3) | 2,597 (30.4) | 3,508 (30.9) | 3,503 (35.8) | 3,449 (31.9) |
70–79 | 2,530 (22.6) | 2,159 (23.9) | 2,038 (21.5) | 2,359 (20.9) | 2,414 (23.5) | 2,443 (20.2) |
80–89 | 1,106 (10.0) | 988 (11.9) | 991 (10.9) | 985 (10.4) | 1,022 (11.2) | 1,005 (10.4) |
90+ | 99 (1.4) | 95 (1.7) | 135 (1.9) | 136 (1.7) | 176 (1.9) | 207 (2.0) |
Sex | ||||||
Male | 5,102 (46.4) | 3,906 (46.1) | 3,939 (46.8) | 4,420 (47.0) | 4,050 (46.8) | 4,073 (47.4) |
Female | 6,110 (53.6) | 4,779 (53.9) | 4,867 (53.2) | 5,457 (53.0) | 5,032 (53.1) | 5,092 (52.6) |
Ethnicity | ||||||
White | 4,698 (39.7) | 8,484 (97.1) | 8,563 (96.5) | 9,566 (96.0) | 8,796 (95.9) | 8,841 (94.4) |
Non-white | 139 (1.2) | 197 (2.9) | 240 (3.4) | 303 (3.9) | 282 (4.0) | 322 (5.5) |
Missing | 6,375 (59.2) | 4 (0.03) | 3 (0.03) | 8 (0.06) | 5 (0.04) | 2 (0.05) |
Total non-pension net wealth (Quintile) | ||||||
Quintile 1 (poorest quintile) | 2,122 (19.5) | 1,553 (19.5) | 1,578 (19.5) | 1,716 (19.6) | 1,567 (19.7) | 1,520 (19.6) |
Quintile 2 | 2,193 (19.5) | 1,703 (19.7) | 1,657 (19.5) | 1,882 (19.7) | 1,772 (19.6) | 1,717 (19.6) |
Quintile 3 | 2,209 (19.7) | 1,722 (19.8) | 1,714 (19.6) | 1,916 (19.4) | 1,786 (19.7) | 1,871 (19.7) |
Quintile 4 | 2,215 (19.7) | 1,756 (19.8) | 1,723 (19.5) | 1,995 (20.2) | 1,834 (19.6) | 1,881 (19.5) |
Quintile 5 (richest quintile) | 2,277 (19.7) | 1,832 (19.8) | 1,795 (19.5) | 2,071 (19.5) | 1,877 (19.6) | 1,927 (19.6) |
Missing | 196 (1.8) | 119 (1.4) | 339 (2.3) | 297 (2.3) | 246 (1.6) | 249 (1.9) |
Smoking status | ||||||
Smoker | 1,995 (17.9) | 1,350 (16.3) | 1,310 (15.6) | 1,357 (15.1) | 1,152 (13.9) | 1,101 (14.1) |
Non-Smoker | 9,217 (82.1) | 7,335 (83.7) | 7,496 (84.4) | 8,520 (84.9) | 7,930 (86.1) | 8,064 (85.9) |
Alcohol consumption in the past year | ||||||
Not at all | 1,337 (12.1) | 838 (9.6) | 816 (9.3) | 942 (9.9) | 1,014 (11.6) | 1,067 (11.6) |
Occasionally | 2,192 (19.5) | 1,207 (13.9) | 1,146 (13.0) | 1,317 (13.6) | 1,353 (15.1) | 1,282 (13.9) |
Once or twice a month | 1,157 (10.3) | 917 (10.4) | 867 (9.8) | 940 (9.5) | 929 (9.9) | 902 (9.8) |
Once or twice a week | 3,376 (30.0) | 1,940 (22.2) | 1,808 (20.5) | 2,031 (20.2) | 1,863 (20.6) | 1,800 (19.8) |
At least three days a week | 3,147 (27.9) | 2,696 (30.1) | 2,550 (28.9) | 2,999 (29.1) | 2,795 (29.8) | 2,727 (28.4) |
Missing | 3 (0.03) | 1,087 (13.4) | 1,619 (18.4) | 1,648 (17.7) | 1,128 (12.9) | 1,387 (16.4) |
Body Mass Index (kg/m2) | ||||||
Underweight (<18.5) | 23 (0.2) | 62 (0.7) | 26 (0.3) | 68 (0.7) | 39 (0.4) | 69 (0.7) |
Normal (18.5–25) | 823 (7.3) | 1,946 (22.1) | 1,185 (13.4) | 2,030 (20.0) | 1,455 (16.0) | 1,956 (20.9) |
Overweight (25.1–30) | 1,341 (11.9) | 3,132 (35.7) | 2,088 (23.7) | 3,293 (32.6) | 2,491 (27.4) | 3,029 (32.5) |
Obese (≥30.1) | 741 (6.6) | 2,085 (23.8) | 1,318 (15.0) | 2,457 (25.1) | 1,735 (19.1) | 2,327 (25.7) |
Missing | 8,284 (73.9) | 1,463 (17.7) | 4,189 (47.6) | 2,029 (21.4) | 3,362 (37.0) | 1,784 (20.0) |