Table 1.
Summary characteristics of participants at each LBC1936 wave
| Variables | Wave 1 2004–2007 | Wave 2 2007–2010 | Wave 3 2011–2013 | Wave 4 2014–2017 | Wave 5 2017–2019 |
|---|---|---|---|---|---|
| Participants, n | 1,091 | 866 | 697 | 550 | 431 |
| Lost to follow-up since previous wave, n | 0 | 225 | 169 | 147 | 119 |
| Age, years, mean (SD) | 69.5 (0.8) | 72.5 (0.7) | 76.3 (0.7) | 79.3 (0.6) | 82.0 (0.5) |
| Female, n (%) | 543 (49.8) | 418 (48.3) | 337 (48.4) | 275 (50) | 222 (52) |
| Type of residence, n (%) | |||||
| Own home | 987 (90.5) | 791 (91.3) | 637 (91.4) | 506 (92.0) | 400 (92.8) |
| Rented accommodation | 89 (8.2) | 67 (7.7) | 49 (7.0) | 32 (5.8) | 24 (5.6) |
| Residential home | 6 (0.5) | 6 (0.7) | 2 (0.3) | 1 (0.2) | 1 (0.2) |
| Nursing home | 4 (0.4) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) |
| Other | 5 (0.4) | 2 (0.2) | 9 (1.2) | 11 | 6 (1.4) |
| FI, mean (SD) | 0.16 (0.1) | 0.18 (0.1) | 0.20 (0.1) | 0.21 (2.0%) | 0.22 (0.1) |
| Social class, n (%) | |||||
| Professional | 194 (17.8) | 170 (19.6) | 144 (20.7) | 127 (23.1) | 102 (23.7) |
| Managerial | 412 (37.8) | 331 (38.2) | 271 (38.9) | 217 (39.5) | 171 (39.7) |
| Skilled nonmanual | 249 (22.8) | 188 (21.7) | 143 (20.5) | 109 (19.8) | 93 (21.6) |
| Skilled manual | 191 (17.5) | 144 (16.6) | 111 (15.9) | 78 (14.2) | 52 (12.1) |
| Semiskilled/unskilled | 45 (4.1) | 33 (3.8) | 28 (4.0) | 19 (3.5) | 13 (3.0) |
| Age 11 cognitive ability, mean (SD) | 0.0 (11.6) | 0.5 (11.8) | 1.2 (11.8) | 1.4 (11.8) | 1.8 (11.6) |
| Years of education, mean (SD) | 10.7 (1.1) | 10.8 (1.1) | 10.8 (1.1) | 10.9 (1.2) | 10.9 (1.2) |
FI, frailty index; SD, standard deviation.