Table 1 Final sample characteristics by wave of follow-up
Variable | Wave | All waves | |||
|---|---|---|---|---|---|
Category | 4 | 5 | 6 | 7 | |
(2005–2006) | (2006–2007) | (2007–2008) | (2008–2009) | ||
Total | 1077 (100) | 960 (100) | 981 (100) | 914 (100) | 3932 (100) |
Campaign recall | |||||
Yes | 957 (88.9) | 788 (82.0) | 791 (80.6) | 733 (80.2) | 3269 (83.1) |
No | 120 (11.1) | 172 (17.9) | 190 (19.4) | 181 (19.8) | 663 (16.9) |
Age | |||||
18–24 | 46 (4.3) | 40 (4.2) | 48 (4.9) | 43 (4.7) | 177 (4.5) |
25–39 | 290 (26.9) | 262 (27.3) | 258 (26.3) | 220 (24.1) | 1030 (26.2) |
40–54 | 437 (40.6) | 385 (40.1) | 385 (39.2) | 369 (40.4) | 1576 (40.1) |
55 + | 304 (28.2) | 273 (28.4) | 290 (29.6) | 282 (30.9) | 1149 (29.2) |
Gender | |||||
Female | 601 (55.8) | 552 (57.5) | 553 (56.4) | 521 (57.0) | 2227 (56.6) |
Male | 476 (44.2) | 408 (42.5) | 428 (43.6) | 393 (43.0) | 1705 (43.4) |
Level of Education | |||||
Low | 376 (34.9) | 325 (33.9) | 287 (29.3) | 252 (27.6) | 1240 (31.5) |
Middle | 507 (47.1) | 454 (47.3) | 502 (51.2) | 479 (52.4) | 1942 (49.4) |
High | 194 (18.0) | 181 (18.9) | 192 (19.6) | 183 (20.0) | 750 (19.1) |
Region of residence | |||||
North East | 63 (5.8) | 49 (5.1) | 56 (5.7) | 49 (5.4) | 217 (5.5) |
Yorkshire | 118 (11.0) | 98 (10.2) | 92 (9.4) | 73 (8.0) | 381 (9.7) |
East Midlands | 101 (9.4) | 82 (8.5) | 90 (9.2) | 94 (10.3) | 367 (9.3) |
Eastern | 104 (9.7) | 102 (10.6) | 102 (10.4) | 96 (10.5) | 404 (10.3) |
London | 153 (14.2) | 147 (15.3) | 165 (16.8) | 142 (15.5) | 607 (15.4) |
South East | 189 (17.5) | 161 (16.8) | 158 (16.1) | 155 (17.0) | 663 (16.9) |
South West | 95 (8.8) | 102 (10.6) | 107 (10.9) | 99 (10.8) | 403 (10.2) |
West Midlands | 109 (10.1) | 95 (9.9) | 96 (9.8) | 103 (11.3) | 403 (12.2) |
North West | 145 (13.5) | 124 (12.9) | 115 (11.7) | 103 (11.3) | 487 (12.4) |
Wave of recruitment | |||||
Wave 1 (2002–03) | 653 (60.6) | 437 (45.5) | 316 (32.2) | 221 (24.2) | 1627 (41.4) |
Wave 2 (2003–04) | 86 (8.0) | 52 (5.4) | 38 (3.9) | 28 (3.1) | 204 (5.2) |
Wave 3 (2004–05) | 338 (31.4) | 210 (20.9) | 150 (15.3) | 108 (11.8) | 806 (20.5) |
Wave 4 (2005–06) | N/A | 261 (27.2) | 168 (17.1) | 108 (11.8) | 537 (13.7) |
Wave 5 (2006–07) | N/A | N/A | 309 (31.5) | 196 (21.4) | 505 (12.8) |
Wave 6 (2007–08) | N/A | N/A | N/A | 253 (27.7) | 253 (6.4) |