Table 1.
Baseline characteristics
| November, 2006, to March, 2007 | November, 2007, to March, 2008 | November, 2008, to March, 2009 | May, 2009, to September, 2009 | October, 2009, to February, 2010 | November, 2010, to March, 2011 | ||
|---|---|---|---|---|---|---|---|
| GP practices/households/people | 42/243/602 | 43/310/779 | 37/309/729 | 41/332/797 | 127/1460/3552 | 51/361/901 | |
| Age group, years | |||||||
| 0–4 (6%) | 38 (6%) | 42 (5 %) | 37 (5%) | 36 (5%) | 179 (5 %) | 45 (5%) | |
| 5–15 (11%) | 87 (15%) | 110 (14%) | 99 (14%) | 109 (14%) | 501 (14%) | 131 (15%) | |
| 16–44 (42%) | 151 (25%) | 258 (33%) | 172 (24%) | 192 (24%) | 848 (24%) | 206 (23%) | |
| 45–64 (25%) | 203 (34%) | 272 (35%) | 267 (37%) | 293 (37%) | 1225 (35%) | 344 (38%) | |
| ≥65 (16%) | 123 (20%) | 97 (13%) | 154 (21%) | 167 (21%) | 799 (23%) | 175 (19%) | |
| Sex | |||||||
| Male (49%) | 281 (47%) | 366 (47%) | 340 (47%) | 377 (47%) | 1740 (49%) | 455 (51%) | |
| Female (51%) | 321 (53%) | 413 (53%) | 389 (53%) | 420 (53%) | 1812 (51%) | 446 (50%) | |
| Region | |||||||
| North (28%) | 99 (17%) | 89 (11%) | 100 (14%) | 106 (13%) | 320 (9%) | 115 (13%) | |
| West Midlands (11%) | 42 (7%) | 96 (12%) | 46 (6%) | 53 (7%) | 179 (5%) | 53 (6%) | |
| East and east Midlands (20%) | 122 (20%) | 120 (15%) | 124 (17%) | 118 (15%) | 1456 (41%) | 321 (36%) | |
| London (15%) | 28 (5%) | 77 (10%) | 26 (4%) | 28 (4%) | 270 (8%) | 65 (7%) | |
| Southeast (16%) | 100 (17%) | 117 (15%) | 107 (15%) | 155 (20%) | 319 (9%) | 110 (12%) | |
| Southwest (10%) | 211 (35%) | 280 (36%) | 326 (45%) | 337 (42%) | 1008 (28%) | 237 (26%) | |
| Vaccine | |||||||
| Vaccinated | 115 (19%) | 130 (17%) | 169 (23%) | 0 | 157 (4%) | 186 (21%) | |
| Unvaccinated | 462 (77%) | 632 (81%) | 527 (72%) | 797 (100%) | 3159 (89%) | 715 (79%) | |
| Unknown | 25 (4%) | 17 (2%) | 33 (5%) | 0 | 236 (7%) | 0 | |
| IMD quintile | |||||||
| 1 (20%) | 37 (6%) | 39 (5%) | 28 (4%) | 18 (2%) | 98 (3%) | 29 (3%) | |
| 2 (20%) | 88 (15%) | 126 (16%) | 91 (13%) | 62 (8%) | 310 (9%) | 82 (9%) | |
| 3 (20%) | 164 (27%) | 235 (30%) | 238 (33%) | 146 (18%) | 915 (26%) | 221 (25%) | |
| 4 (20%) | 162 (27%) | 250 (32%) | 187 (26%) | 146 (18%) | 938 (26%) | 280 (31%) | |
| 5 (20%) | 151 (25%) | 129 (17%) | 185 (25%) | 425 (53%) | 1291 (56%) | 289 (32%) | |
| Ethnic origin | |||||||
| White (75%) | 557 (98%) | 733 (95%) | 666 (99%) | 730 (99%) | 3306 (98%) | 846 (98%) | |
| Non-white (25%) | 5 (2%) | 35 (5%) | 6 (1%) | 7 (1%) | 78 (2%) | 19 (2%) | |
Percentages given alongside the categories are the national distributions. Data are n (%). IMD=Index of Multiple Deprivation.