Table 1B. Baseline characteristics of cohorts, Stockholm County, influenza seasons 2013/14 and 2014/15.
| Characteristic | Influenza season 2013/14 | Influenza season 2014/15 | ||||
|---|---|---|---|---|---|---|
| Total | Vaccinateda | Unvaccinated | Total | Vaccinateda | Unvaccinated | |
| n | n (%) | n (%) | n (%) | n (%) | n (%) | |
| Cohort total | 2,171,207 | 199,707 (9.2) | 1,971,500 (90.8) | 2,207,172 | 205,709 (9.3) | 2,001,463 (90.7) |
| Sex | ||||||
| Male | 1,077,657 | 84,692 (7.9) | 992,965 (92.1) | 1,096,957 (49.7) | 88,091 (8.0) | 1,008,866 (92.0) |
| Female | 1,093,550 | 115,015 (10.5) | 978,535 (89.5) | 1,110,215 (50.3) | 117,618 (10.6) | 992,597 (89.4) |
| Age group in years | ||||||
| < 10 | 283,541 | 488 (0.2) | 283,053 (99.8) | 287,422 (13.0) | 495 (0.2) | 286,927 (99.8) |
| 10–19 | 234,837 | 521 (0.2) | 234,316 (99.8) | 236,884 (10.7) | 606 (0.3) | 236,278 (99.7) |
| 20–29 | 305,611 | 1,892 (0.6) | 303,719 (99.4) | 311,773 (14.1) | 2,257 (0.7) | 309,516 (99.3) |
| 30–39 | 327,012 | 4,715 (1.4) | 322,297 (98.6) | 330,199 (15.0) | 5,343 (1.6) | 324,856 (98.4) |
| 40–49 | 319,407 | 4,371 (1.4) | 315,036 (98.6) | 323,168 (14.6) | 5,116 (1.6) | 318,052 (98.4) |
| 50–59 | 254,154 | 7,906 (3.1) | 246,248 (96.9) | 263,216 (11.9) | 9,094 (3.5) | 254,122 (96.5) |
| 60–69 | 224,687 | 54,003 (24.0) | 170,684 (76.0) | 222,631 (10.1) | 52,957 (23.8) | 169,674 (76.2) |
| 70–79 | 136,323 | 76,112 (55.8) | 60,211 (44.2) | 146,285 (6.6) | 79,824 (54.6) | 66,461 (45.4) |
| ≥ 80 | 85,635 | 49,699 (58.0) | 35,936 (42.0) | 85,594 (3.9) | 50,017 (58.4) | 35,577 (41.6) |
| Mosaic income/education | ||||||
| Highest income and education | 990,078 | 93,330 (9.4) | 869,748 (90.6) | 1,001,695 | 97,153 (9.7) | 904,542 (90.3) |
| Middle income and education | 381,870 | 36,128(9.5) | 345,742 (90.5) | 389,999 | 37,076 (9.5) | 352,923 (90.5) |
| Lowest income and education | 776,802 | 69,729 (9.0) | 707,073 (91.0) | 786,842 | 70,113 (8.8) | 716,729 (91.2) |
| Missing | 22,457 | 890 (4.0) | 21,567 (96.0) | 28,636 | 1,367 (4.8) | 27,269 (95.2) |
| Comorbidity | ||||||
| Yes | 635,947 | 147,899 (23.3) | 488,048 (76.7) | 653,248 (29.6) | 15,187 (23.2) | 501,421 (76.8) |
| No | 1,535,260 | 51,808 (3.4) | 1,483,452 (96.6) | 1,553,924 (70.4) | 53,882 (3.5) | 1,500,042 (96.5) |
| Previous seasonal vaccinationb | ||||||
| Yes | 179,658 | 149,881 (83.4) | 29,777 (16.6) | 193,432 (8.8) | 153,515 (79.4) | 39,917 (20.6) |
| No | 1,991,549 | 49,826 (2.5) | 1,941,723 (97.5) | 2,013,740 (91.2) | 52,194 (2.6) | 1,961,546 (97.4) |
| Pneumococcal vaccinationc | ||||||
| Yes | 48,009 | 38,801 (80.8) | 9,208 (19.2) | 55,929 (2.5) | 43,833 (78.4) | 12,096 (21.6) |
| No | 2,123,198 | 160,906 (7.6) | 1,962,292 (92.4) | 2,151,243 (97.5) | 161,876 (7.5) | 1,989,367 (92.5) |
| Pandemrix vaccinationd | ||||||
| Yes | 995,193 | 156,389 (15.7) | 838,804 (84.3) | 981,065 (44.5) | 157,771 (16.1) | 823,294 (83.9) |
| No | 1,176,014 | 43,382 (3.7) | 1,132,632 (96.3) | 1 226 107 (55.5) | 47,938 (3.9) | 1,178,169 (96.1) |
Influenza season defined as 1 October to 31 May in the following year.
a During 2013/14 and 2014/15, 99.4% of seasonal influenza vaccination were carried out using Fluarix.
b Vaccinated against seasonal influenza during the previous season.
c Vaccinated against Streptococcus pneumoniae during time period from 2009 to the current season under investigation.
d Vaccinated against influenza A(H1N1) during the 2009 pandemic.