Table 1 Incidence rates and incidence rate ratios of CFS/ME in the Norwegian population according to year, sex and age in 2008 (categorized), 2008 to 2012
Variable | Number of cases | Number of person years | Incidence rate per 100,000 person years (95% CI) | Incidence rate ratio (95% CI) |
|---|---|---|---|---|
Year | ||||
2008 | 1,172 | 4,494,062 | 26.1 (24.6 to 27.6) | 1.0 (ref.) |
2009 | 1,113 | 4,491,822 | 24.8 (23.3 to 26.3) | 0.9 (0.9 to 1.0) |
2010 | 1,104 | 4,449,683 | 24.8 (23.4 to 26.3) | 0.9 (0.9 to 1.0) |
2011 | 1,222 | 4,395,325 | 27.8 (26.3 to 29.4) | 1.0 (1.0 to 1.1) |
2012 | 1,198 | 4,342,818 | 27.6 (26.1 to 29.2) | 0.9 (0.9 to 1.1) |
Sex | ||||
Male | 1,430 | 11,050,966 | 12.9 (12.3 to 13.6) | 1.0 (ref.) |
Female | 4,379 | 11,122,744 | 39.4 (38.2 to 40.6) | 3.2 (3.0 to 3.4) |
Age category (years) | ||||
5 to 9 | 121 | 1,497,289 | 8.1 (6.7 to 9.7) | 1.3 (1.1 to 1.6) |
10 to 14 | 690 | 1,578,106 | 43.7 (40.5 to 47.1) | 7.1 (6.3 to 8.1) |
15 to 19 | 689 | 1,598,802 | 43.1 (39.9 to 46.4) | 7.0 (6.2 to 8.0) |
20 to 24 | 473 | 1,481,322 | 31.9 (29.1 to 34.9) | 5.2 (4.5 to 5.9) |
25 to 29 | 492 | 1,523,923 | 32.3 (29.5 to 35.3) | 5.2 (4.6 to 6.0) |
30 to 34 | 688 | 1,603,520 | 42.9 (39.6 to 46.2) | 7.0 (6.1 to 7.9) |
35 to 39 | 771 | 1,809,970 | 42.6 (39.6 to 45.7) | 6.9 (6.1 to 7.8) |
40 to 44 | 614 | 1,797,270 | 34.2 (31.5 to 37.0) | 5.6 (4.9 to 6.3) |
45 to 49 | 496 | 1,636,483 | 30.3 (27.7 to 33.1) | 4.9 (4.3 to 5.6) |
50 to 54 | 383 | 1,564,478 | 24.5 (22.1 to 27.1) | 4.0 (3.4 to 4.6) |
55+ | 392 | 6,082,547 | 6.2 (5.6 to 6.9) | 1.0 (ref.) |