Table 1.
Characteristics of cases and controls
| n | Cases | n | Controls | p | |
|---|---|---|---|---|---|
| All | |||||
| Sex (M/F), % | 670 | 16/84 | 670 | 16/84 | – |
| Age at sampling, years | 25 (21–29) | 25 (21–29) | 0.97 | ||
| Age at disease onset, years | 33 (28–40) | n.a. | – | ||
| Time from sampling until disease onset, years | 8 (4–13) | n.a. | – | ||
| Age group < 20 years | |||||
| Sex (M/F), % | 143 | 23/77 | 143 | 23/77 | – |
| Age at sampling, years | 18 (14–19) | 18 (14–19) | 0.82 | ||
| Age at disease onset, years | 26 (22–31) | n.a. | – | ||
| Time from sampling until disease onset, years | 10 (6–16) | n.a. | – | ||
| Age group 20–29 years | |||||
| Sex (M/F), % | 376 | 14/86 | 376 | 14/86 | – |
| Age at sampling, years | 25 (22–27) | 25 (23–27) | 0.89 | ||
| Age at disease onset, years | 33 (29–38) | n.a. | – | ||
| Time from sampling until disease onset, years | 8 (3–13) | n.a. | – | ||
| Age group 30–39 years | |||||
| Sex (M/F), % | 151 | 15/85 | 151 | 15/85 | – |
| Age at sampling, years | 33 (31–35) | 33 (31–35) | 0.72 | ||
| Age at disease onset, years | 40 (37–43) | n.a. | – | ||
| Time from sampling until disease onset, years | 6 (3–10) | n.a. | – | ||
| Biobank | |||||
| Umeå | 102 | 15.2 % | 102 | 15.2 % | – |
| PHAS | 139 | 20.8 % | 139 | 20.8 % | – |
| Örebro | 29 | 4.3 % | 29 | 4.3 % | – |
| Göteborg | 47 | 7.0 % | 47 | 7.0 % | – |
| Skåne | 314 | 46.9 % | 314 | 46.9 % | – |
| Linköping | 39 | 5.8 % | 39 | 5.8 % | – |
Values expressed as a percentage for proportions and median (interquartile range) for continuous variables. p values were calculated with the Mann–Whitney U test.
Abbreviation: PHAS, Public Health Agency of Sweden.