Table I.
Descriptive statistics
| Hidradenitisa n = 1,012 (1.90%) | Healthy n = 52,161 (98.1%) | cp-value | |
|---|---|---|---|
| Days from DBDS inclusion to July 1, | 558 (283) | 572 (282) | 0.48 |
| 2018, mean (SD) | |||
| Sex, n (%) | |||
| Female | 618 (61.1) | 25,240 (48.4) | 1.7×10 –15 |
| Male | 394 (38,9) | 26,921 (51.6) | |
| Smoker, n (%) | |||
| Yes | 267 (26.4) | 6,768 (13.0) | |
| No | 741 (73.2) | 45,263 (86,8) | < 2.2×10 –16 |
| NA | 4 (0.4) | 130 (0.2) | |
| Body mass index, kg/m2, mean (SD) | 27.7 (5.5) | 25.7 (4.2) | < 2.2×10 –16 |
| NA, n (%) | 3 (0.3) | 153 (0.3) | |
| Age at enrolment, years, mean (SD) | 37.0 (11.8) | 40.4 (13.1) | 5.1×10 –16 |
| Diagnosed with HS according to the | < 2.2×10 –16 | ||
| DNPR, n (%) | 153 (15.1) | 130 (0.25) | |
| Demographics on prescriptions | |||
| Number who received prescription, n (%) | 761 (75.2) | 35,959 (68.9) | 2.3×10 –5 |
| Prescriptions (mean per person (SD))b | 6,848 (6.77) | 278,034 (5.33) | 1.32×10 –4 |
| Time to first prescription, mean (SD) | 203.5 (232.4) | 256.3 (257.9) | 6.8×10 –14 |
a
Based on whether they fulfil the questionnaire definition for HS.
b
Number of prescriptions from the time of inclusion to 1 July 2018.
c
Pearson’s X2, Wilcoxon signed-rank test (age) or Welch’s 2-sample t-test (body mass index).
HS: hidradenitis suppurativa; SD: standard deviation; NA: not available; DBDS: Danish Blood Donor Study; DNPR: The Danish National Patient Registry. Bold numbers indicate all statistically significant tests.