Table 1.
Comparisons between respondents and nonrespondents in the total population invited to complete the self‐reported hidradenitis suppurativa questionnaire
| Total (n = 134 036) | Respondents (n = 57 445) | Nonrespondents (n = 76 591) | P‐valuec | |
|---|---|---|---|---|
| Sex, n (%)a | ||||
| Female | 78 451 (58.5) | 34 661 (60.3) | 43 790 (57.2) | < 0.001 |
| Male | 55 585 (41.5) | 22 784 (39.7) | 32 801 (42.8) | |
| Age (years), mean (SD) | 52.8 (12.5) | 55.8 (12.2) | 50.5 (12.3) | < 0.001 |
| Female | 52.3 (12.5) | 54.8 (12.1) | 50.3 (12.4) | < 0.001 |
| Male | 53.5 (12.6) | 57.3 (12.2) | 50.8 (12.2) | < 0.001 |
| Socioeconomic status,b mean (SD) | −0.62 (1.07) | −0.56 (1.06) | −0.66 (1.07) | < 0.001 |
| Smoking (last month), n (%)a, b | ||||
| No | 103 455 (78.9) | 47 164 (83.0) | 56 291 (75.7) | |
| Yes | 27 709 (21.1) | 9672 (17.0) | 18 037 (24.3) | < 0.001 |
| Missing | 2872 | 609 | 2263 | |
aThe first variable was used as the reference for analysis. bSelf‐reported. cAssociations with responder status.