Table 1

Differences in baseline characteristics between patients with psoriasis and controls before and after propensity score matching (PSM)

Before PSMAfter PSM
Control group, n=82 430*Psoriasis group, n=29 949*P value†SMDControl group, n=21 138*Psoriasis group, n=21 138*P value†SMD
Sex<0.0010.067<0.0010.046
 Female37 616 (45.6)12 677 (42.3)9938 (47.0)9449 (44.7)
 Male44 814 (54.4)17 272 (57.7)11 200 (53.0)11 689 (55.3)
Age (mean (SD))46.86 (16.81)43.54 (16.55)<0.0010.19945.37 (16.40)45.37 (16.40)1<0.001
Type of payouts<0.0010.2550.0290.026
 Medical insurance payouts68 095 (82.6)27 295 (91.1)18 601 (88.0)18 504 (87.5)
 Off-site medical insurance payouts987 (1.2)159 (0.5)116 (0.5)157 (0.7)
 Self-paying13 348 (16.2)2495 (8.3)2421 (11.5)2477 (11.7)
Hospital grade<0.0010.2090.0930.016
 Tertiary hospital (%)65 452 (79.4)26 104 (87.2)17 436 (82.5)17 303 (81.9)
 Non-tertiary hospital (%)16 978 (20.6)3845 (12.8)3702 (17.5)3835 (18.1)
  • *n (%).

  • †Wilcoxon rank-sum test. The χ2 test of independence.

  • SMD, standardised mean difference.