Table 1: Demographic and baseline characteristics of patients.

Characteristic AS (N = 187) PsA (N = 385) P-value Total (N = 572)
Age (years), mean (SD) 46.6 (12.2) 53.0 (11.1) <0.001°° 50.9 (11.8)
Male, n (%) 120 (64.2) 161 (41.8) <0.001° 281 (49.1)
Weight (kg), mean (SD) 83.5 (15.9) 85.7 (19.0) 0.315°° 85.0 (18.0)
BMI (kg/m 2 ), mean (SD) 27.6 (5.0) 29.2 (6.1) 0.007°° 28.7 (5.8)
BMI ≥25 kg/m 2 , n (%) 122 (65.9) 278 (73.9) 0.059° 400 (71.3)
BMI ≥30 kg/m 2 , n (%) 55 (29.7) 148 (39.4) 0.031° 203 (36.2)
Non-smoker, n (%) 74 (39.8) 188 (48.8) NA 262 (45.9)
Ex-smoker, n (%) 31 (16.7) 66 (17.1) NA 97 (17.0)
Smoker, n (%) 63 (33.9) 102 (26.5) NA 165 (28.9)
Smoking time >10 years, n (%) 51 (85.0) 83 (91.2) NA 134 (88.7)
Duration between first symptoms and confirmed diagnosis*, n (%)
      <1 year 37 (22.4) 85 (24.5) 0.070° 122 (23.8)
    1 to <2 years 20 (12.1) 65 (18.7) NA 85 (16.6)
    2 to <5 years 30 (18.2) 71 (20.5) NA 101 (19.7)
    5 to <10 years 37 (22.4) 48 (13.8) NA 85 (16.6)
    ≥10 years 41 (24.8) 78 (22.5) NA 119 (23.2)

Assessment only, not the result itself
*Patient-reported (patient health record).
Missing values not included in % calculations
AS, Ankylosing Spondylitis; BMI, Body Mass Index; HLA, Human Leukocyte Antigen; N, number of patients; NA, Not Applicable/Not Available; PsA, Psoriatic Arthritis; SD, Standard Deviation.
°Fisher´s exact test, °° Wilcoxon test