Table 1.

Baseline characteristics of patients with PsA with delay in diagnosis of 2 or fewer years compared to more than 2 years.

≤ 2 yrs, n = 73> 2 yrs, n = 89Total, n = 162P
Time from PsA symptom onset to physician/rheumatologist diagnosis of PsA, yrs, median (IQR)0.5 (0.2–1.0)6.5 (3.5–10.1)2.5 (0.5–7.3)-
Age at PsA symptom onset, yrs, mean (SD)44.0 (12.4)39.5 (12.4)41.5 (12.6)0.04
Sex, female, n (%)36 (49)39 (44)75 (46)0.48
Education level, n (%)0.79
    ≤ High school16 (22)16 (18)32 (20)
    Some college or 2-yr degree27 (38)36 (40)63 (39)
    ≥ 4-yr college degree29 (40)37 (42)66 (41)
    Missing, n101
Race, n (%)0.02
    Black2 (3)2 (2)4 (2)
    Asian0 (0)8 (9)8 (5)
    Hispanic6 (8)3 (3)9 (6)
    Other/Mixed1 (1)0 (0)1 (1)
    White64 (88)75 (85)139 (86)
    Unknown011
BMI at PsA diagnosis, kg/m2, mean (SD)29.5 (6.1)32.2 (7.7)31.0 (7.1)0.03
    Missing, n459
Smoking at PsA diagnosis, n (%)0.53
    Current smoker12 (16)15 (17)27 (17)
    Past smoker23 (32)35 (39)58 (36)
    Never smoker38 (52)39 (44)77 (48)
Alcohol intake at PsA diagnosis, n (%)56 (77)65 (73)121 (75)0.59
PsO (current or personal history), n (%)0.15
    No PsO2 (3)5 (6)7 (4)
    Current PsO70 (96)78 (88)148 (91)
    Personal history of PsO1 (1)6 (7)7 (4)
Family history of PsO, n (%)24 (40)35 (49)59 (45)0.32
    Missing, n131730
Estimated age at onset of PsO symptoms, yrs, mean (SD)34 (14)34 (15)34 (14)0.85
    Missing257
PsO severity at first diagnosis, n (%)0.25
    Mild (< 2% BSA)38 (54)34 (41)72 (47)
    Moderate (2–10% BSA)20 (28)33 (40)53 (34)
    Severe (> 10% BSA)13 (18)16 (19)29 (19)
    No documentation/missing, n268
Type of PsO at first diagnosis, n (%)0.03
    Chronic plaque PsO56 (80)74 (88)130 (84)
    Guttate PsO3 (4)1 (1)4 (3)
    GPP1 (1)0 (0)1 (1)
    PPP2 (3)4 (5)6 (4)
    Sebopsoriasis5 (7)0 (0)5 (3)
    Chronic plaque PsO + guttate PsO0 (0)3 (4)3 (2)
    Chronic plaque + PPP1 (1)0 (0)1 (1)
    Chronic plaque + sebo PsO2 (3)2 (2)4 (3)
    No documentation/missing358
Site of psoriatic lesions at first PsO diagnosis, n (%)0.65
    Palms and/or soles1 (5)3 (15)4 (10)
    Elbows and/or knees3 (14)4 (20)7 (17)
    Limbs: arms and/or legs5 (23)5 (25)10 (24)
    Trunk0 (0)1 (5)1 (2)
    Face1 (5)0 (0)1 (2)
    Scalp9 (41)7 (35)16 (38)
    Intergluteal/perianal2 (9)0 (0)2 (5)
    Genital1 (5)0 (0)1 (2)
    Missing5169120
Nail involvement at first PsO diagnosis, n (%)24 (42)23 (35)47 (38)0.41
    No documentation, n162339
Family history of PsA, n (%)6 (12)6 (11)12 (11)0.84
    Missing, n223254
Enthesitis at or prior to PsA diagnosis, n (%)16 (22)35 (39)51 (31)0.02
Dactylitis at or prior to PsA diagnosis, n (%)35 (48)35 (39)70 (43)0.27
Inflammatory back pain at or prior to PsA diagnosis, n (%)4 (5)13 (15)17 (10)0.06
Uveitis, n (%)4 (5)3 (3)7 (4)0.70
Inflammatory bowel disease, n (%)0 (0)0 (0)0 (0)-
ESR (mm/h) at PsA diagnosis, mean (SD)18.9 (18.3)18.2 (15.3)18.5 (16.8)0.95
    Missing, n41721
CRP (mg/L) at PsA diagnosis, mean (SD)16.5 (32.4)13.6 (19.0)14.9 (26.0)0.87
    Missing, n222951
Radiographic damage, n (%)16 (22)28 (31)44 (27)0.19
    Missing, n101
  • BSA: body surface area; CRP: C-reactive protein; ESR: erythrocyte sedimentation rate; GPP: generalized pustular psoriasis; PPP: palmoplantar pustulosis psoriasis; PsA: psoriatic arthritis; PsO: psoriasis.