Table 3

Baseline characteristics of users and non-users of SCQM apps (n=2111)

Mean (SD) or %
No app use (n=1799)App only
App use+discussion
P value*
Age (years)50.9 (13.1)46.6 (12.0)47.5 (13.4)<0.001
Male (%)4345440.809
Highest level of education completed (%)0.367
Diagnosis, n (%)0.011
 RA786 (44)55 (37)61 (38)
 PsA387 (22)31 (21)25 (15)
 axSpA626 (35)64 (43)76 (47)
Disease duration (years)8.7 (9.0)10.2 (8.69)9.5 (8.7)0.122
Number of comorbid conditions*1.4 (2.2)1.3 (2.2)1.0 (2.0)0.201
Biological DMARD users (%)6371720.012
Non-biological DMARD users (%)4639380.063
Low disease activity at baseline (%)5158640.004
Confident user of internet/smartphone in daily life (%)889597<0.001
Regular use of health tracking apps (%)3027370.131
  • *Test of difference between iDialog users and non-app users (t-test for means and χ test for proportions).

  • †Low disease activity was defined as DAS-28<3.2 in RA and BASDAI score≤4 in axSpA. In PsA, it was defined as fulfilling at least five of the seven following criteria for minimal disease activity: tender joint count≤1, swollen joint count≤1, Psoriasis Area and Severity Index score≤1 or body surface area≤3%, patient pain VAS score≤15, patient global disease activity VAS score≤20, HAQ Disability Index score≤0.5 and tender entheseal points≤1.

  • axSpA, axial spondyloarthritis; BASDAI, Bath Ankylosing Spondylitis Disease Activity Index; DAS-28, Disease Activity Score with 28 Joint Counts; DMARD, disease-modifying antirheumatic drug; HAQ, Health Assessment Questionnaire; PsA, psoriatic arthritis; RA, rheumatoid arthritis; SCQM, Swiss Clinical Quality Management in Rheumatic Diseases Registry; VAS, Visual Analogue Scale.