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Table 1 Baseline characteristics of participants in the intervention and control group

From: The effects of WeChat-based educational intervention in patients with ankylosing spondylitis: a randomized controlled trial

Variable All (N = 118) N (%) Intervention group (N = 59)
N (%)
Control group (N = 59)
N (%)
t/χ2/Z P
Age (yr, mean ± SD) 29.93 ± 8.23 30.80 ± 8.82 29.07 ± 7.58 1.142 0.256a
Gender     0.457 0.499b
 Male 93 (78.8) 45 (76.3) 48 (81.4)   
 Female 25 (21.2) 14 (23.7) 11 (18.6)   
Educational level     0.218 0.897b
 Junior high school or below 30 (25.4) 15 (25.4) 15 (25.4)   
 Senior high school 26 (22.0) 12 (20.3) 14 (23.7)   
 College or above 62 (52.5) 32 (54.2) 30 (50.8)   
Marital status     0 1.000b
 Single/divorced 62 (52.5) 31 (52.5) 31 (52.5)   
 Married 56 (47.5) 28 (47.5) 28 (47.5)   
Monthly per capita income (¥, yuan)     1.720 0.633b
 < 2200 34 (28.8) 16 (27.1) 18 (30.5)   
 2200~3299 33 (28.0) 15 (25.4) 18 (30.5)   
 3300~5499 23 (19.5) 11 (18.6) 12 (20.3)   
 ≥ 5500 28 (23.7) 17 (28.8) 11 (18.6)   
Medical insurance     0.160 0.689b
 Self-pay 82 (69.5) 40 (67.8) 42 (71.2)   
 Medical insurance 36 (30.5) 19 (32.2) 17 (28.8)   
Smoking status     1.502 0.472b
 Current smoking 36 (30.5) 19 (32.2) 17 (28.8)   
 Never smoking 70 (59.3) 36 (61.0) 34 (57.6)   
 Quit smoking 12 (10.2) 4 (6.8) 8 (13.6)   
Medication     2.185 0.139b
 DMARDs 64 (54.2) 28 (47.5) 36 (61.0)   
 DMARDs+biologics 54 (45.8) 31 (52.5) 23 (39.0)   
Symptom duration (yr), M [IQR] 5.00 [6.00] 6.00 [7.00] 5.00 [7.00] − 0.346 0.730c
Duration since diagnosis (yr), M [IQR] 3.00 [6.00] 3.00 [6.00] 3.00 [6.00] − 0.577 0.564c
SF-36 subgroups
 Physical functioning 77.88 ± 18.67 77.54 ± 20.46 78.22 ± 16.86 − 0.196 0.845a
 Role physical, M [IQR] 50.00 [100.00] 50.00 [100.00] 50.00 [100.00] − 0.490 0.624c
 Bodily pain 51.49 ± 20.31 53.97 ± 22.39 49.02 ± 17.84 1.328 0.187a
 General health 49.08 ± 21.29 49.81 ± 21.93 48.34 ± 20.79 0.375 0.708a
 Vitality 65.89 ± 18.95 67.63 ± 19.06 64.15 ± 18.85 0.996 0.321a
 Social functioning 70.46 ± 22.68 69.33 ± 23.45 71.59 ± 22.03 − 0.539 0.591a
 Role emotional 64.41 ± 43.52 66.67 ± 43.33 62.15 ± 43.97 0.562 0.575a
 Mental health 67.29 ± 15.39 67.12 ± 15.97 67.46 ± 14.92 − 0.119 0.905a
BDI-II, M [IQR] 5.00 [11.25] 5.00 [10.00] 6.00 [12.00] − 0.543 0.587c
BAS-G 3.36 ± 2.31 3.31 ± 2.37 3.41 ± 2.27 − 0.234 0.815a
BASFI, M [IQR] 0.60 [1.70] 0.60 [1.90] 0.60 [1.50] − 0.586 0.558c
Overall pain 3.24 ± 2.35 2.97 ± 2.33 3.51 ± 2.36 − 1.267 0.208a
Back pain 2.96 ± 2.33 2.76 ± 2.30 3.16 ± 2.36 − 0.929 0.355a
Nocturnal pain 3.02 ± 2.48 3.00 ± 2.33 3.05 ± 2.64 − 0.103 0.918a
Morning stiffness 2.45 ± 2.11 2.35 ± 1.93 2.56 ± 2.29 − 0.545 0.587a
  1. SD standard deviation, yr year, DMARDs disease-modifying anti-rheumatic drugs, M median, IQR interquartile range, BDI-II Beck Depression Inventory-II, BAS-G Bath Ankylosing Spondylitis Patient Global Score, BASFI Bath Ankylosing Spondylitis Functional Index
  2. aIndependent samples t test
  3. bChi-square test
  4. cMann-Whitney U test
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