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Table 1 Baseline characteristics of the ILD group and non-ILD group

From: Assessing the diagnostic value of a potential screening tool for detecting early interstitial lung disease at the onset of inflammatory rheumatic diseases

Variable ILD group, number (%) Non-ILD group, number (%) Difference
Number 63 (50.0%) 63 (50.0%)  
Gender
 Men 17 (27.0%) 17 (27.0%) χ2(1) = 0.000,P = 1.000
 Women 46 (63.0%) 46 (63.0%)
Age
 Median ± SD 58.6 ± 14.2 years 53.8 ± 14.3 years t(124) = − 1.907,P = 0.059
Inflammatory rheumatic diseases
 Connective tissue disease 35 (55.6%) 55 (87.3%) χ2(3) = 17.732,P < 0.001, Cramer’s V = 0.375
 Small vessel vasculitis 16 (25.4%) 3 (4.8%)
 Myositis 12 (19.0%) 5 (7.9%)
Symptoms
 Dyspnea 36 (57.1%) 22 (34.9%) χ2(1) = 6.262,P = 0.012
 Cough 17 (27.0%) 11 (17.5%) χ2(1) = 1.653,P = 0.199
 Sputum 11 (17.5%) 8 (12.7%) χ2(1) = 0.558,P = 0.455
 Sclerosiphonia 20 (31.7%) 5 (7.9%) χ2(1) = 11.228,P = 0.001
 No symptoms 20 (31.7%) 30 (47.6%) χ2(1) = 3.316,P = 0.069
Pulmonary comorbidities
 Emphysema 2 (3.2%) 3 (4.8%) χ2(1) = 0.19,P = 0.661
 COPD 3 (4.8%) 1 (1.6%) χ2(1) = 1.03,P = 0.310
 Smoking
  Active 10 (15.9%) 11 (17.5%) χ2(3) = 4.92,P = 0.085
  Ex-smoker 18 (28.6%) 8 (12.7%)
  Pack years 21.7 ± 12.3 22.7 ± 13.9 t(38) = − 0.24,P = 0.808