Table 1.
Baseline characteristics of included patients (n=1620)
| Age, years, mean (SD) | 55 (14.7) | |
| Gender, male, n (%) | 655 (40.4) | |
| Duration of ETA, n (%) | 1 year | 78 (4.8) |
| 2 years | 106 (6.5) | |
| 3 years | 176 (10.9) | |
| 4 years | 207 (12.8) | |
| 5 years | 205 (12.7) | |
| >5 years | 848 (52.3) | |
| Comorbidities*, n (%) | 1 Certain infectious and parasitic diseases | 42 (2.6) |
| 2 Neoplasms | 78 (4.8) | |
| 3 Diseases of blood and blood forming organs | 26 (1.6) | |
| 4 Endocrine, nutritional, metabolic diseases | 134 (8.3) | |
| 5 Mental and behavioural disorders | 17 (1.0) | |
| 6 Diseases of the nervous system | 67 (4.1) | |
| 7 Diseases of eye and adnexa | 72 (4.4) | |
| 8 Diseases of ear and mastoid | 35 (2.2) | |
| 9 Diseases of circulatory system | 175 (10.8) | |
| 10 Diseases of respiratory system | 109 (6.7) | |
| 11 Diseases of digestive system | 157 (9.7) | |
| 12 Diseases of skin and subcutaneous system | 143 (8.8) | |
| 13 Diseases of musculoskeletal system and connective tissue | 1598 (98.6) | |
| 14 Diseases of genitourinary system | 113 (7.0) | |
| 15 Pregnancy, childbirth and puerperium | 15 (0.9) | |
| 16 Conditions in perinatal period | – | |
| 17 Congenital malformations, deformations, chromosomal abnormalities | 16 (1.0) | |
| 18 Symptoms, signs and abnormal clinical etc | 199 (12.3) | |
| 19 Injury, poisoning, consequences of external causes | 185 (11.4) | |
| 20 External causes of morbidity and mortality | – | |
| 21 Factors influencing health status and contact with health services | 863 (53.3) |
*WHO diagnosis chapters 12–24 months previously.
ETA, originator etanercept.