| Quintile | |||||
| 1 | 2 | 3 | 4 | 5 | |
| Initial IFX (n = 117) | 28 | 29 | 13 | 22 | 25 |
| Delayed IFX (n = 67) | 2 | 6 | 9 | 18 | 32 |
| Propensity score, median | 0.03 | 0.08 | 0.14 | 0.23 | 0.44 |
| Female sex (%) | 47 | 54 | 73 | 80 | 91 |
| Age at diagnosis, mean | 60.3 | 55.4 | 55.0 | 52.3 | 45.3 |
| RF positive (%) | 50 | 63 | 82 | 63 | 79 |
| Symptom duration (weeks), median | 28 | 27 | 24 | 22 | 24 |
| Tender joints (no.), mean | 10 | 11 | 14 | 15 | 17 |
| Swollen joints (no.), mean | 10 | 13 | 14 | 17 | 17 |
| ESR, median | 23 | 31 | 31 | 41 | 45 |
| DAS, mean | 3.69 | 4.11 | 4.36 | 4.76 | 4.88 |
| HAQ, median | 1.25 | 1.25 | 1.44 | 1.50 | 1.38 |
DAS, disease activity score; ESR, erythrocyte sedimentation rate; HAQ, health assessment questionnaire; IFX, infliximab; RF, rheumatoid factor.