From: Studies on ageing and the severity of radiographic joint damage in rheumatoid arthritis
Step 1: effect of age on possible mediators | |||
Effect (β)a | 95 % CI | p value | |
SJC | 1.00 | 1.00–1.01 | 0.11 |
TJC | 1.00 | 1.00–1.01 | 0.55 |
Symptom duration | 0.992 | 0.988–0.996 | <0.001 |
CRP | 1.016 | 1.011–1021 | <0.001 |
RF | 0.99 | 0.98–1.00 | 0.09 |
ACPA | 0.98 | 0.97–0.99 | <0.001 |
Step 2: effect of age on radiographic joint damage | |||
Effect (β) | 95 % CI | p value | |
Ageing | 1.034 | 1.029–1.040 | <0.001 |
Step 3: effect of age and possible mediator on radiographic joint damage | |||
Effect (β) | 95 % CI | p value | |
SJC | 1.00 | 0.99–1.00 | 0.23 |
Ageing | 1.035 | 1.029–1.040 | <0.001 |
TJC | 1.00 | 0.98–1.01 | 0.76 |
Ageing | 1.037 | 1.030–1.044 | <0.001 |
Symptom duration | 1.003 | 1.002–1.005 | <0.001 |
Ageing | 1.035 | 1.029–1.040 | <0.001 |
CRP | 1.003 | 1.001–1.005 | 0.003 |
Ageing | 1.033 | 1.027–1.038 | <0.001 |
ACPA | 1.37 | 1.16–1.60 | <0.001 |
Ageing | 1.035 | 1.030–1.040 | <0.001 |
RF | 1.30 | 1.10–1.52 | 0.002 |
Ageing | 1.034 | 1.029–1.039 | <0.001 |