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Linear regression analysis of carotid intima-media thickness, rheumatoid arthritis features and cardiovascular risk factors in recent-onset rheumatoid arthritis patients |
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| Variable |
R2 value |
Standardized β coefficient |
Standard error |
t value |
P value |
Confidence interval |
|
|
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| Univariate model |
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| Number of swollen joints |
0.12 |
0.391 |
0.041 |
2.25 |
0.032 |
0.008–0.174 |
| Disease activity score (DAS4v)a |
0.16 |
0.431 |
0.079 |
2.74 |
0.01 |
0.056–0.377 |
| C-reactive protein level (mg/l)a |
0.14 |
0.407 |
0.025 |
2.71 |
0.01 |
0.018–0.121 |
| Rheumatoid factor presenceb |
0.047 |
0.54 |
0.072–0.117 |
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| Age at onset of rheumatoid arthritisa |
0.56 |
0.759 |
0.001 |
7.19 |
<0.001 |
0.008–0.014 |
| Male sexb |
0.066 |
0.018 |
-0.298 to -0.030 |
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| Pack-year history |
0.10 |
0.320 |
0.001 |
2.09 |
0.044 |
0.000–0.005 |
| History of smoking, everb |
0.062 |
0.002 |
-0.329 to -0.079 |
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| Systolic blood pressurea |
0.27 |
0.540 |
0.184 |
3.63 |
<0.001 |
0.292–1.040 |
| Cholesterol level |
0.01 |
0.146 |
0.197 |
0.82 |
0.417 |
-0.564 to -0.239 |
| Multivariate model |
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| Age at onset of rheumatoid arthritis |
0.64 |
0.002 |
6.11 |
<0.001 |
0.007–0.012 |
|
| C-reactive protein level (mg/l) |
0.001 |
2.18 |
0.038 |
0.000–0.004 |
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Adjusted R2 of the multivariate linear regression model = 0.69. aVariables entered into the multivariate model. Parameters determined by univariate linear regression analysis or t testb. | ||||||
Hannawi et al. Arthritis Research & Therapy 2007 9:R116 doi:10.1186/ar2323 |
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