Time from RA diagnosis until ultrasonography | Correlation coefficient (95% confidence interval) | Pvalue |
---|---|---|
Quartile 1, one to seven years | -0.003 (-0.019 to 0.013) | 0.82 |
Quartiles 2 and 3, 7.5 to 19.7 years | -0.012 (-0.021 to -0.003) | 0.02 |
Quartile 4, 20 to 38 years | 0.008 (-0.003 to 0.019) | 0.27 |