Table 2

Summary of performance of optimal models using ASDAS only, ASDAS/ BASFI and BASDAI/BASFI in and out of sample

In sample (n=4886)Validation dataset (n=1181)
ASDASASDAS/BASFIBASDAI/BASFIASDASASDAS BASFIBASDAI/BASFI
N parameters273333
AIC−1488−2265−2794
BIC−1313−2052−2578
E(EQ5D)0.7020.7010.6990.7250.7450.719
ME0.0000 .00030.001−0.033−0.053−0.027
MAE0.1430 .13150.1300.1360.1260.121
RMSE0.2000 .18550.1820.1990.1890.182
 Mean in sample=0.701Mean in sample=0.692

  • AIC, Akaike information criterion; ASDAS, Ankylosing Spondylitis Disease Activity Score; BASDAI, Bath Ankylosing Spondylitis Disease Activity Score; BASFI, Bath Ankylosing Spondylitis Functional Index; BIC, Bayesian information criterion; MAE, mean absolute error; ME, mean error; RMSE, root mean squared error.