BASFI (model 1) | BASFI (model 2) | BASFI (model 3) | BASFI (model 4) | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|

B (95% CI) | β | p Value | B (95% CI) | β | p Value | B (95% CI) | β | p Value | B (95% CI) | β | p Value | |

ASDAS | 0.812 (0.573 to 1.051) | 0.363 | <0.001 | 0.884 (0.621 to 1.147) | 0.395 | <0.001 | ||||||

BASDAI | 0.545 (0.418 to 0.671) | 0.436 | <0.001 | 0.570 (0.427 to 0.712) | 0.456 | <0.001 | ||||||

BASMI | 0.489 (0.352 to 0.626) | 0.399 | <0.001 | 0.542 (0.413 to 0.671) | 0.443 | <0.001 | ||||||

mSASSS | 0.270 (0.002 to 0.538) | 0.139 | 0.048 | 0.464 (0.206 to 0.723) | 0.239 | <0.001 | ||||||

Disease duration | −0.472 (−0.700 to −0.243) | −0.243 | <0.001 | −0.360 (−0.578 to −0.141) | −0.185 | 0.001 | −0.354 (−0.604 to −0.104) | −0.183 | 0.006 | −0.244 (−0.487 to −0.002) | −0.126 | 0.048 |

Age | 0.031 (0.007 to 0.054) | 0.160 | 0.011 | 0.026 (0.004 to 0.048) | 0.134 | 0.023 | 0.032 (0.005 to 0.060) | 0.168 | 0.022 | 0.021 (−0.006 to 0.047) | 0.109 | 0.121 |

BMI | 0.093 (0.040 to 0.144) | 0.197 | 0.001 | 0.080 (0.030 to 0.129) | 0.170 | 0.002 | 0.097 (0.040 to 0.154) | 0.206 | 0.001 | 0.082 (0.027 to 0.137) | 0.174 | 0.004 |

Gender (male) | −0.535 (−1.031 to −0.144) | −0.116 | 0.034 | −0.283 (−0.756 to 0.189) | −0.062 | 0.239 | −0.537 (−1.111 to 0.037) | −0.117 | 0.067 | −0.385 (−0.940 to 0.171) | −0.083 | 0.174 |

R^{2}=0.40 | R^{2}=0.47 | R^{2}=0.28 | R^{2}=0.33 | |||||||||

adjR^{2}=0.39 | adjR^{2}=0.45 | adjR^{2}=0.26 | adjR^{2}=0.31 |

p Values <0.05 are highlighted in bold.

adjR

^{2}, adjusted R^{2}, a better estimate of the population value of R^{2}; ASDAS, Ankylosing Spondylitis Disease Activity Score; B, regression coefficient; β, standardised coefficient; BASDAI, Bath Ankylosing Spondylitis Disease Activity Index; BASFI, Bath Ankylosing Spondylitis Functional Index; BASMI, linear definition of the Bath Ankylosing Spondylitis Metrology Index; BMI, Body Mass Index; mSASSS, modified Stoke Ankylosing Spondylitis Spine Score; R^{2}, an estimate of the proportion of variance in the dependent variable accounted for by the regression.