Table 2.

Correlation between BASDAI, BASFI, and other clinical parameters in USpA

	BASDAI		BASFI
	R	P	r	P
Age at onset (years)	0.204	0.001	−0.073	0.249
Duration (years)	0.116	0.670	0.020	0.752
Modified Schober’s test (cm)	−0.109	0.860	−0.314	0.000
Chest expansion (cm)	0.023	0.716	0.024	0.702
ESR (mm/h)	0.142	0.025	0.357	0.000
CRP (mg/L)	0.211	0.001	0.336	0.000

r Spearman’s correlation coefficient