Table 2.

Percentage of times a variable was selected for each data set (A, B, C, D) and the average of those percentages across all data sets.

Variable	Data set (%)
	A	B	C	Average
Sex	0	20	0	7
Marital status	20	N/Aa	N/A	20
Year of diagnosis	20	40	20	27
Age at diagnosis	40	40	N/A	40
Year of disease onset	60	20	100	60
Age at disease onset	20	20	N/A	20
Year of start of the first biologic therapy	40	60	20	40
Age at start of the first biologic therapy	60	40	N/A	50
Years from diagnosis to start of the first biologic therapy	20	20	N/A	20
Disease years until start of the first biologic therapy	20	20	N/A	20
HLA-B27b	0	40	100	47
Employment status before disease	40	20	N/A	30
Employment status at baseline	20	20	0	13
Years of education	100	100	N/A	100
Smoking	40	40	20	33
Alcohol	20	40	20	27
Weight	40	N/A	N/A	40
Height	20	N/A	20	20
BMI	40	N/A	N/A	40
Number of pathologies	20	0	N/A	10
Biologic	20	20	20	20
Concomitant DMARDc	0	20	0	7
Concomitant corticoid	60	20	20	33
Baseline CRPd	20	0	20	13
Baseline ESRe	40	20	40	33
Baseline BASDAIf	40	0	60	33
Baseline BASFIg	80	100	40	73
Baseline ASDASh	60	40	60	53

^aN/A: not applicable.

^bHLA-B27: human leukocyte antigen B27.

^cDMARD: disease-modifying antirheumatic drug.

^dCRP: C-reactive protein.

^eESR: erythrocyte sedimentation rate.

^fBASDAI: Bath Ankylosing Spondylitis Disease Activity Index.

^gBASFI: Bath Ankylosing Spondylitis Functional Index.

^hASDAS: Ankylosing Spondylitis Disease Activity Score.