Table 2.

Univariate logistic regression analysis of patients’ characteristics and symptoms at various followup intervals.

Variable	2 Yrs	5 Yrs	7 Yrs	10 Yrs
Sex	0.312	0.638	0.597	0.952
Ethnicity	0.043	0.024	0.047	0.013
Family history	0.331	0.638	0.366	0.939
HLA-B27	0.232	0.01	0.012	0.028
Buttock pain	0.027	0.005	0.003	0.06
ILBP	< 0.001	< 0.001	< 0.001	< 0.001
Hip	0.319	0.087	0.077	0.119
Shoulder	0.331	0.3	0.511	0.512
Sternoclavicular	0.198	0.101	0.065	0.296
Knees	0.125	0.103	0.233	0.06
Ankles	0.016	0.028	0.03	0.003
Elbows	0.274	0.322	0.332	—
Wrists	0.365	0.225	0.166	0.296
Enthesopathy	0.549	0.708	0.351	0.198
Achilles	0.198	0.896	0.464	0.407
Plantar	0.319	0.708	0.992	0.482
Sausage finger	0.331	0.975	0.332	0.296
Glucocorticoids	0.984	0.756	0.533	0.783
Methotrexate	0.54	0.712	0.499	0.428
Sulfasalazine	0.013	< 0.001	< 0.001	0.004
Biologics	—	—	—	0.324
Sacroiliitis grade I	< 0.001	< 0.001	< 0.001	< 0.001