Table 2.

Crude and adjusted hazard ratios of depression in ankylosing spondylitis (AS) patients compared with the non-AS control group.

Patient group	N	Depression	Duration	Rate	HR (95% CI)
					Crude HRa	Adjusted HRb
Controls	57325	2894	195703.29	14.788	1 (ref.)	1 (ref.)
AS patients	11465	1243	37275.35	33.346	2.3 (2.152,2.458)	2.211 (2.068,2.363)

Crude HR^a; age, sex.

Adjusted HR^b; age, sex, income, residence, diabetes mellitus, Hypertension, Hyperlipidemia, stroke, cancer, end-stage renal disease.