Table 1.

Doctor-diagnosed depression in ankylosing spondylitis (AS) patients (n = 1,738) compared with the general population seeking healthcare (n = 967,012)

	Observed			Expected
	Person time (years)	Number of cases 1	Depression rate 2	Number of cases	Depression rate 2	Absolute rate differences 2	Rate ratio 3	95% CI
Men, all	6,983	89	1,275	60	853	421	1.49	1.20, 1.89
≤50 years	2,879	42	1,376	27	933	443	1.47	1.10, 1.93
>50 years	4,104	47	1,155	31	759	396	1.52	1.07, 2.10
Women, all	3,259	83	2,547	46	1,409	1,138	1.81	1.44, 2.24
≤50 years	1,274	39	2,825	20	1,546	1,279	1.83	1.35, 2.42
>50 years	1,984	44	2,244	25	1,260	984	1.78	1.24, 2.48
Total, all	10,242	172	1,679	105	1,030	649	1.63	1.40, 1.89
≤50 years	4,153	83	1,825	47	1,123	702	1.63	1.32, 1.98
>50 years	6,089	89	1,512	56	923	588	1.64	1.28, 2.06

¹AS patients diagnosed with depression (ICD-10 code F32 or F33) in 1999 to 2011. ²Per 100,000 person-years. ³Bold figures indicate statistically significant results.