Table 2.

Secondary IMID conditional incidence rates per 1000 person-years for case and control patients

Initial IMID		Secondary IMIDa
	N	AS	CE	HS	LU	PsA	PsO	RA	UV	IBD	Any 1	Any 2
Case patients
AS	6352	–	2.1	0.4	7.2	11.3	9.0	64.4	17.4	8.4	105.2	14.6
CE	19,217	0.4	–	0.7	3.6	0.7	5.5	7.4	1.9	10.0	28.2	2.2
HS	14,136	0.4	0.9	–	1.7	0.5	6.3	4.9	1.6	3.0	17.6	1.4
LU	29,690	1.6	2.7	1.3	–	2.0	5.3	59.6	3.7	4.0	71.9	5.2
PsA	8406	6.7	1.0	1.2	5.3	–	173.1	109.4	3.8	3.7	234.1	32.6
PsO	115,141	0.5	1.1	1.1	1.6	22.1	–	8.8	1.6	2.2	33.4	5.3
RA	103,036	5.0	2.3	1.0	18.4	8.9	7.4	–	3.2	4.0	46.3	5.2
UV	34,422	7.8	1.0	0.9	3.2	1.3	4.5	13.9	–	4.7	32.7	4.5
IBD	68,535	1.2	2.9	1.2	1.9	0.6	5.1	8.5	3.5	–	23.1	2.1
Control patients
AS	4,059,296	0.0	0.2	0.1	0.3	0.2	1.0	1.1	0.3	0.5	3.3	0.4
CE	11,520,448	0.1	0.0	0.1	0.4	0.2	1.0	1.3	0.4	0.5	3.6	0.5
HS	8,447,796	0.1	0.2	0.0	0.4	0.2	0.9	1.1	0.3	0.5	3.2	0.5
LU	19,812,412	0.1	0.2	0.2	0.2	0.3	1.1	1.5	0.4	0.5	3.7	0.5
PsA	5,380,715	0.1	0.2	0.1	0.4	0.2	1.0	1.3	0.4	0.5	3.6	0.5
PsO	74,228,131	0.1	0.2	0.1	0.4	0.1	0.1	1.2	0.4	0.5	2.6	0.4
RA	68,808,782	0.1	0.2	0.1	0.3	0.2	1.0	0.3	0.4	0.5	2.7	0.4
UV	22,166,447	0.1	0.2	0.1	0.4	0.2	1.1	1.3	0.1	0.5	3.4	0.5
IBD	42,371,769	0.1	0.2	0.1	0.4	0.2	1.0	1.2	0.3	0.1	3.1	0.5

Conditional incidence rates reflect the likelihood of developing a secondary IMID conditional on being in the sample for the initial IMID

^aSecondary IMIDs were identified by presence of  at least one claim with an ICD-9 diagnosis code for that secondary IMID