Table 2

Incidence rate ratio for myocardial infarction in SLE 1998–2016

Age at event	All ages		Age <40 years		Ages 40–59 years		Age ≥60 years
Age at event	SLE	Non-SLE	SLE	Non-SLE	SLE	Non-SLE	SLE	Non-SLE
Both sexes
n (mean prevalence)	115	196 259	18	77 294	40	65 211	57	53 754
Events	16	9051	1	66	3	1256	12	7729
Incidence ratio/1000 patient-years	7.3	2.4	2.9	0.9	3.9	1.0	11.1	7.6
Crude IRR	3.0		3.2		3.9		1.5
CI (95/99.9%) P value	1.3 to 6.9 <0.001		1.5 to 7.0 <0.001		1.3 to 12.1 <0.05		0.85 to 2.6 n.s.
Females
n	101	99 425	15	37 806	36	32 535	50	29 084
Events	14	3629	1	15	2	281	11	3333
IR/1000 patient-years	7.3	1.9	3.5	0.02	2.9	0.5	11.6	6.0
Crude IRR	3.8		175		5.8		1.9
CI (99/99.9%) P value	1.6 to 9.3 <0.001		74.8 to 409 <0.001		1.1 to 39.5 <0.01		0.3 to 12.3 n.s.
Males
n	14	96 834	3	39 488	4	32 676	7	24 670
Events	2	5422	0	51	1	975	1	4396
IR/1000 patient-years	7.5	2.9	–	–	12.1	1.6	7.52	9.4
Crude IRR	2.6		–		7.7		0.8
CI (99.9%) P value	0.7 to 10.3 n.s.		–		1.5 to 39.9 <0.001		0.1 to 5.7 n.s.