Table 1.

Variables incorporated into SLESIS

Variable	β coefficient	HR for severe infection	95% CI
Age at diagnosis (>46 years)	0.1163	1.12	1.07 to 1.18
Latin American ethnicity	0.427	2.40	2.29 to 2.5
Current dose of corticosteroids ≥10 mg/day	0.2878	1.33	1.15 to 1.55
Sex (male)	0.3692	1.49	1.22 to 1.81
Previous hospitalisation for SLE	1.0049	2.73	2.22 to 3.35
Katz Index21	0.062	1.06	1.03 to 1.1
Each previous severe infection	0.8739	2.40	2.29 to 2.50

These HR values were derived from the retrospective analysis of 3658 Spanish patients described in ref [17].

SLE, systemic lupus erythematosus; SLESIS, Systemic Lupus Erythematosus Severe Infection Score.