Table 3.

Sensitivity analysis of incidence ratios for SLE flares resulting in hospitalization after influenza infection.

Variable	Incidence ratio (95% CI)
Wash out period prior to hospitalization
8 weeks	30.08 (19.98–45.29)
12 weeks	28.76 (18.79–44.01)
Control interval
Preexposure 26 weeks	24.81 (20.45–30.10)
Postexposure 25 weeks	26.02 (22.07–30.69)
SLE flares
Use of glucocorticoid ≥ 30 mg/day	23.54 (9.43–58.77)
Use of glucocorticoid ≥ 50 mg/day	24.95 (13.67–45.55)
Influenza infection defined with
Diagnosis code or medication code	22.73 (16.37–31.57)

SLE systemic lupus erythematosus, CI confidence interval.