Figure 4.

Kaplan-Meier failure estimate plots for the probability of diagnosis following a first record of a musculoskeletal symptom (3a) and first mucocutaneous symptom (3b) in the 5 years before diagnosis to date of SLE diagnosis, stratified by age at SLE diagnosis (<30, 30–49 and ≥50 years) and baseline disease severity (mild-to-moderate or severe) taking left data truncation into account. Disease severity at baseline is defined as severe if the patient has at least one prescription for an immunosuppressant or a prescription for at least 30 days of treatment with oral prednisolone at a dose of 7.5 mg/day or more within 12 months of date of SLE diagnosis with all other patients classified as having mild/moderate disease at baseline.