Design: Single-centre cohort with time-dependent Cox models
Population: 335 patients with SLE, 3,582 visits, Sweden, 2008–2025
Primary outcome: Damage accrual (SLICC/ACR damage index)
Effect: Adjusted mean SLE-DAS HR 1.04–1.05 at 3, 5 and 7 years; SLEDAI-2K predictive at 5 years only

A Swedish university clinic analysed 335 patients with lupus and 3,582 visits between 2008 and 2025. SLEDAI-2K and physician global assessment were recorded prospectively; SLE-DAS, a newer continuous activity score, was calculated retrospectively. Damage was measured with the SLICC/ACR damage index.

Average SLE-DAS independently predicted damage accrual at three, five and seven years (HR about 1.04–1.05 per unit), while SLEDAI-2K did so only at five years. Model-fit statistics favoured SLE-DAS at every time point. Physician global assessment was also predictive at five and seven years.

SLE-DAS uses much the same clinical data as SLEDAI-2K but weights items continuously, so it can be adopted without extra tests. This is one centre, and SLE-DAS was scored after the fact.

Consider recording SLE-DAS alongside SLEDAI-2K in lupus clinics.
Keep a physician global assessment, which also predicted damage.
Use sustained low activity over time, not single visits, to judge damage risk.
Score damage annually with the SLICC/ACR index.

Why it matters

Better activity scoring helps target treatment at patients heading for irreversible damage.

The statistics, in plain English

A hazard ratio of 1.04 per unit sounds small, but SLE-DAS spans many units, so sustained differences add up. Lower AIC and BIC values mean the SLE-DAS model fitted the data better.