Retrospective UK study of CPRD dataset (2012-2023) found 22 829 incident CTD Dx (81% F). Over time incidence SLE & Systemic Sclerosis fell, Sjogrens & MCTD stable, & IIM rose 3.23–4.31/100K. IIM had highest mortality (28/1000 py), followed by SSc, SLE, MCTD; lowest SjD (9.7)