Table 4

Estimated sensitivity of the 1997 ACR classification criteria for SLE and the 2019 EULAR/ACR classification criteria for SLE in the incident Southeast Norway SLE cohort during 2000–2017, at time of diagnosis, 2 years after diagnosis and at last visit in study period

	Classification criteria	Proportion of cases meeting criteria, % (95% CI) n₁/n₂,
	Classification criteria	At time of diagnosis	2 years after diagnosis*	At last visit in study period
Adult-onset SLE
Total	2019 EULAR/ACR	91.6 (89.5–93.6) 642/701	92.7 (90.6–94.7) 568/613	94.0 (92.3–95.8) 659/701
Total	1997 ACR	77.3 (74.2–80.4) 542/701	82.5 (79.5–85.5) 506/613	84.3 (81.6–87.0) 591/701
		P<0.001	P<0.001	P<0.001
Female	2019 EULAR/ACR	92.5 (90.4–94.7) 546/590	93.6 (91.4–95.7) 480/513	94.6 (92.7–96.4) 558/590
Female	1997 ACR	79.0 (75.7–82.3) 466/590	83.6 (80.4–86.8) 429/513	85.6 (82.8–88.4) 505/590
		P<0.001	P<0.001	P<0.001
Male	2019 EULAR/ACR	86.5 (80.1–92.8) 96/111	88.0 (81.6–94.4) 88/100	91.0 (85.7–96.3) 101/111
Male	1997 ACR	68.5 (59.8–77.1) 76/111	77.0 (68.6–85.2) 77/100	77.5 (69.7–85.2) 86/111
		P<0.001	P<0.05	P<0.05
Juvenile-onset SLE‡
Total	2019 EULAR/ACR	97.2 (91.9–102.6) 35/36	100 (100–100) 25/25	97.2 (91.9–102.6) 35/36
Total	1997 ACR	88.9 (78.6–99.2) 32/36	92.0 (81.4–102.6) 23/25	91.7 (82.6–100.7) 33/36
Female	2019 EULAR/ACR	96.6 (89.9–103.1) 28/29	100 (100–100) 21/21	96.6 (89.9–103.2) 28/29
Female	1997 ACR	89.7 (78.5–100.7) 26/29	90.5 (77.9–102.6) 19/21	89.7 (78.6–100.7) 26/29
Male	2019 EULAR/ACR	100† 7/7	100† 4/4	100† 7/7
Male	1997 ACR	85.7† 6/7	100† 4/4	100† 7/7

1997 ACR criteria, 1997 ACR classification criteria for SLE; 2019 EULAR/ACR criteria, 2019 EULAR/ACR classification criteria for SLE.
n₁, number of cases fulfilling the criteria; n_2,, total number of cases at visit
*Estimated sensitivity 2 years after diagnosis includes only the 638 incident cases during 2000–2015 to allow for 2-year follow-up for all cases.
†Less than 10 cases and to scarce for statistical analysis.
‡2019 EULAR/ACR criteria fulfilment vs 1997 ACR criteria fulfilment did not differ significantly.
EULAR/ACR, European Alliance of Associations for Rheumatology/American College of Rheumatology; SLE, systemic lupus erythematosus.