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Table 4 Study-based age- and gender-standardized prevalence estimates for subjective cognitive decline (SCD; last column) and cumulative frequency estimates for the stepwise application of SCD operationalization criteria according to quantitative harmonization/Item Response Theory (IRT) modeling

From: Estimating prevalence of subjective cognitive decline in and across international cohort studies of aging: a COSMIC study

Study SCD operationalization criteria
Criterion 1
Endorsement of a self-experienced decline in cognitive capacity without objective cognitive impairment
+ Criterion 2
Intact functional ability
+ Criterion 3
No major depression
+ Criterion 4
No anxiety disorder
Prevalence estimates in % (95%CI)
ActiveAging 27.97 (21.43–34.51) 25.80 (19.40–32.20) 25.73 (19.36–32.10) N/A
CFAS 23.44 (21.77–25.12) 21.59 (19.91–23.26) 17.78 (16.36–19.20) 9.60 (8.63–10.58)
EAS 50.41 (45.20–55.62) 46.06 (41.06–51.06) 38.71 (34.07–43.34) 25.91 (19.33–32.48)
EPIDEMCA 56.28 (54.18–58.38) 53.02 (50.83–55.21) 30.64 (28.51–32.77) 28.41 (26.38–30.44)
ESPRIT 31.26 (29.34–33.18) 28.76 (26.89–30.63) 23.97 (22.20–25.74) 18.94 (17.36–20.51)
Invece.Ab 14.61 (11.64–17.58) 14.03 (10.90–17.17) 12.32 (9.44–15.20) 10.77 (8.28–13.26)
KLOSCAD 55.51 (54.09–56.92) 50.55 (49.10–52.00) 36.01 (34.62–37.40) 35.97 (34.62–37.31)
LEILA75+ 12.89 (11.66–14.13) 11.71 (10.49–12.94) 9.81 (8.65–10.97) N/A
LRGS-TUA 51.23 (48.15–54.31) 47.40 (44.32–50.47) 46.84 (43.80–49.87) N/A
MAAS 65.26 (60.32–70.20) 60.52 (55.34–65.69) 54.97 (49.43–60.51) 52.70 (47.43–57.98)
MoVIES 29.39 (26.97–31.81) 27.20 (24.83–29.57) 23.87 (21.59–26.15) N/A
PATH 11.68 (10.50–12.86) 10.76 (9.62–11.90) 9.63 (8.54–10.73) 7.83 (6.80–8.87)
SGS 18.47 (16.81–20.12) 16.51 (14.93–18.09) 10.24 (8.93–11.54) 9.91 (8.64–11.18)
SLASII 25.48 (23.37–27.59) 22.87 (20.83–24.91) 22.17 (20.16–24.18) 21.18 (19.31–23.05)
SydneyMAS 45.81 (43.41–46.39) 42.72 (40.48–44.95) 35.87 (33.55–38.19) 29.88 (27.54–32.22)
ZARADEMP 44.69 (42.99–46.39) 42.04 (40.32–43.77) 30.64 (28.51–32.77) 28.12 (26.50–29.74)
Total* 37.32 (36.85–37.79) 34.49 (34.02–34.97) 27.75 (27.31–28.20) 25.60 (25.06–26.14)
  1. 95%CI 95% confidence interval, N/A not available
  2. *Unstandardized