Table 1.

Characteristics of participants in the reference group (30–49) and in main analyses (50–90+)

Characteristics	30–49 (n = 70)	50–90+ (n = 420)
Demographics
Age, years, mean (SD) [min, max]	40 (6) [30, 49]	72 (10) [52, 94]
Male gender, no. (%)	36 (51)	228 (54)
Education, years, mean (SD) [min, max]	16 (2) [12, 20]	15 (2) [7, 20]
APOE ε4 positive, no. (%)	5 (19)∗	114 (27)
Biomarker outcomes
PiB, SUVR, mean (SD) [min, max]	1.20 (0.05) [1.10, 1.35]	1.47 (0.33) [1.12, 3.08]
Abnormal PiB (>1.4), no. (%)	0 (0)	154 (37)
Cognition
Short test of mental status score, mean (SD) [min, max]	37 (2) [32, 38]	36 (2) [27, 38]

Abbreviations: SD, standard deviation; PiB, Pittsburgh compound B; SUVR, standardized uptake value ratio.

^∗Several missing APOE genotype.