Table 2.

Summary of amyloid beta (Aβ) 38, 40 and 42 levels in plasma samples from cognitively unimpaired individuals.

				Age	Sex
Aβ:	N:	Median (range):	Mean ± S.D.:	(r; p-value):	(p-value):
Aβ38	53	115.2 (4.93–2805)	312.2 ± 524.7	0.075; 0.598	0.780
Aβ40	66	188.2 (34.5–462.7)	197.7 ± 71.0	0.387; 0.001	0.297
Aβ42	66	10.42 (3.715–185.3)	21.1 ± 30.1	0.214; 0.084	0.847

N=number of samples where the Aβ species measured was above the detection limit, excluding the three high outliers. All samples were above the detection limit for Aβ40 and Aβ42⊡ S.D., standard deviation. Bold font denotes statistically significant correlation using Spearman correlations analysis. Sex associations were determined by Mann-Whitney U test.