Table 3.

Estimated slope (s) and statistical significance of a multiple regression for AAMA and GAMA in µg/L considering age and distribution of sexes as covariates and for populations including (top) or excluding (bottom) studies with values estimated from blood samples. Estimations from blood levels were not performed for GAMA (due to regional variance of estimation factors). ***: $p<0.0001$, **: $p<0.001$, *: $p<0.05$, n.s.: not significant.

	Counts (N)	Variable	AAMA vs. Sampling Year	GAMA vs. Sampling Year
including estimated values	5245	Sampling year	s: 2.09, ***	-
		Age	s: −0.49, **	-
		Sex	s: 0.21, n.s.	-
excluding estimated values	4202	Sampling year	s: 1.91, **	s: 0.12, n.s.
		Age	s: −0.45, *	s: −0.07, n.s.
		Sex	s: 0.12, n.s.	s: −0.06, n.s.