Table 1.

Prevalence and descriptive statistics of aflatoxin B₁ (AFB₁) in maize collected from farmers’ fields in eastern and South Western regions of Kenya and proportion of maize samples with AFB₁ levels exceeding maximum tolerable limits in the East African Community (EAC) from 2009 to 2011.

Region	Year	N	Positive samples		Aflatoxin concentration range of positive samples (μg kg−1)	Median (μg kg−1)	Mean ± SD (μg kg−1)	Proportion of positive samples exceeding EAC regulatory limit (≥5 μg kg−1)
			N	%				N	%
Eastern	2009	40	13	32.5	2.0–9091.8	45.7	775.5 ± 2500.2	11	84.6
	2010	193	127	65.8	0.1–1454.8	7.4	39.1 ± 147.5	76	59.8
	2011	183	134	72.2	1.0–581.5	4.9	26.3 ± 71.4	66	49.3
	Total	416	274	65.9	0.01–9091.8	6.2	67.8 ± 558.9	153	55.8
South Western	2010	233	157	67.4	1.0–722.2	6.9	31.0 ± 83.5	93	59.2
	2011	140	76	54.3	0.9–63.1	2.2	4.1 ± 7.7	9	11.8
	Total	373	233	62.5	0.98–722.2	4.01	22.3 ± 69.8	102	43.8
Overall		789	507	64.3	0.01–9091.8	5.2	46.9 ± 413.9	255	50.3