Table 2.

Epidemiological profiling of participants according to residence location, Brazilian Amazon basin, 2015–2019.

Variables	Residence Location	n	%	Total Hg Level in the Blood (μg/L)
				Mean	Median	Standard Deviation	Min	Max	Kruskal-Wallis
Age range
18–20 (n = 21) *	Riverine	12	57.1	30.4	19.9	33.6	6.9	129.6	χ2 = 9.78 p = 0.0019
	Urban	9	42.9	8.2	6.6	6.1	3.7	23.8
21–40 (n = 178) *	Riverine	98	55.1	45.7	25.0	58.7	1.4	288.3	χ2 = 59.19 p = 0.0001
	Urban	80	44.9	15.4	8.5	27.9	2.3	222.7
41–60 (n = 191) *	Riverine	112	58.6	55.6	28.6	68.8	1.6	296.5	χ2 = 15.92 p = 0.0001
	Urban	79	41.4	28.7	14.9	37.3	1.7	247.1
>61 (n = 62) *	Riverine	31	50.0	53.8	27.0	64.9	5.8	271.9	χ2 = 5.13 p = 0.0235
	Urban	31	50.0	24.7	17.5	21.1	3.3	80.1
Gender
Female (n = 303) *	Riverine	166	54.8	43.6	21.6	59.1	1.4	296.5	χ2 = 36.05 p = 0.0001
	Urban	137	45.2	19.5	10.1	20.0	2.3	102.4
Male (n = 159) *	Riverine	93	58.5	63.3	35.0	70.4	3.3	288.3	χ2 = 44.02 p = 0.0001
	Urban	66	41.5	26.5	11.2	46.0	1.7	247.1
Schooling
Illiterate (n = 12)	Riverine	7	58.4	50.9	14.8	66.8	7.3	185.5	χ2 = 0.53 p = 0.4649
	Urban	5	41.7	38.6	34.8	18.1	21.1	67.3
Elementary education (n = 334) *	Riverine	226	67.7	52.2	27.3	64.5	1.4	296.5	χ2 = 28.16 p = 0.0001
	Urban	108	32.4	28.9	15.4	39.0	1.7	247.1
Higher education (n = 111) *	Riverine	22	19.8	37.8	18.5	63.2	1.6	296.5	χ2 = 15.08 p = 0.0001
	Urban	89	80.2	12.2	8.7	12.8	2.3	82.8
Fish consumption
Daily (n = 146) *	Riverine	128	87.7	50.0	27.3	60.6	6.7	296.5	χ2 = 3.731 p = 0.0534
	Urban	18	12.3	34.8	21.6	54.6	8.4	247.1
Regular (n = 235) *	Riverine	123	47.7	52.9	25.4	68.9	1.4	296.5	χ2 = 14.03 p = 0.0002
	Urban	112	52.3	27.2	14.6	32.5	1.7	222.7
Occasional (n = 76) *	Riverine	7	9.2	28.6	16.6	24.3	1.6	74.9	χ2 = 6.831 p = 0.0090
	Urban	69	90.8	10.4	6.7	11.8	2.4	80.1

* Kruskal–Wallis: Comparison of residence location (urban × riverside) showed a statistically significant result.