Table 2.

Sociodemographic variables, somatosensory and motor functions, and cognition signs, according to hair-MeHg levels (<10 vs. ≥10 µg/g), Sawré Muybu Indigenous Land, Pará state, Brazilian Amazon, 2019.

	Hair-MeHg Levels
Sociodemographic Variables	<10.0 µg/g		≥10.0 µg/g		Total
Sex	n	%	n	%	n	%	p-value
Female	36	47.4	16	48.5	52	47.7	0.915
Male	40	52.6	17	51.5	57	52.3
Total	76		33		109
Age range (years)
12 to 19	26	34.2	10	30.3	36	33.0	0.774
20 to 24	12	15.8	8	24.2	20	18.3
25 to 29	12	15.8	5	15.2	17	15.6
≥30	26	34.2	10	30.3	36	33.0
Total	76		33		109
Somatosensory signs
Distal pinprick perception
Normal	65	85.5	29	87.9	94	86.2	0.743
Abnormal	11	14.5	4	12.1	15	13.8
Total	76		33		109
Distal Thermal Sensitivity
Normal	65	85.5	26	78.8	91	83.5	0.384
Abnormal	11	14.5	7	21.2	18	16.5
Total	76		33		109
Hallux or Thumb Vibration Sensitivity
Normal	71	93.4	28	84.8	99	90.8	0.154
Abnormal	5	6.6	5	15.2	10	9.2
Total	76		33		109
Feet mechanical detection threshold
Normal	62	81.6	22	66.7	84	77.1	0.089
Abnormal	14	18.4	11	33.3	25	22.9
Total	76		33		109
Clinical signs of polyneuropathy (neuropathy burden)
No	53	69.7	21	63.6	74	67.9	0.531
Yes	23	30.3	12	36.4	35	32.1
Total	76		33		109
Motor function
Toe amyotrophy
Absent	71	93.4	33	100.0	104	95.4	0.131
Present	5	6.6	0	0.0	5	4.6
Total	76		33		109
Ankle jerk reflex
Normal	66	86.8	26	78.8	92	84.4	0.287
Abnormal	10	13.2	7	21.2	17	15.6
Total	76		33		109
Bradykinesia
Absent	75	98.7	31	93.9	106	97.2	0.164
Present	1	1.3	2	6.1	3	2.8
Total	76		33		109
Cerebellar incoordination (ataxia)
Absent	76	100.0	31	93.9	107	98.2	0.030
Present	0	0.0	2	6.1	2	1.8
Total	76		33		109
Cognition
Brief Cognitive Screening Battery (BCSB)
Normal	63	82.9	21	63.6	84	77.1	0.028
Abnormal	13	17.1	12	36.4	25	22.9
Total	76		33		109
Stick design test
Normal	75	98.7	32	97.0	107	98.2	0.540
Abnormal	1	1.3	1	3.0	2	1.8
Total	76		33		109
Verbal Fluency test
Normal	70	92.1	26	78.8	96	88.1	0.049
Abnormal	6	7.9	7	21.2	13	11.9
Total	76		33		109