Table 9.

Score of signs and symptoms in each area (n = 1115).

	Control Area	Minamata Area	Northern Area	Southern Area	Other Areas
	(n = 142)	(n = 259)	(n = 279)	(n = 246)	(n = 189)
Symptom score (always)
Mean ± SD	0.2 ± 0.5	5.1 ± 4.9	6.1 ± 5.0	6.9 ± 5.4	5.3 ± 4.9
Range (min–max)	0–3	0–22	0–23	0–22	0–23
Symptom score (always and sometimes)
Mean ± SD	3.2 ± 3.0	21.2 ± 9.2	23.3 ± 9.0	24.7 ± 9.2	21.9 ± 9.4
Range (min–max)	0–15	2–45	1–46	3–45	2–46
Cranial nerve score
Mean ± SD	0.2 ± 0.6	1.1 ± 1.7	1.1 ± 1.5	1.4 ± 1.8	1 ± 1.5
Range (min–max)	0–2	0–6	0–6	0–6	0–6
Upper, lower ataxia and tremor score
Mean ± SD	0.1 ± 0.4	1.0 ± 1.2	1.3 ± 1.5	1.3 ± 1.5	1.1 ± 1.4
Range (min–max)	0–3	0–5	0–5	0–5	0–5
Truncal ataxia score
Mean ± SD	0.9 ± 1.0	2.5 ± 1.7	2.7 ± 1.6	2.7 ± 1.6	2.4 ± 1.6
Range (min–max)	0–3	0–5	0–5	0–5	0–5
Sensory score
Mean ± SD	0.0 ± 0.2	2.4 ± 1.5	2.6 ± 1.5	2.2 ± 1.3	2.3 ± 1.2
Range (min–max)	0–2	0–6	0–6	0–6	0–5
Total neurological score
Mean ± SD	1.2 ± 1.4	6.9 ± 4.5	7.7 ± 4.2	7.6 ± 4.3	6.8 ± 4.0
Range (min–max)	0–8	0–20	0–21	0–21	0–19