Table 1.

Baseline characteristics of case and control groups (n 67)

Parameter	Number patients	Mean patients	Standard error	Number controls	Mean controls	Standard error
Age participants	67	40.5	1.3	67	45.7	1.4
Age males	37	38.6	1.4	33	46.4	1.7
Age females	30	42.9	2.4	34	45.0	2.2
Body mass index (BMI)	53	30.0	1.2	66	26.7	0.6
Right hand dominance %	65	92.6	2.1	67	93.1	1.7
Urine creatinine (mmol/L)	66	9.2	0.7	67	9.5	0.7
% hydroxyl indole acetic acid (5-HIAA)	66	4.3	0.8	67	1.6	0.1
Plasma homocysteine (umol/L)	66	10.0	0.3	66	9.5	0.3
Red cell acetylcholine esterase (U/gb Hb)	61	39.8	0.7	67	39.6	0.7
Hearing threshold (Db)	60	533.3	33.3	64	515.6	24.8
Visual threshold of near vision	61	6.3	0.5	67	5.2	0.1