Table 2.

Relative risks (RR)^* and 95% confidence intervals (CI) of ALS in tertiles of baseline serum α-tocopherol^† and β-carotene concentrations

	α-Tocopherol, mg/l			β-Carotene μg/l
Tertiles	1	2	3	1	2	3
Median Range	9.7 (1.4 to 10.7)	11.7 (10.8 to 12.6)	14.0 (12.7 to 110.6)	90 (0 to 130)	171 (131 to 224)	315 (225 to 5686)
No. cases	20	18	12	15	16	19
RR	1.0 (ref)	0.84	0.58	1.0 (ref)	0.97	1.10
95% CI		0.45 to 1.59	0.29 to 1.20		0.48 to 1.97	0.56 to 2.18
P for trend			0.14			0.74

^*Adjusted for age.

^†Adjusted for serum cholesterol.