Table 1. General characteristics of study subjects.

		Frequency or mean	% or SD
Age at initial exposure (months)		15.8	23.4
Fetal exposure		8/24 (only used prenatally: 1/8)	33.3
Sex (male: female)		7:17	29.2:70.8
Intense: intermittent use		9:15	37.5:62.5
Total months of use		14.7	12.7
Diagnostic criteria	Definite	2	8.3
	Probable	2	8.3
	Possible	8	33.3
	Unlikely	12	50.0
Death		1	4.2

SD, standard deviation.