Dakota City, Nebraska
ducted a health investigation using neurobehav-
No difference was observed in performance on
ioral tests to measure possible nervous system
four tests for both the target and comparison
toxicity. The purpose of the investigation was to
groups. Exposure to hydrogen sulfide was asso-
evaluate whether people exposed to hydrogen
ciated with marginally poorer performance for
sulfide had poorer neurobehavioral health when
a test of memory (match to sample score) and a
compared with unexposed persons.
test of strength (grip strength). However, these
differences were not statistically significant.
Analyses were conducted on 335 participants'
Deficits in overall neurobehavioral performance
records (171 target and 164 comparison par-
were not associated with exposure to hydrogen
ticipants' records). Results indicated the two
sulfide in this study.
groups were generally similar for demographic
characteristics, various self-reported medical
conditions, and lifestyles. The results of neu-
robehavioral tests for target and comparison
groups were generally similar. For the adjusted
analysis, age was an important covariate of test
performance, followed by educational level and
language of testing.
Relative to the comparison group, the target
group demonstrated mixed performance on tests
within and across the four neurologic domains
tested. The target group performed better on
seventeen tests and poorer on seven tests, but
the magnitude of these differences was small.
chapter 3 49