We then examined individual three-digit ICD-9 codes for
hospital admissions for the two main target organs of inorganic
mercury toxicity—the nervous system and the kidney. Table 5
shows results for psychiatric and neurological disorders. Two
models that did not satisfy the proportionality assumption were
excluded. These were acute reaction to stress (ICD-9: 308,
13 cases) and conduct disturbance not elsewhere identified
(ICD-9: 312, 7 cases). Four conditions had CI excluding the null
value: other paralytic syndromes (ICD-9: 344) and mononeuritis
of the upper limb and mononeuritis multiplex (ICD-9: 354) had
elevated HR; adjustment reaction (ICD-9: 309) and inflammatory
and toxic neuropathy (ICD-9: 357) had reduced HR.