(b)Refer to the socioeconomic data and choose the ‘‘lower’’ group as
the baseline. Calculate the odds ratio associated with every other
group. Is it true, in general, that the poorer the mother, the higher
the risk?
(c)Refer to the socioeconomic data. Calculate the generalized odds and
give your interpretation. Does this support the conclusion in part
(b)?1.39 Sudden infant death syndrome(SIDS), also known as sudden unexplained
death, crib death,orcot death, claims the lives of an alarming number of
apparently normal infants every year. In a study at the University of
Connecticut School of Medicine, significant associations were found
between SIDS and certain demographic characteristics. Significant asso-
ciations were found between SIDS and certain demographic character-
istics. Some of the summarized data are given in Table E1.39. (Expected
deaths are calculated using Connecticut infant mortality data for 1974–
1976.)
TABLE E1.39
Number of Deaths
Observed Expected
Gender
Male 55 45
Female 35 45
Race
Black 23 11
White 67 79(a)Calculate the standardized mortality ratio (SMR) for each subgroup.
(b)Compare males with females and blacks with whites.1.40 Adult male residents of 13 counties in western Washington in whom
testicular cancer had been diagnosed during 1977–1983 were interviewed
over the telephone regarding their history of genital tract conditions,
TABLE E1.40
Religion Vasectomy Cases Controls
Protestant Yes 24 56
No 205 239
Catholic Yes 10 6
No 32 90
Others Yes 18 39
No 56 9652 DESCRIPTIVE METHODS FOR CATEGORICAL DATA