QUESTION 4a

Calculate the frequencies in the table below for each of the three forms of abnormal pregnancy outcomes. Use the total number of single fetus pregnancies as the denominator for frequency of abortions and the number of live births for frequency of low birth weight.

Frequencies of Spontaneous Abortions, Low Birth Weight,
and Birth Defects, Love Canal Area, NYSDH Survey
  Adjoining Canal Rest of Canal Area
  97th Street 99th Street closest Wet Dry

 North of Colvin Blvd
Number of women ever pregnant 20 22 49 98 66
Number of single fetus pregnancies 29 50 108 164 125
Number of women with abortions 3 7 16 16 11
Number of abortions 3 12 25 21 11
Frequency of Abortions
Adjusted O/E ratio (1) 1.2 6.0** 3.4** 2.0 -
Adjusted O/E ratio (2) 0.7 1.5 1.5* 0.8 --
Number of women with live births 19 21 44 92 64
Number of live births 26 39 83 144 110
Number of women with Low Birth Weight (LBW) births 0 1 10 6 3
Number of LBW births 0 1 13** 11 3
Frequency of LBW births
Number of women with Birth Defect (BD)children 0 4 7 7 7
Number of BD children 0 4 10 7 8
Frequency of BD children

* P < 0.05
** P < 0.01
(1) Expected frequency from north of Colvin Boulevard
(2) Expected frequency from Warburton and Fraser (1963)

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