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Occup Environ Med 60:704 doi:10.1136/oem.60.9.704
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Sex ratio at birth and exposure to petrochemicals

Table 1

Association between the combination of GST genotypes of mothers and offspring sex ratio in polluted areas of MIS

Genotype
GSTM1 GSTT1 Sons Daughters χ2* p value
χ2 was performed using sex ratio equal to 0.504 in general population of MIS.
*df=1
Present Present 12 14 0.186 0.666
Present Null 24 10 5.601 0.018
Null Present 46 45 0.000 1.000
Null Null 30 33 0.206 0.650

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