Retrospective study on the 'sex ratio at birth' in Western Sydney Local Health District between 2011 and 2020.

The SRB by mother’s country of birth was borderline significant (p=0.09, table 1 ), with mothers born in China displaying an SRB of 1.12 compared with 1.05 for mothers born in Australia ( table 1 )—increasing parity did not, however, appear to affect this finding (likelihood ratio test, p=0.36, table 2 ).

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