Follow-up of the air pollution and the human male-to-female ratio analysis in São Paulo, Brazil: a times series study

Follow-up of the air pollution and the human male-to-female ratio analysis in São Paulo, Brazil: a times series study

Author El Khouri Miraglia, Simone Georges Autor UNIFESP Google Scholar
Veras, Mariana Matera Google Scholar
Amato-Lourenco, Luis Fernando Google Scholar
Rodrigues-Silva, Fernando Google Scholar
Nascimento Saldiva, Paulo Hilario Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Universidade de São Paulo (USP)
Abstract Objectives in order to assess if ambient air pollution in urban areas could be related to alterations in male/female ratio this study objectives to evaluate changes in ambient particulate matter (PM10) concentrations after implementation of pollution control programmes in São Paulo city and the secondary sex ratio (SRR).Design and methods A time series study was conducted. São Paulo's districts were stratified according to the PM10 concentrations levels and were used as a marker of overall air pollution. the male ratio was chosen to represent the secondary sex ratio (SSR=total male birth/total births). the SSR data from each area was analysed according to the time variation and PM10 concentration areas using descriptive statistics. the strength association between annual average of PM10 concentration and SSR was performed through exponential regression, and it was adopted as a statistical significance level of p<0.05.Results the exponential regression showed a negative and significant association between PM10 and SSR. SSR varied from 51.4% to 50.7% in São Paulo in the analysed period (2000-2007). Considering the PM10 average concentration in São Paulo city of 44.72g/m(3) in the study period, the SSR decline reached almost 4.37%, equivalent to 30934 less male births.Conclusions Ambient levels of PM10 are negatively associated with changes in the SSR. Therefore, we can speculate that higher levels of particulate pollution could be related to increased rates of female births.
Keywords air pollution
sex ratio
reproductive health
environmental health
SA o pound Paulo
Language English
Sponsor Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Grant number CNPq: 573813/2008-5
: FAPESP - 2008/57717-6
Date 2013-01-01
Published in Bmj Open. London: Bmj Publishing Group, v. 3, n. 7, 6 p., 2013.
ISSN 2044-6055 (Sherpa/Romeo, impact factor)
Publisher Bmj Publishing Group
Extent 6
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000329805500031

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