Our objective was to assess extrinsic influences upon childbirth. In a cohort of 1,826 days containing 17,417 childbirths among them 13,252 spontaneous labor admissions, we studied the influence of environment upon the high incidence of labor (defined by 75th percentile or higher), analyzed by logistic regression. The predictors of high labor admission included increases in outdoor temperature (odds ratio: 1.742, P = 0.045, 95%CI: 1.011 to 3.001), and decreases in atmospheric pressure (odds ratio: 1.269, P = 0.029, 95%CI: 1.055 to 1.483). In contrast, increases in tidal range were associated with a lower probability of high admission (odds ratio: 0.762, P = 0.030, 95%CI: 0.515 to 0.999). Lunar phase was not a predictor of high labor admission (P = 0.339). Using multivariate analysis, increases in temperature and decreases in atmospheric pressure predicted high labor admission, and increases of tidal range, as a measurement of the lunar gravitational force, predicted a lower probability of high admission.
e Nair, que com vocês, eu sou uma pessoa melhor. À Elisângela Carla Silva Campos pela sua amizade e valiosa contribuição no banco de dados desta pesquisa. A toda equipe médica do Centro Obstétrico pela colaboração e atenção. À Profª Natalúcia Matos de Araújo, Mestre em Enfermagem, sempre presente em meu coração, pelo apoio e amizade. À Creusa Dal Bo pela valiosa orientação estatística. Ao Ricardo Chida pelo socorro para solucionar as funções dos programas de Excel e Acess. Ao Claudinei Biazoli pelo auxílio no programa Statistica. A todas as mulheres que participaram do estudo pela valiosa contribuição para a nossa ciência. A todos os meus amigos da Igreja Evangélica Holiness do Bosque da Saúde, pelo apoio e principalmente às minhas amigas Kumiko Kissimoto,
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