Objective:

To describe the annual bimonthly distribution of cases of maternal mortality at the national and Yucatan state levels.

Materials and methods:

Retrospective cross-sectional study, which included all direct maternal mortality registries with ICD-10 letter "O" registered in the open access databases of the Mexican Ministry of Health, between 2002-2016. The distribution of expected/observed MM ratio was plotted by bimonthly. Statistical analyses were performed using Stata 14 statistical program.

Results:

In Mexico, an average of 2,549,398 births were recorded between 2002 and 2016, with an average bimonthly birth rate in the state of Yucatan of 3.02 ± 0.32, with maximum values in September and October. Throughout the country, an average annual maternal mortality rate of 1123 cases was recorded between 2002 and 2016. The total number of cases of direct maternal mortality was 17,088 at the national level and 269 in the state of Yucatan (1.57%). In the analysis of bimonthly distribution of cases of maternal mortality, a uniform bimonthly frequency (0.94-1.06) was observed at the national level, while a unimodal distribution was observed in the September-October bimonthly (0.76-1.42) for the state of Yucatan. The relative risk of maternal mortality in the state of Yucatan is significantly higher in September-October bimonthly (RR =0.57- CI95% 0.73:1.00; p < 0.05), period in which almost a quarter of the mortality cases occurred.

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