From the parmacoepi point of view, the best risk estimator is the relative risk (RR, event rate in exposed/event rate in non-exposed). This cannot be measured in case-controls studies, because the cases and the controls are independent, and the overall event rates are fixed by the cas/control ratio.
Bay of Campeche. Bay of Campeche, also called Gulf of Campeche, Spanish BahÃ­a de Campeche, bay of the Gulf of Mexico, southern Mexico. It is bounded by the YucatÃ¡n Peninsula to the east, by the Isthmus of Tehuantepec to the south, and by southern Veracruz to the west.
It is also believed that the Chicxulub crater, covering almost half of the peninsula, is the site of the crater impact that killed the dinosaurs some 65 million years ago. There are three Mexican states on this peninsula: Campeche (capital: Campeche), Yucatan (capital Merida) and Quintana Roo (capital Chetumal). Some of the most important cities include Campeche (791,322), Merida (734,153) and Cancun (526,701).