A sea captain, ship's captain, captain, master, or shipmaster, is a high-grade licensed mariner in ultimate command of the merchant vessel. The captain is responsible for its safe and efficient operation, including: ship's seaworthiness, ship's safety and security conditions, cargo operations, navigation, crew management and ensuring that the vessel complies with local and international laws, as well as company and flag state policies. All persons on board, particularly during navigation, includ
1 âPrevalenceâ is the proportion of a population who have (or had) a specific characteristic in a given time period â in medicine, typically an illness, a condition, or a risk factor such as depression or smoking.
It is thus a proportion, rather than a rate, although you may sometimes see it called a rate.. Prevalence provides a good way to indicate the burden of disease in a population. It is influenced by the incidence and by the duration of the condition: under most circumstances, prevalence = incidence Ã disease duration. MORTALITY RATE. The number of deaths per thousand population per year: in effect, the incidence of death in a population. It can refer to all causes of death, or can be a cause-specific mortality rate.