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.
The prevalence of a disease is the proportion of a population that are cases at a point in time. For example, the prevalence of systemic lupus erythematosus may stated to be 7 per 1000. The group measured can be defined more narrowly, as: the prevalence of diabetes mellitus in women ages 50 to 60 is 7%.