You could measure smoking cessation as a person not smoking a cigarette for 1 month, or as a person who has not smoked in a year, or a 50% reduction in the number of cigarettes smoked. Clearly the operational definition of the dependent variable is an important step in the design of the study.Some other health related conceptual variables that have many operational definitions: intelligence, fitness, health, quality of life.ou could measure smoking cessation as a person not smoking a cigarette for 1 month, or as a person who has not smoked in a year, or a 50% reduction in the number of cigarettes smoked. Clearly the operational definition of the dependent variable is an important step in the design of the study.
The majority of influenza vaccines distributed in the United States contain thimerosal as a preservative. However, an increasing amount is thimerosal-free. While the multiple dose vials still have thimerosal to prevent bacterial growth, the single-dose preparations do not.The amount of influenza vaccine that is thimerosal-free is growing every year. Thimerosal contains ethyl mercury. 2  This is a different chemical compound than mercury found in the environment (methylmercury). 3  Thimerosal has been used as a preservative since the 1930s to prevent bacterial growth in vials containing multiple doses of vaccine and other medical products.
No, there are no steroids in SpirivaÂ®. Spiriva contains only one medicine, tiotoprium, which is a long-acting compound that opens up the tubes in the lung by relaxing the smooth muscles found in the respiratory tract. A number of inhaled medicines including the brand name products AdvairÂ® and FloventÂ® do contain a steroid which reduces inflammation when inhaled into the lungs. Inhaled steroids work directly in the lungs but there is the possibility of experiencing steroid side effects in the body.