A control variable is the one that stays the same. A controlled variable is a variable that is kept the same between the control group and experimental group, so that only the â¦ experimental (independent) variable is allowed to change.+ 41 others found this useful.hat are kept constant to ensure that it is only the Independent Variable causing an effect on the Dependent Variable. 2 people found this useful. Edit. Share to: 1  A Look at JavaScript Variable Types Similar to other programming languages, JavaScript variables are containers used to hold values and expressions.
Each day 11 Americans die from asthma. There are more than 4,000 deaths due to asthma each year, many of which are avoidable with proper treatment and care. In addition, asthma is indicated as contributing factor for nearly 7,000 other deaths each year. Since 1980 asthma death rates overall have increased more than 50% among all genders, age groups and ethnic groups. The death rate for children under 19 years old has increased by nearly 80% percent since 1980.
1 According to WHO estimates, 235 million people suffer from asthma. 2  Asthma is the most common chronic disease among children. 3  Asthma is not just a public health problem for high income countries: it occurs in all countries regardless of level of development.