Video games and obesity
The materials required for the science fair project experiment:
- 200 children aged between 15 and 18 years old
- a measuring tape
- a flat wall
- a weighing machine
- 1 roll of masking tape
1. For this science fair project, the independent variable is the number of hours the participants spend playing video game per week. The dependent variable is the Body Mass Index (BMI) of the participant. This is determined by calculating the BMI of the participant after measuring their height and weight. The constants (control variables) are the age of the participants and the number of participants in each group.
2. The measuring tape is fixed to the wall using masking tape. A weighing machine is placed beside it so that the weight of the participant can be taken immediately after checking the participant's height.
3. The participants are individually interviewed to find out the number of hours they spend per week playing video games. Based on the number of hours spent playing video games, they are then divided into 4 groups as follows :
a. less than 30 hours per week
b. between 30 hours and 40 hours per week
c. between 40 hours and 50 hours per week
d. over 50 hours per week
The number of persons in each group is then counted and recorded in the table given below.
4. Next, measure the participants' heights. Their weight is measured next in kilograms. Using the formulae given below, the participant’s Body Mass Index (BMI) is calculated. Using the BMI value and the information given below, it is determined whether the participant has a normal weight, is overweight or obese.
BMI = [weight (kg)]/ [height (m) x height (m)]
BMI less than 18.5 – underweight
BMI between 18.6 and 24.9 – normal
BMI between 24.9 and l 29.9 – overweight
BMI more than 30.0 – obese
5. The number of obese, overweight and normal participants for each group is totaled and recorded in the table given below.
Basic safety requirements