Asthma is a chronic lung disease caused by inflammation of the lower airways and episodes of airflow obstruction. Asthma episodes or attacks can vary from mild to life-threatening. In 2007, about 7% percent of the U.S. population was diagnosed with asthma and there have been a growing number of new cases since that time. There are several known risk factors identified as triggers of asthma symptoms and episodes, including inhalation of allergens or pollutants, infection, cold air, vigorous exercise, and emotional upsets. There is also growing evidence relating body-mass index to asthma in both children and adults. Design a study to investigate whether there is such an association.
Choose a study design and justify the reasons you chose the design over others.
Select a statistical measure you would use to describe the association (if there is one) between body mass index and asthma.
In addition, address:
Subject selection
Issues relating to the measurement of both the exposure and the outcome
Potential biases that the study might be prone to, and how they might be handled
Possible confounding factors and effect modifiers and how to overcome their effect
Present the information in a 750-1000-word report, using section headings where each requirement is described and justified under each of the following headings: Study Design, Statistical Measures, Subject Selection, and Measurement Issues.
Refer to the "Key Elements of a Research Proposal." (See below)
You are required to use a minimum of three scholarly resources.
Prepare this assignment according to the APA guidelines found in the APA Style Guide, located in the Student Success Center. An abstract is not required.
This assignment uses a grading rubric. Instructors will be using the rubric to grade the assignment; therefore, students should review the rubric prior to beginning the assignment to become familiar with the assignment criteria and expectations for successful completion of the assignment.
You are required to submit this assignment to Turnitin.
I would like to know which study design you choose before you begin, please.
Key Elements of a Research Proposal
If you need a review of study design components, view the resources below.
Review the Key Elements page of the Research Methods Knowledge Base website at
Key Elements of a Research Proposal
Background / purpose / rationale of the study
Literature review
Hypothesis/key questions
Research objectives
Research methods
• Study design
• Statistical bias
• Procedures/timeline
o Specific steps to be taken to complete the study
o Instruments/data collection methods
o Outcomes
• Proposed data analysis plan
o Statistical analyses planned
o Power analysis if appropriate
• Data safety monitoring if appropriate
Study participants
• Description of participates
• Recruitment of participates
• Confidentiality/human subject’s protection/legal-ethical issues (if appropriate)
• Sampling / rationale
o Inclusion/exclusion criteria
o Number of subjects
Statistical Analysis (only if applicable)
Anticipated Results and Potential Pitfalls
Implications for Practice

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Body mass index (BMI) readings are linkable to increased asthma rates in several studies. For example, Nystad et al (2004) found that individuals with BMIs between 25 and 29 in Norway had slightly higher risks of contracting asthma, while individuals with BMIs over 30 had significantly greater risks. In Nyland et al’s (2004) classification, the term ‘overweight’ applies to individuals between ages 14 and 60 with a BMI between 25 and 29, while the term ‘obese’ applies to individuals with a BMI over 30. Taylor et al (2008) found that this pattern was also true in the United States “after adjusting for potential confounders” such as medication, hospitalization and the unwillingness to report symptoms. Jones & Nzekwu (2006) found that respiratory capacities for obese individuals were lower than those for healthy individuals, explaining an underlying physical cause for higher asthma rates in obese adults...

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