January 10th, 2018
Quantitative article – instruments, methods, strengths & limitations
The study provides appropriate support for the validity of instruments used. For instance, it identifies studies that reinforce the accuracy of dual energy X-ray absorptiometry (DXA) in assessing body composition. Similarly, the accuracy of scales used to assess height and weight in BMI measurement are verified independently from their use in the study. High serum CRP concentrations were also assayed in duplicate to avoid erroneous measurements being included. The instruments were thus appropriate for the study.
Data Collection Methods
Data collection methods employed by researchers were appropriate for the study with appropriate recording used to capture data. The rights of individuals were also catered for with the study having been approved by the university’s review board and informed consent obtained from all participants.
The researchers also conducted appropriate data analyses, sufficient to meet the study’s purpose. For instance, BMI was evaluated according to classification identified by World Health Organization, a global health authority. The classification of obesity under BF % was also informed on previous studies. Sensitivity and specificity analyses based on BF % measure of obesity were also appropriate in identifying the cases of misclassification under BMI.
Strengths and Limitations
The main strengths of the study include the use of a large sample and comprehensive review of literature. A large sample for instance reduces the chance of the researchers making either of the type I and type II statistical errors. Type I error is false negative i.e. rejecting an hypothesis that should have been accepted. Type II error is a false positive, i.e. accepting an hypothesis that should have been rejected. The comprehensive review of literature, apart from offering the basis for the study, also presents support for the methods used in the study.
Two major limitations affect the study’s usability. First, since the sample selection was not randomized, only including male, predominantly Caucasian participants, generalization of results to female officers and other races is not possible. Another limitation arises with choice of the BF % indicator for obesity which has not been validated in extensive research. The authors however make a note of these limitations thus establishing the extent to which their results may be applied.
The study’s finding are valid since the assessment is based on a sound theoretical underpinning with support of the methods used to being drawn from literature. The study’s findings are also practical in nursing since they identify a weakness in the common approach to assessing obesity and identify an approach that can be used to complement the widely used approach at minimum costs, thus bettering the assessment of obesity. Go to conclusion here.