1 What type of sampling was used? If random sampling was used was it stratified? If random sampling was not used what limitations does this create specifically for the study in your article?
The participants in this study were recruited via media advertisement, support-group meetings, and clinicians’ offices. According to this articles, the participants were stratified based on the time since menopause and randomized to strength and weight training exercise (ST) and comparison group.
2 What was the rate of participation (response rate) in the study? How did the author insure an adequate response rate?
The researchers did not report the response rate for this study. They reported that 249 participants met screening criteria (35-75 years of age, had history of 0, I, II breast cancer, a BMD T-score of -1.0 or less at any of three sites (hip, spine, forearm), were at least 6 months post breast-cancer treatment and 12 months postmenopausal, resided within 100 miles of one o f four research centers and had their physicians ‘permission to participate).
3 Was the overall size of the sample adequate? How do you know?
Honestly, I am not sure if the sample size is adequate. If we think about the
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As far as nterrater reliability, they had registered nurses who were assigned to validate recorded data. Majority of the data was recorded by the participants and the exercise trainers recorded participants’ progress in terms of their weight and strength. As far as validity is concerned, I hope that aforementioned instrumedts that were used in this study were properly calibrated and valid. Since the adherence to the exercise program, the attendance, as well as falls and incidence of fractures were self reported, I vould like to question the validity of the whole project, especially in terms of falls and adherence to the exercise