Response to Martinez-Novack et al. Comments on Hynes et al. Prevalence of Marijuana Use among University Students in Bolivia, Colombia, Ecuador, and Peru. Int. J. Environ. Res. Public Health, 2015, 12, 5233-5240
نویسندگان
چکیده
We have read with great interest the Comments related to the article entitled " Prevalence of marijuana use among university 20 students in Bolivia, Colombia, Ecuador and Peru " and appreciate the readers' feedback [1]. For our study " Prevalence of marijuana use among university students in Bolivia, Colombia, Ecuador and Peru " [2], a sample size was calculated to meet certain conditions of accuracy and reliability. We doubled this sample size to reach 50 percent response rates from the original sample. Based on our calculations, our target response rate was 50 percent. Response rates in our study are shown in Table 1. Response rates were 43.26 percent of the original sample in 2009 and 31.94 percent in 2012. Response rates in the survey did not reach the target of 50 percent, which is indeed a limitation of the study. The overall response rates were 86.52 percent of the expected sample in 2009 and 63.88 percent in 2012. We present the weighted estimates, which were included in the original article, in Table 2. In addition, we created Table 3 with unweighted estimates of the prevalence of marijuana use in Andean countries. While readers might find unweighted estimates informational, estimates for the weighted sample are more precise because weighting the data tends to inflate sample size [3].
منابع مشابه
Comments on Hynes et al. Prevalence of Marijuana Use among University Students in Bolivia, Colombia, Ecuador and Peru. Int. J. Environ. Res. Public Health 2015, 12, 5233–5240
We have read and analyzed the article entitled "Prevalence of marijuana use among university students in Bolivia, Colombia, Ecuador and Peru". We propose some objective points which could enhance the internal validity of the study (i.e., we suggest to report participation proportions).
متن کاملPrevalence of Marijuana Use among University Students in Bolivia, Colombia, Ecuador, and Peru
Young adults 18 to 25 years old show the highest prevalence of marijuana use in Latin America. This study analyzes the changes in prevalence of marijuana use among university students in the Andean Community (Bolivia, Colombia, Ecuador, and Peru) from two studies carried out in 2009 and in 2012. Data were collected through representative two-stage samples of universities and students in the And...
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1 Department of Cardiology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China; E-Mails: [email protected] (K.L.); [email protected] (J.C.); [email protected] (L.W.); [email protected] (C.W.); [email protected] (D.H.) 2 Heart Center, Peking University People’s Hospital, No.11 South Xizhimen Avenue, Beijing 100044, China 3 Department of Educatio...
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We thank Ahlbom et al., the authors of [1] for their interest in our paper [2]. Since this is an important issue, the letter deserves a comprehensive and thorough response. Some authors use brain tumor incidence data from Sweden to dismiss evidence of an increased risk for brain tumors associated with the use of mobile and cordless (wireless) phones as published in peer-reviewed scientific lite...
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We would like to thank the editors for providing us with the opportunity to respond to the points raised by Dr. García Nieto.[...].
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