Journal of Medical Internet Research - International Scientific Journal for Medical Research, Information and Communication on the Internet #Preprint #PeerReviewMe: Warning: This is a unreviewed preprint. Readers are warned that the document has not been peer-reviewed by expert/patient reviewers or an academic editor, may contain misleading claims, and is likely to undergo changes before final publication, if accepted, or may have been rejected/withdrawn. Readers with interest and expertise are encouraged to sign up as peer-reviewer, if the paper is within an open peer-review period. Please cite this preprint only for review purposes or for grant applications and CVs (if you are the author). Background: There has been a rapid rise in the popularity of electronic cigarettes (e-cigarettes) over the last decade, with growth predicted to continue. The uptake of these devices has escalated despite inconclusive evidence of their efficacy as a smoking cessation device and unknown long term health consequences. As tobacco smoking rates continue to drop or plateau in many well developed countries transnational tobacco companies have transitioned into the vaping industry and are now using social media to promote their products. Evidence suggests that e-cigarettes are being marketed on social media as a harm reduction alternative with retailers and manufactures utilising marketing techniques historically used by the tobacco industry. Objective: To identify and describe the messages presented in e-cigarette related social media (Twitter, YouTube, Instagram and Pinterest) promotions and discussions, and identify future directions for research, surveillance and regulation. Methods: Data sources included Medline, Scopus, ProQuest, Informit, Journal of Medical Internet Research and Google Scholar. Studies must have been published in English between 2007 and 2017, analyse content captured from e-cigarette related social media promotions or discussions, and report results for e-cigarettes separately to other forms of tobacco and nicotine delivery. Database searching ceased October 2017. Initial searching identified 536 studies. Two reviewers screened studies by title and One reviewer examined 71 full texts to determine eligibly and identified 25 studies for inclusion. This process was undertaken with the assistance of the online screening and data extraction tool - Covidence. The review was registered with The Joanna Briggs Institute Systematic Reviews database and followed the methodology for JBI Scoping Reviews. Results: Several key messages are being used to promote e-cigarettes including as a safer alternative to cigarettes, efficacy as a smoking cessation aid, and for use where smoking is prohibited. Other major marketing efforts aimed at capturing a larger market involve promotion of innovative flavouring and highlighting the public performance of vaping. Discussion and promotion of these devices appears to be predominantly occurring among everyday people and those with vested interests such as retailers and manufacturers. There is a noticeable silence from the public health and government sector in these discussions on social media. Conclusions: The social media landscape is being dominated by pro-vaping messages disseminated by the vaping industry and vaping proponents. The uncertainty surrounding e-cigarette regulation expressed within the public health field appears not to be reflected in ongoing social media dialogues, and highlights the need for public health professionals to interact with the public to actively influence social media conversations and create a more balanced discussion. With the vaping industry changing so rapidly real time monitoring and surveillance of how these devices are discussed, promoted, and reportedly used on social media is necessary in conjunction with evidence published in academic journals.

Objective This study is a systematic review of the peer-reviewed literature to identify the correlates of mobile screen media use among children aged 8 years and less. Setting Home or community-based studies were included in this review while child care or school-based studies were excluded. Participants Children aged 8 years or less were the study population. Studies that included larger age groups without subgroup analysis specific to the 0–8 years category were excluded. Eight electronic databases were searched for peer-reviewed English language primary research articles published or in press between January 2009 and March 2017 that have studied correlates of mobile screen media use in this age group. Outcome measure Mobile screen media use was the primary outcome measure. Mobile screen media use refers to children’s use of mobile screens, such as mobile phones, electronic tablets, handheld computers or personal digital assistants. Results Thirteen studies meeting the inclusion criteria were identified of which a total of 36 correlates were examined. Older children, children better skilled in using mobile screen media devices, those having greater access to such devices at home and whose parents had high mobile screen media use were more likely to have higher use of mobile screen media devices. No association existed with parent’s age, sex and education. Conclusion Limited research has been undertaken into young children’s mobile screen media use and most of the variables have been studied too infrequently for robust conclusions to be reached. Future studies with objective assessment of mobile screen media use and frequent examination of the potential correlates across multiple studies and settings are recommended. Trial registration number This review is registered with PROSPERO International Prospective Register of Ongoing Systematic Reviews (registration number: CRD42015028028).

This study investigated attrition in a 6-month physical activity intervention for older adults. The program was based on the social-cognitive theory incorporating self-efficacy factors. Two hundred forty-eight insufficiently active 65- to 74-year-olds were recruited from the Australian federal electoral roll. The intervention comprised walking and strength and flexibility exercises and was conducted in 30 local neighborhoods where the participants resided. Characteristics of individuals lost to attrition (n = 86, 35%) were compared with those of program completers (n = 162, 65%). Logistic-regression analysis showed that those lost to attrition came from areas of lower socioeconomic status, were overweight and less physically active, and had lower walking self-efficacy scores and higher loneliness scores. The results suggest that early assessment of these characteristics should be undertaken to identify individuals at risk of attrition, to improve retention, and to avoid potential bias.

This is the first study in the Asia-Pacific region to examine the criterion validity of the self-reported International Physical Activity Questionnaire–Short form (IPAQ-SF) using accelerometers, in terms of achieving the World Health Organization’s (WHO) recommended physical activity guidelines for health benefits. Vietnamese adults aged 40–65 years ( n = 240) wore an ActiGraph GT3X⁺ accelerometer for at least 5 days and completed the Vietnamese version of the IPAQ-SF. Correlations between IPAQ-SF and accelerometer-measured physical activity intensities varied from .087 to .232. Mean difference in moderate–vigorous physical activity was 0.699 min/day (95% limits: [−107, 109]). Agreement on the classification of achieving the WHO’s physical activity guidelines was 69.16%. The IPAQ-SF identified 71.86% of adults who met the guidelines, whereas 56.09% of those not meeting the guidelines were classified correctly. The IPAQ-SF was found to have acceptable criterion validity and is a useful instrument to classify Vietnamese adults as achieving or not achieving the WHO’s physical activity guidelines for health benefits.