title: Using the Internet to Support Exercise and Diet: A Stratified Norwegian Survey.
abstract: BACKGROUND
  Internet is used for a variety of health related purposes. Use differs and has differential effects on health according to socioeconomic status.
  
  
  OBJECTIVE
  We investigated to what extent the Norwegian population use the Internet to support exercise and diet, what kind of services they use, and whether there are social disparities in use. We expected to find differences according to educational attainment.
  
  
  METHODS
  In November 2013 we surveyed a stratified sample of 2196 persons drawn from a Web panel of about 50,000 Norwegians over 15 years of age. The questionnaire included questions about using the Internet, including social network sites (SNS), or mobile apps in relation to exercise or diet, as well as background information about education, body image, and health. The survey email was opened by 1187 respondents (54%). Of these, 89 did not click on the survey hyperlink (declined to participate), while another 70 did not complete the survey. The final sample size is thus 1028 (87% response rate). Compared to the Norwegian census the sample had a slight under-representation of respondents under the age of 30 and with low education. The data was weighted accordingly before analyses.
  
  
  RESULTS
  Sixty-nine percent of women and 53% of men had read about exercise or diet on the Internet (χ(2)= 25.6, P<.001). More people with higher education (71%, χ(2)=19.1, P<.001), reported this. The same gender difference was found for using Internet-based interventions with 20% of women compared to14% of men reporting having used these interventions (χ(2)=7.9, P= .005), for having posted a status about exercise or diet on Facebook or other SNS (23% vs 12%, χ(2)=18.8, P<.001), and for having kept an online exercise or diet journal (21% vs 15%, χ(2)=7.0, P=.008). Evaluations of own physical appearance accounted for some of the gender differences in using online exercise or diet journals. Seven percent of the total sample reported having used electronic communication to ask professionals about exercise or diet, while a few more had discussed online with peers (10%). Asking professionals online was more common amongst those with only primary education (13%, χ(2)<10.5, P=.005).
  
  
  CONCLUSIONS
  Gender and education are related to how the Internet is used to support health behaviors. We should be aware of the potential role of the Internet in accelerating social disparities in health, and continue to monitor population use. For Internet- and mobile-based interventions to support health behaviors, this study provides information relevant to tailoring of delivery media and components to user.
authors: Department of Health and Society, Narvik University College, Narvik, Norway. siljecw@gmail.com.
authors: Silje C
authors: http://orcid.org/0000-0001-9501-0989
authors: SC
authors: Wangberg
authors: Tove
authors: http://orcid.org/0000-0003-2018-2748
authors: T
authors: Sørensen
authors: Hege K
authors: http://orcid.org/0000-0001-6254-6023
authors: HK
authors: Andreassen
keywords: Health Behaviors; Health Literacy; Internet; Social Disparities