Zusammenfassung Ziel derstudies that aimed at decreasing alcohol consumption by the use of the Internet were conducted in college or university students from the United States or New Zealand and the majority of these studies were based on the social norms approach. Good empirical evidence exists concerning the efficacy of web-based social norms interventions to decrease alcohol consumption in students. In the field of smoking cessation, Internet interventions are much more heterogeneous concerning the target group and the provided interventions. So far, five controlled studies concerning Internet interventions for smoking cessation in adolescents are available, two of these studies were effective in decreasing the smoking prevalence at the last follow-up. Interventions using mobile phone text messaging for smoking cessation were well accepted and promising; however, they were primarily tested within pilot studies and conclusions about their efficacy are not possible so far. Conclusion: Suggestions for the implementation of certain intervention approaches in Germany could not be derived from the existing studies. For research in Germany, it is suggested to work on the following topics: (1) testing the efficacy of web-based social norms interventions to decrease alcohol consumption in student and non-student samples, (2) testing the efficacy of Internet interventions for smoking cessation, and (3) testing the efficacy of text messaging interventions for smoking cessation.

The methods of reaching families for a home intervention trial (HIT) were analyzed in this study. The study aimed to reduce environmental tobacco smoke exposure among infants in one region of Germany. The systematic screening data of smoking among families in their homes were compared with reference data of a representative household sample of the state in which the study was conducted. The characteristics of participating and non-participating families were analyzed. All households (N = 3,570) containing at least one infant age 3 years or younger were selected using the residents` registration files and invited to participate in a screening assessment. Among these families, 3,293 (92.2 %) were contacted and from that group, 2,641 families participated in the screening. Compared with the reference sample, the screened sample included a higher proportion of families with employment and with more than 10 years of education. Participation in the HIT was recommended if at least one parent reported smoking one or more cigarettes per day during the previous 4 weeks. Among the 1,282 families that met the inclusion criteria, 71.5 % took part in the screening. Participating families, compared with non-participating families, were older, included more families with two parents living in the household, and had higher rates of employment. The effect size of the final regression model was small (Cohen's f (2) = 0.01). In conclusion, proactive approaches that are delivered at home may yield a high reach of the target population and particularly of socioeconomically disadvantaged populations.

The results of the linear regression model demonstrate a higher importance of body and behaviour-related factors and places and confirm the relevance of past prevention and health promotion in the named areas also for the HRQOL of the girls.

Differences in participation in the screening procedure are low: a high proportion of families in districts with a high PPSW took part. Even in districts with a PPSW rate of more than 30%, 71.3% of the families were successfully contacted. There is the recommendation to offer prevention measures in social< deprived city areas in a more proactive way considering the association between the prevalence of smoking in families and the proportion of PPSW.