Int. J. Environ. Res. Public Health 2010, 7 2.3. Health & Wellbeing Questionnaire 7 The health & wellbeing questionnaire included socio-demographic information (e.g., gender, age, and financial situation), self-reported health data, as well as questions related to health behaviours (nutrition, physical activity, smoking and alcohol consumption), social support, quality of life and university study related questions. These items were adopted from published questionnaires [52-56]. Below, we detail only those variables that were significant when we used bivariate linear regression to screen all health related and socio-demographic variables of the questionnaire for statistically significant associations with module mark (grade) as educational outcome. Income sufficiency (1 item): measured using the question adapted from Stock et al. [57] ―Would you say the amount of money you have is…‖, with a four-point response scale (1 = ‗always insufficient‘, 4 = ‗always sufficient‘). Frequency of binge drinking (1 item): measured using the question—―Over the LAST 30 DAYS: How many times (if any) have you had five or more drinks in a row? (A ―drink‖ is a glass of wine (ca 15 cl), a bottle or can of beer (ca 50 cl), a shot glass of spirits (ca 5 cl) or a mixed drink, with answer options ‗none‘, ‗1‘, ‗2‘, ‗3−5‘, ‗6−9‘, or ‗10 or more‘ times [58]. Sleep disorder/insomnia (1 item out of a battery of 8 health complaints): Respondents rated the question: ―How often have you had sleep disorder/insomnia during the past 12 months?‖ on a four-point response scale (1 = ‗never‘; 4 = ‗very often‘), adopted from the symptoms checklist of the German Youth Health Survey [59]. General health (1 item): students gauged their current general health using the question: ―How would you describe your general health?‖ with a five-point response scale (1 = ‗poor‘, 5 = ‗excellent‘) (adopted from [60]). Health awareness (1 item): A related item asked students about their general awareness of their health [56]: ―To what extent do you keep an eye on your health?‖, witha four-point response scale (1 = ‗not at all‘, 4 = ‗very much‘). Educational achievement (2 items): the health questionnaire contained two items on students‘ educational achievement: ―How important is it for you to have good grades at university?‖(four response categories, from 1 = ‗not at all important‘ to 4 = ‗very important‘); and ―How do you rate your performance in comparison with your fellow students?‖ (five response categories, from 1 = ‗much worse‘ to 5 = ‗much better‘). 2.4. Statistical Analysis Data analysis was undertaken employing the software Statistical Package (SPSS). The datasets from both surveys were merged using student number as identifying variable. Principal component analysis: in order to make the data of the student satisfaction questionnaire more manageable, principal component analysis (PCA, Varimax rotation) [61] was undertaken on the satisfaction questionnaire items to determine the number and composition of underlying dimensions to be used in subsequent analyses, by merging the original 27 questionnaire items into meaningful constructs. The PCA resulted in a four factor solution: Factor 1 (the overall quality of the teaching and the module content—9 items); Factor 2 (practical aspects and work load of the module—6 items);