|Self-report measures evaluated as potential secondary outcomes|
|Self-report measures||Measure characteristics|
|aSocio-demographic questions||Age, gender, years of education|
|aTreatment Self-Regulation Questionnaire||12 items comprising three validated sub-scales assessing three dimensions of motivation to use the POWeR intervention (Controlled-External, Controlled-Introjection and Autonomous-Identification + Integration)|
|Food Frequency Questionnaire||Participants report how often they eat 40 food types in a typical day and week. Developed from a validated measure .|
|Godin Leisure Time Physical Activity Questionnaire||4 items assessing time spent on mild, moderate and strenuous activities during the past week|
|EQ-5D (Euroqol)||5 items assessing general health-related quality of life, used to generate Quality Adjusted Life Years for cost-effectiveness analyses.|
|Theory of Planned Behaviour questions||10 items, comprising 2 items assessing each of the Theory of Planned Behaviour  constructs (attitude, subjective norms, perceived behavioural control, and intention) completed twice to assess attitudes relating to using the POWeR eating plan and the POWeR physical activity plan|
|bTherapist perceptions scale||5 items assessing perceptions of the nurse support provider|
|cEating plan acceptability||7 items asking about the acceptability of the eating plan in terms of satiety, taste, cost and difficulty preparing or obtaining foods|
|cPETS Adherence Questionnaire||14 items assessing socially acceptable reasons for non-adherence, followed by 3 items asking how much of the time participants had followed the low calorie eating plan, the low carbohydrate eating plan and the physical activity plan|
|dOther weight loss support||8 items asking about use of other interventions during the past year|
|dPatient Enablement Instrument||6 items assessing perceived ability to cope with weight problem and general health as a result of health care in the past year.|
abaseline only; b6 month follow-up only; c6 and 12 month follow-up; d12 month follow-up only.
Yardley et al.
Yardley et al. International Journal of Behavioral Nutrition and Physical Activity 2014 11:67 doi:10.1186/1479-5868-11-67