Measure | Method of measurement | Time-point |
---|---|---|
Demographics | ||
Case Report Form: gender, age, socioeconomic status, employment and education status, current weight loss status, current health status, current computer and phone use | Baseline and 12 months | |
Feasibility measures (reflecting progression criteria) | ||
Recruitment | Sample size and rate of recruitment, sources of recruitment | Post baseline |
Randomisation | Interviews with participants and insight from study team | 6 months |
Retention | Retention rates for data collection at 12 months follow-up | 12 months |
Feasibility of app/website (intervention) | Interviews with participants, interviews with helpers, app and website usage statistics, USE [20] questionnaire | 6 and 12 months, 12 months, 12 months and 12 months |
Data collection | Rates of completion for different measures | Baseline and 12 months |
Exploratory primary outcomes | ||
BMI (kg/m2) | Physical measurement of height (m) and weight (kg) | Baseline and 12 months |
Diet | DINE questionnaire [21] (via telephone), 4 days of 24-h dietary recall | Baseline and 12 months |
Physical activity | 7 day accelerometry [22], 7 day Physical Activity Recall Questionnaire [23] | Baseline and 12 months |
Secondary outcomes | ||
Anthropometric changes | Waist and hip circumference (cm) | Baseline and 12 months |
Health-related quality of life | Baseline and 12 months | |
Mental health | General Health Questionnaire (GHQ12) [26] | Baseline and 12 months |
NHS resource use and participant-borne costs | Specially designed resource use questionnaire | Baseline and 12 months |
Social support | Exercise and Eating Habits Social Support Scales [27] | Baseline and 12 months |
Self-efficacy | Baseline and 12 months | |
Motivation | Treatment Self-Regulation Questionnaire [31] | Baseline and 12 months |
Smoking use | Heaviness of Smoking Index (HIS) [32] | 12 months |
Alcohol use | Alcohol Use Disorders Identification Test (AUDIT-C) [33] | 12 months |