Outcomes | Variable | Measure/source |
---|---|---|
Primary outcome (Aim 1) | Mean difference in % body weight loss | - Weight In Kg (Digital Scale) |
Secondary outcomes (Aim 1) | (1) Goal achievement | |
a. % reaching weight loss goal | - Weight In Kg (Digital Scale) | |
b. % reaching exercise goal | - Sum of min. over 7 days (tracking sheets) | |
(2) Diabetes risk factors | ||
a. Waist circumference | - Tape (cm) | |
b. Hemoglobin A1c | - Immuno assay | |
c. Blood pressure | - Mercury sphygmomanometer | |
d. Total cholesterol/HDL ratio | - Enzymatic assay | |
(3) Physical activity | ||
a. Total duration | - Minutes (online tracking) | |
b. Steps taken | - Pedometers (online tracking) | |
c. Metabolic equivalents | - Ainsworth tables | |
d. Aerobic fitness | - EST (test duration in minutes) | |
Aims 2 and 3 | Habit formation indices: | |
(1) Self-monitoring index | ||
a. Weight | - Days per week (0-7, online tracking) | |
b. Fat grams | - Days per week (0-7, online tracking) | |
c. Calories | - Days per week (0-7, online tracking) | |
d. Physical activity | - Days per week (0-7, online tracking) | |
(2) Behavior change index | ||
a. Fat grams intake | - Daily average (online tracking) | |
b. Calorie intake | - Daily average (online tracking) | |
(3) Habit strength index | - Self-report index of habit strength | |
a. Self-monitoring | ||
b. Behaviors | ||
Moderators | Socio-demographic variables | - Self-report questionnaire |
Age, gender, ethnicity, education, socio-economic status, smoking status |