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Table 1 Measures

From: Increasing the effectiveness of the Diabetes Prevention Program through if-then plans: study protocol for the randomized controlled trial of the McGill CHIP Healthy Weight Program

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