Shift Work and BMI Correlational Study

1. External Validity Threats

1.1. Selection Bias

1.2. Age of data

2. Internal Validity Threats

2.1. Self reported weight/height

2.2. No direct measure of diet

2.3. No direct measure of physical activity

2.4. Selection bias: Higher BMI to shift work

2.5. Health history influencing BMI

2.6. Non-response for mediating variables

3. Population

3.1. Nurses

3.1.1. Long Term Care Facility

3.1.2. Hospital

3.1.3. Non standard shift workers

3.1.4. Working single job

3.1.5. Not pregnant

4. Sample

4.1. Nurses

4.1.1. Regular Day Shift

4.1.2. Regular Evening Shift

4.1.3. Regular Night Shift

4.1.4. Mixed Shift

4.1.5. Canadian

4.1.6. Not pregnant

4.1.7. Working single job