1. Type of Sampling
1.1. Stratified Random Sampling
1.1.1. Population has characteristics that may affect the outcomes
1.1.1.1. Age
1.1.1.2. Work environment
1.1.1.3. Part/Full time status
1.1.1.4. Ability to complete intervention (Tai Chi class)
1.1.1.5. Education Level
1.1.1.6. Work Requirements
1.1.1.7. Length of time on the job
2. Threats to Internal Validity
2.1. Is it the independent variable (or something else) that causes an effect on or influences the dependent variable
2.1.1. Additional work out regimens not reported
2.1.2. Overall health/previous musculoskeletal issues
3. Threats to External Validity
3.1. Can the findings from this study be generalized to another population?
3.1.1. Elder people with musculoskeletal conditions
3.1.2. Any aged group with a need to increase musculoskeletal abilities
4. Research Design
4.1. Experimental
4.1.1. Seek to test the effectiveness of interventions
5. Population/Sample
5.1. 14 Nurses
5.1.1. 7 Nurses doing Tai Chi
5.1.2. 7 Nurses with no intervention
5.1.3. Working in Academic Health Centers
5.1.4. RNs or LPNs
5.1.5. Older than 40 years
5.1.6. Employed Full or Part Time
5.1.7. Work involves lifting patients
5.1.8. Hold staff nurse positions
5.1.9. Must have worked at least 1 year in study setting
5.1.10. Excluded if they could not participate in the 15 weeks of Tai Chi class