Extract information for meta-analysis from this paper:

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Provide structured data extraction:

## Study Identification
- Authors:
- Year:
- Title:
- Journal/Source:

## Methodology
- Study design:
- Sample size:
- Population/participants:
- Setting:
- Time period:

## Key Variables
- Independent variable(s):
- Dependent variable(s):
- Control variables:

## Main Results
- Primary effect size(s):
- Confidence intervals:
- P-values:
- Statistical tests used:

## Quality Assessment
- Potential biases:
- Limitations noted:
- Generalizability:

## Notes
Any additional relevant information for meta-analysis.
