Subgroup | Number of analyses | OR (95% CI) | p-value | I2 (%) |
---|---|---|---|---|
All Analysesa | 50 | 1.07 (1.03, 1.12) | 0.002 | 97.6 |
Date of publicationb | ||||
• Pre-October 13th 2015c | 30 | 1.09 (1.02, 1.17) | 0.009 | 97.5% |
• Post-October 13th 2015 | 20 | 1.06 (1.03, 1.09) | < 0.001 | 84.0% |
Study sample size | ||||
• Less than 10,000 | 15 | 1.03 (0.89, 1.18) | 0.72 | 57.9% |
• 10,000 to 100,000 | 15 | 1.08 (1.04, 1.13) | < 0.001 | 57.1% |
• 100,000 to 1,000,000 | 8 | 1.08 (1.04, 1.30) | 0.001 | 81.9% |
• Over 1,000,000 | 12 | 1.11 (1.02, 1.21) | 0.015 | 99.4% |
Database type | ||||
• Administrative | 41 | 1.09 (1.04, 1.15) | < 0.001 | 98.0% |
• Clinical registry/audit | 9 | 1.03 (0.98, 1.09) | 0.25 | 57.8% |
Measure of severity | ||||
• No measure of severity | 37 | 1.08 (1.03, 1.14) | 0.004 | 98.2% |
• Measure of severity | 13 | 1.06 (1.02, 1.10) | < 0.001 | 43.5% |