Table 3.

Approaches to analysis

Results reported	Canivano and Gracia [10]	HTA report [8]	Li et al. [15]	Krasopoulos et al. [11]	Pusch et al. [12]	Snoep et al. [13]	Sofi et al. [14]	Wisman et al. [16]
Narrative/results tabulated only	✓				✓
Tabulated by PFT					✓
Forest plot (no pooling)		✓
Meta-analysis (fixed effect)			✓	✓
Meta-analysis (random effects)			✓ (As sensitivity analysis)			✓	✓	✓
Pooled RR			✓ (As sensitivity analysis)				✓	✓
Pooled OR			✓	✓		✓
HRs reported		✓ (Not pooled)
Meta-analysis by PFT				✓ (For some)			✓	✓
Meta-analysis by outcome				✓		✓		✓
Meta-analysis by mono- or dual therapy				✓				✓
Meta-analysis by duration of follow-up							✓	✓
Meta-analysis by aspirin dose				✓		✓	✓	✓
Meta-analysis by population							✓	✓
Sensitivity analysis (quality)								✓
Results by different thresholds presented		✓
Adjusted/unadjusted results presented		✓