Factors | Estimates | Heterogeneity | Studies pooled | ||
---|---|---|---|---|---|
Pooled effect size | 95% CI | I 2 | P-value | ||
Older age | 2.97 | 2.12, 3.82 | 89.9% | < 0.001 | |
Being illiterate | 4.20 | 3.12, 5.28 | 94.7% | < 0.001 | |
Substance abuse | 6.28 | 0.73, 11.82 | 99.8% | < 0.001 | |
Advanced stages of the diseases | 4.45 | 3.16, 5.74 | 95.2% | < 0.001 |