| Level of evidence | Standard error |
---|
 |  | All-cause mortality |
---|
Byrne-Quinn [60] | 1d | 2.02 |
Hillestad [61] | 1d | 2.00 |
Karlson [62] | 1d | 1.42 |
Lloyd [63] | 1d | 1.55 |
PAFAC [64] | 1b | 0.78 |
Sodermark [65] | 1d | 0.73 |
SOPAT [66] | 1b | 1.51 |
Steinbeck [67] | 1d | Z |
Lafuente-Lafuente [59] | 1c | 0.43 |
- Z: outcome with zero-events in both treatment arms which makes SE incalculable
- In this example the formulas for SE of lnORpeto,i for individual studies and SE of lnORpeto for meta-analysis were used.