Treatment relative effect with 95% CI; and degree of certainty (adaptated from GRADE).
            
                
                method
            
        
        
            
                | Treament | Trials |  |  | 
            
                | clinical deterioration | clinical improvement | deaths | viral clearance | 
            | IFN alpha | 2 | 0.52 [0.02; 15.78], 1 RCT, I2=0% inconclusive result
 | 1.28 [0.53; 3.09], 2 RCTs, I2=54% demonstrated inconclusive result
 | 1.93 [0.24; 15.47], 3 RCTs, I2=0% inconclusive result
 | 2.90 [1.64; 5.14], 3 RCTs, I2=0% moderate  degree of certainty
 |  | 
| SNG001 inhaled interferon beta | 2 | 0.65 [0.42; 1.00], 2 RCTs, I2=0% inconclusive result
 | 2.32 [1.07; 5.04], 1 RCT, I2=0% unassessable degree of certainty
 | 0.72 [0.35; 1.48], 2 RCTs, I2=0% inconclusive result
 | - |  | 
| recombinant super-compound interferon rSIFN-co | 1 | 0.52 [0.02; 15.78], 1 RCT, I2=0% inconclusive result
 | 1.76 [1.10; 2.81], 1 RCT, I2=0% demonstrated unassessable degree of certainty
 | 1.04 [0.02; 53.73], 1 RCT, I2=0% inconclusive result
 | 7.68 [0.91; 65.15], 1 RCT, I2=0% inconclusive result
 |  |