A Study to Evaluate the Safety and Efficacy of Ombitasvir/Paritaprevir/Ritonavir and Dasabuvir With Ribavirin in Adults With Genotype 1 and Ombitasvir/Paritaprevir/Ritonavir With Ribavirin in Adults With Genotype 4 Chronic Hepatitis C Virus Infection and Decompensated Cirrhosis

SVR12, defined as HCV RNA \< lower limit of quantification (LLOQ) in the SVR12 window (12 weeks after the last actual dose of study drug) without any confirmed quantifiable (≥ LLOQ) post-treatment value before or during that SVR window. Flanking imputation: for participants with missing HCV RNA at a visit who have an undetectable HCV RNA or unquantifiable HCV RNA at the preceding visit and the succeeding visit, the missing value was imputed as undetectable or unquantifiable. For SVR analyses, if there was no value in the window after the flanking imputation but there was an HCV RNA value after the window, then it was imputed into the SVR window. After above imputations were applied, if there was still no value in the window but there was an HCV RNA value from a local laboratory present, then it was imputed into the SVR window. Otherwise, participants with missing data were counted as failures. The 95% confidence interval was calculated using the Wilson score method.

Time frame: 12 weeks after the last actual dose of study drug

Population: Intent to treat population: all participants who received at least 1 dose of study drug; participants missing data = non-responders. See imputation details in the outcome measure description.

The The Child-Pugh score uses five clinical measures of liver disease (3 laboratory parameters and 2 clinical assessments) to measure severity of cirrhosis. Scores range from 5 to 15, with higher scores indicating more severity. Improvement was defined as a decrease of 1 or more from baseline to post-treatment Week 12.

Time frame: Up to post-treatment Week 12

Population: Intent to treat population: all participants who received at least 1 dose of study drug with values at both baseline and post-treatment Week 12.

The FibroTest score is used to assess liver fibrosis. Scores range from 0.00 to 1.00, with higher scores indicating a greater degree of fibrosis. Improvement was defined as a decrease of more than 0.2 from baseline to post-treatment Week 12.

Time frame: Up to post-treatment Week 12

Population: Intent to treat population: all participants who received at least 1 dose of study drug with values at both baseline and post-treatment Week 12.

Improvement was defined as: * increase of more than 0.2 g/L from baseline to post-treatment Week 12 in albumin * decrease of more than 0.3 µmol/L from baseline to post-treatment Week 12 in bilirubin * decrease of more than 5 ng/mL from baseline to post-treatment Week 12 in alpha-fetoprotein * increase of more than 15\*10\^9/L from baseline to post-treatment Week 12 in platelet count * decrease of more than 0.2 from baseline to post-treatment Week 12 in international normalized ratio.

Time frame: Up to post-treatment Week 12

Population: Intent to treat population: all participants who received at least 1 dose of study drug with values at both baseline and post-treatment Week 12 for the respective parameter.

MELD is a scoring system for assessing the severity of chronic liver disease. Scores range from 6 to 40, with higher scores indicating more severity. Improvement was defined as a decrease of 1 or more from baseline to post-treatment Week 12.

Time frame: Up to post-treatment Week 12

Population: Intent to treat population: all participants who received at least 1 dose of study drug with values at both baseline and post-treatment Week 12.

SVR12, defined as HCV RNA \< LLOQ in the SVR12 window (12 weeks after the last actual dose of study drug) without any confirmed quantifiable (≥ LLOQ) post-treatment value before or during that SVR window. Flanking imputation: for participants with missing HCV RNA at a visit, who have an undetectable HCV RNA or unquantifiable HCV RNA at the preceding visit and the succeeding visit, the missing value was imputed as undetectable or unquantifiable. For SVR analyses, if there was no value in the window after the flanking imputation but there was an HCV RNA value after the window, then it was imputed into the SVR window. After above imputations were applied, if there was still no value in the window but there was an HCV RNA value from a local laboratory present, then it was imputed into the SVR window. Otherwise, participants with missing data were counted as failures.

Time frame: 12 weeks after the last actual dose of study drug

Population: Intent to treat population: all participants who received at least 1 dose of study drug; participants missing data = non-responders. See imputation details in the outcome measure description.

On-treatment virologic failure was defined as: confirmed HCV RNA ≥ LLOQ after HCV RNA \< LLOQ during treatment; confirmed increase from nadir in HCV RNA (two consecutive HCV RNA measurements \> 1 log˅10 IU/mL above nadir) at any time point during treatment; or HCV RNA ≥ LLOQ persistently during treatment with at least 6 weeks (≥ 36 days) of treatment. The 95% confidence interval was calculated using Wilson score method. SVR12 was defined as HCV RNA \< LLOQ in the SVR12 window (12 weeks after the last actual dose of study drug) without any confirmed quantifiable (≥ LLOQ) post-treatment value before or during that SVR window.

Time frame: Up to 24 weeks during treatment

Population: Intent to treat population: all participants who received at least 1 dose of study drug.

Relapse˅12 was defined as confirmed HCV RNA ≥ LLOQ between end of treatment and 12 weeks after last actual dose of active study drug (up to and including the SVR12 window) for a participant with HCV RNA \< LLOQ at final treatment visit who completes treatment and has post-treatment HCV RNA data. Completion of treatment was defined as a study drug duration ≥ 77 days for participants assigned to 12 weeks of treatment or ≥ 154 days for participants assigned to 24 weeks of treatment. SVR12 was defined as HCV RNA \< LLOQ in the SVR12 window (12 weeks after the last actual dose of study drug) without any confirmed quantifiable (≥ LLOQ) post-treatment value before or during that SVR window. The 95% confidence interval was calculated using the Wilson score method.

Time frame: Up to 12 weeks after the last actual dose of study drug

Population: Intent to treat population: all participants who received at least 1 dose of study drug and who had an assessment.