Participant baseline HCV viral load was recorded from the eCRF and categorized as either "Low" (<800,000 IU/mL or <2,000,000 RNA copies/mL) or "High" (≥800,000 IU/mL or ≥2,000,000 RNA copies/mL).

The Child-Pugh Score is used to determine the prognosis of chronic liver disease, in particular cirrhosis. It is classified into Classes A (best prognosis) to C (worst prognosis). Child-Pugh scores assessed within 3 months before CHC treatment regimen initiation were recorded from the eCRF, and the number of participants who were Grade A, Grade B, Grade C, not assessed, or unknown whether assessed were reported.

Anemia (hemoglobin <10 g/dL) was considered a Health Outcome of Interest (HOI) for this study. Clinical interventions used to manage episodes of anemia in participants could include erythropoiesis stimulating agent (ESA), blood transfusion, drug dose reduction, other treatment, and CHC treatment regimen modifications (drug dose reduction, drug discontinuation, and drug interruption). For this analysis, participants were categorized by CHC treatment group of exposure, and could successively be assigned to different treatment groups of exposure depending on their treatment regimen (treatment groups were not mutually exclusive). The percentage of anemia episodes that were managed by at least one intervention is reported for each CHC treatment exposure group with 95% confidence intervals.

Clinical interventions used to manage episodes of anemia in participants could include erythropoiesis stimulating agent (ESA), blood transfusion (BT), other treatment (OT), and CHC treatment regimen modifications including drug dose reduction (DDR), drug discontinuation (DD), and drug interruption (DI). Interventions could be used in combination (e.g. ESA plus blood transfusion) and more than one treatment modification could have been performed. For this analysis, participants were categorized by CHC treatment group of exposure, and could successively be assigned to different treatment groups of exposure depending on their treatment regimen (treatment groups were not mutually exclusive).

For each CHC treatment exposure group, the percentage of anemia episodes managed by a particular intervention are reported out of the total number of managed anemia episodes with data available for that intervention (i.e. anemia episodes with missing data for an intervention were excluded).

Grade 3/4 neutropenia (Grade 3: neutrophil count 0.5 - <0.75 × 10^9/L, Grade 4: <0.5 × 10^9/L) was considered a HOI for this study. Clinical interventions used to manage episodes of grade 3/4 neutropenia in participants could include Granulocyte colony-stimulating factor (G-CSF) use and CHC treatment regimen modifications (drug dose reduction, drug discontinuation, and drug interruption). For this analysis, participants were categorized by CHC treatment group of exposure, and could successively be assigned to different treatment groups of exposure depending on their treatment regimen (treatment groups were not mutually exclusive). The percentage of grade 3/4 neutropenia episodes that were managed by at least one intervention is reported for each CHC treatment exposure group with 95% confidence intervals.

Clinical interventions used to manage episodes of grade 3/4 neutropenia in participants could include Granulocyte colony-stimulating factor (G-CSF) use, other treatment (OT), and CHC treatment regimen modifications including drug dose reduction (DDR), drug discontinuation (DD), and drug interruption (DI). More than one treatment modification could have been performed. For this analysis, participants were categorized by CHC treatment group of exposure, and could successively be assigned to different treatment groups of exposure depending on their treatment regimen (treatment groups were not mutually exclusive).

For each CHC treatment exposure group, the percentage of grade 3/4 neutropenia episodes managed by a particular intervention are reported out of the total number of managed grade 3/4 neutropenia episodes with data available for that intervention (i.e. grade 3/4 neutropenia episodes with missing data for an intervention were excluded).

Grade 3/4 thrombocytopenia (Grade 3: platelet count 25 - <50 × 10^9/L, Grade 4: <25 × 10^9/L) was considered a HOI for this study. Clinical interventions used to manage episodes of grade 3/4 thrombocytopenia in participants could include thrombopoietin, platelet transfusion, other treatment, and CHC treatment regimen modifications (drug dose reduction, drug discontinuation, and drug interruption). For this analysis, participants were categorized by CHC treatment group of exposure, and could successively be assigned to different treatment groups of exposure depending on their treatment regimen (treatment groups were not mutually exclusive). The percentage of grade 3/4 thrombocytopenia episodes that were managed by at least one intervention is reported for each CHC treatment exposure group with 95% confidence intervals.

Clinical interventions used to manage episodes of grade 3/4 thrombocytopenia in participants could include thrombopoietin (TPO), platelet transfusion (PT), other treatment (OT) , and CHC treatment regimen modifications including drug dose reduction (DDR), drug discontinuation (DD), and drug interruption (DI). For this analysis, participants were categorized by CHC treatment group of exposure, and could successively be assigned to different treatment groups of exposure depending on their treatment regimen (treatment groups were not mutually exclusive).

For each CHC treatment exposure group, the percentage of grade 3/4 thrombocytopenia episodes managed by a particular intervention are reported out of the total number of managed grade 3/4 thrombocytopenia episodes with data available for that intervention (i.e. grade 3/4 thrombocytopenia episodes with missing data for an intervention were excluded).

Serious rash was considered a HOI for this study and included rash > 50% of body surface area, rash associated with significant systemic symptoms, or rash resulting in hospitalization or urgent care visit. Clinical interventions used to manage episodes of serious rash in participants could include topical corticosteroid use, intravenous (IV) and/or oral corticosteroids, emollients/moisturizers, antihistamines, other treatment, and CHC treatment regimen modifications (drug dose reduction, drug discontinuation, and drug interruption). For this analysis, participants were categorized by CHC treatment group of exposure, and could successively be assigned to different treatment groups of exposure depending on their treatment regimen (treatment groups were not mutually exclusive). The percentage of serious rash episodes that were managed by at least one intervention is reported for each CHC treatment exposure group with 95% confidence intervals.

Clinical interventions used to manage episodes of serious rash in participants could include topical corticosteroid (TC), intravenous (IV) and/or oral (PO) corticosteroids (IV/PO CS), emollients/moisturizers (E/M), antihistamines (AH), other treatment (OT), and CHC treatment regimen modifications including drug dose reduction (DDR), drug discontinuation (DD), and drug interruption (DI). For this analysis, participants were categorized by CHC treatment group of exposure, and could successively be assigned to different treatment groups of exposure depending on their treatment regimen (treatment groups were not mutually exclusive).

For each CHC treatment exposure group, the percentage of serious rash episodes managed by a particular intervention are reported out of the total number of managed serious rash episodes with data available for that intervention (i.e. serious rash episodes with missing data for an intervention were excluded).

CHC genotype-1 participants included in study and prescribed PR alone as routine clinical management

Total of all reporting groups

Baseline mean weight (standard deviation [SD]) in kilograms (Kg) was recorded from the eCRF.

Participants in the Analysis Population (all CHC genotype-1 participants included in study meeting eligibility criteria and receiving boceprevir plus peginterferon and ribavirin (PR), telaprevir plus PR, or PR alone) with available demographic data (weight).

Baseline mean height (SD) in centimeters (cm) was recorded from the eCRF.

Participants in the Analysis Population (all CHC genotype-1 participants included in study meeting eligibility criteria and receiving boceprevir plus peginterferon and ribavirin (PR), telaprevir plus PR, or PR alone) with available demographic data (height).

Baseline mean body mass index (SD) in Kg/m^2 was recorded from the eCRF.

Participants in the Analysis Population (all CHC genotype-1 participants included in study meeting eligibility criteria and receiving boceprevir plus peginterferon and ribavirin (PR), telaprevir plus PR, or PR alone) with available demographic data (BMI).

Baseline HCV genotype was recorded from the eCRF and the number of participants who were 1a genotype, 1b genotype, or unknown/other was reported.

Participants in the Analysis Population (all CHC genotype-1 participants included in study meeting eligibility criteria and receiving boceprevir plus peginterferon and ribavirin (PR), telaprevir plus PR, or PR alone) with available demographic data (HCV genotype).

Participant baseline HCV viral load was recorded from the eCRF and categorized as either "Low" (<800,000 IU/mL or <2,000,000 RNA copies/mL) or "High" (≥800,000 IU/mL or ≥2,000,000 RNA copies/mL).

Participants in the Analysis Population (all CHC genotype-1 participants included in study meeting eligibility criteria and receiving boceprevir plus peginterferon and ribavirin (PR), telaprevir plus PR, or PR alone) with available demographic data (viral load).

The Child-Pugh Score is used to determine the prognosis of chronic liver disease, in particular cirrhosis. It is classified into Classes A (best prognosis) to C (worst prognosis). Child-Pugh scores assessed within 3 months before CHC treatment regimen initiation were recorded from the eCRF, and the number of participants who were Grade A, Grade B, Grade C, not assessed, or unknown whether assessed were reported.

Participants in the Analysis Population (all CHC genotype-1 participants included in study meeting eligibility criteria and receiving boceprevir plus peginterferon and ribavirin (PR), telaprevir plus PR, or PR alone) with available demographic data (Child Pugh score).

Anemia (hemoglobin <10 g/dL) was considered a Health Outcome of Interest (HOI) for this study. Clinical interventions used to manage episodes of anemia in participants could include erythropoiesis stimulating agent (ESA), blood transfusion, drug dose reduction, other treatment, and CHC treatment regimen modifications (drug dose reduction, drug discontinuation, and drug interruption). For this analysis, participants were categorized by CHC treatment group of exposure, and could successively be assigned to different treatment groups of exposure depending on their treatment regimen (treatment groups were not mutually exclusive). The percentage of anemia episodes that were managed by at least one intervention is reported for each CHC treatment exposure group with 95% confidence intervals.

Participants in the Analysis Population (all CHC genotype-1 participants included on study meeting eligibility criteria and treated with boceprevir plus PR, telaprevir plus PR, or PR alone) who experienced at least one episode of anemia. Participants categorized by treatment group of exposure (further described in Arm Description).

Clinical interventions used to manage episodes of anemia in participants could include erythropoiesis stimulating agent (ESA), blood transfusion (BT), other treatment (OT), and CHC treatment regimen modifications including drug dose reduction (DDR), drug discontinuation (DD), and drug interruption (DI). Interventions could be used in combination (e.g. ESA plus blood transfusion) and more than one treatment modification could have been performed. For this analysis, participants were categorized by CHC treatment group of exposure, and could successively be assigned to different treatment groups of exposure depending on their treatment regimen (treatment groups were not mutually exclusive).

For each CHC treatment exposure group, the percentage of anemia episodes managed by a particular intervention are reported out of the total number of managed anemia episodes with data available for that intervention (i.e. anemia episodes with missing data for an intervention were excluded).

Participants in the Analysis Population (all CHC genotype-1 participants included on study meeting eligibility criteria and treated with boceprevir plus PR, telaprevir plus PR, or PR alone) who experienced at least one episode of anemia. Participants categorized by treatment group of exposure (further described in Arm Description).

Grade 3/4 neutropenia (Grade 3: neutrophil count 0.5 - <0.75 × 10^9/L, Grade 4: <0.5 × 10^9/L) was considered a HOI for this study. Clinical interventions used to manage episodes of grade 3/4 neutropenia in participants could include Granulocyte colony-stimulating factor (G-CSF) use and CHC treatment regimen modifications (drug dose reduction, drug discontinuation, and drug interruption). For this analysis, participants were categorized by CHC treatment group of exposure, and could successively be assigned to different treatment groups of exposure depending on their treatment regimen (treatment groups were not mutually exclusive). The percentage of grade 3/4 neutropenia episodes that were managed by at least one intervention is reported for each CHC treatment exposure group with 95% confidence intervals.

Participants in the Analysis Population (all CHC genotype-1 participants included on study meeting eligibility criteria and treated with boceprevir plus PR, telaprevir plus PR, or PR alone) who experienced at least one episode of grade 3/4 neutropenia. Participants categorized by treatment group of exposure (further described in Arm Description).

Clinical interventions used to manage episodes of grade 3/4 neutropenia in participants could include Granulocyte colony-stimulating factor (G-CSF) use, other treatment (OT), and CHC treatment regimen modifications including drug dose reduction (DDR), drug discontinuation (DD), and drug interruption (DI). More than one treatment modification could have been performed. For this analysis, participants were categorized by CHC treatment group of exposure, and could successively be assigned to different treatment groups of exposure depending on their treatment regimen (treatment groups were not mutually exclusive).

For each CHC treatment exposure group, the percentage of grade 3/4 neutropenia episodes managed by a particular intervention are reported out of the total number of managed grade 3/4 neutropenia episodes with data available for that intervention (i.e. grade 3/4 neutropenia episodes with missing data for an intervention were excluded).

Participants in the Analysis Population (all CHC genotype-1 participants included on study meeting eligibility criteria and treated with boceprevir plus PR, telaprevir plus PR, or PR alone) who experienced at least one episode of grade 3/4 neutropenia. Participants categorized by treatment group of exposure (further described in Arm Description).

Grade 3/4 thrombocytopenia (Grade 3: platelet count 25 - <50 × 10^9/L, Grade 4: <25 × 10^9/L) was considered a HOI for this study. Clinical interventions used to manage episodes of grade 3/4 thrombocytopenia in participants could include thrombopoietin, platelet transfusion, other treatment, and CHC treatment regimen modifications (drug dose reduction, drug discontinuation, and drug interruption). For this analysis, participants were categorized by CHC treatment group of exposure, and could successively be assigned to different treatment groups of exposure depending on their treatment regimen (treatment groups were not mutually exclusive). The percentage of grade 3/4 thrombocytopenia episodes that were managed by at least one intervention is reported for each CHC treatment exposure group with 95% confidence intervals.

Participants in Analysis Population (all CHC genotype-1 participants included on study meeting eligibility criteria and treated with boceprevir plus PR, telaprevir plus PR, or PR alone) who experienced at least one episode of grade 3/4 thrombocytopenia. Participants categorized by treatment group of exposure (further described in Arm Description).

Clinical interventions used to manage episodes of grade 3/4 thrombocytopenia in participants could include thrombopoietin (TPO), platelet transfusion (PT), other treatment (OT) , and CHC treatment regimen modifications including drug dose reduction (DDR), drug discontinuation (DD), and drug interruption (DI). For this analysis, participants were categorized by CHC treatment group of exposure, and could successively be assigned to different treatment groups of exposure depending on their treatment regimen (treatment groups were not mutually exclusive).

For each CHC treatment exposure group, the percentage of grade 3/4 thrombocytopenia episodes managed by a particular intervention are reported out of the total number of managed grade 3/4 thrombocytopenia episodes with data available for that intervention (i.e. grade 3/4 thrombocytopenia episodes with missing data for an intervention were excluded).

Participants in Analysis Population (all CHC genotype-1 participants included on study meeting eligibility criteria and treated with boceprevir plus PR, telaprevir plus PR, or PR alone) who experienced at least one episode of grade 3/4 thrombocytopenia. Participants categorized by treatment group of exposure (further described in Arm Description).

Serious rash was considered a HOI for this study and included rash > 50% of body surface area, rash associated with significant systemic symptoms, or rash resulting in hospitalization or urgent care visit. Clinical interventions used to manage episodes of serious rash in participants could include topical corticosteroid use, intravenous (IV) and/or oral corticosteroids, emollients/moisturizers, antihistamines, other treatment, and CHC treatment regimen modifications (drug dose reduction, drug discontinuation, and drug interruption). For this analysis, participants were categorized by CHC treatment group of exposure, and could successively be assigned to different treatment groups of exposure depending on their treatment regimen (treatment groups were not mutually exclusive). The percentage of serious rash episodes that were managed by at least one intervention is reported for each CHC treatment exposure group with 95% confidence intervals.

Participants in the Analysis Population (all CHC genotype-1 participants included on study meeting eligibility criteria and treated with boceprevir plus PR, telaprevir plus PR, or PR alone) who experienced at least one episode of serious rash. Participants categorized by treatment group of exposure (further described in Arm Description).

Clinical interventions used to manage episodes of serious rash in participants could include topical corticosteroid (TC), intravenous (IV) and/or oral (PO) corticosteroids (IV/PO CS), emollients/moisturizers (E/M), antihistamines (AH), other treatment (OT), and CHC treatment regimen modifications including drug dose reduction (DDR), drug discontinuation (DD), and drug interruption (DI). For this analysis, participants were categorized by CHC treatment group of exposure, and could successively be assigned to different treatment groups of exposure depending on their treatment regimen (treatment groups were not mutually exclusive).

For each CHC treatment exposure group, the percentage of serious rash episodes managed by a particular intervention are reported out of the total number of managed serious rash episodes with data available for that intervention (i.e. serious rash episodes with missing data for an intervention were excluded).

Participants in the Analysis Population (all CHC genotype-1 participants included on study meeting eligibility criteria and treated with boceprevir plus PR, telaprevir plus PR, or PR alone) who experienced at least one episode of serious rash. Participants categorized by treatment group of exposure (further described in Arm Description).

The incidence (events per 1000 participant-days) of the protocol-defined HOIs (anemia, grade 3/4 neutropenia, grade 3/4 thrombocytopenia, and serious skin rash) was calculated over the 48-week period following the start of CHC treatment exposure. All protocol-defined HOIs were taken into account (serious and non-serious HOIs). For this analysis, participants were categorized by CHC treatment group of exposure, and could successively be assigned to different treatment groups of exposure depending on their treatment regimen (treatment groups were not mutually exclusive). The incidence per 1000 participant-days of anemia, grade 3/4 neutropenia, grade 3/4 thrombocytopenia, and serious skin rash were reported by CHC treatment group of exposure with 95% confidence intervals.

Participants in Analysis Population (CHC genotype-1 participants meeting eligibility criteria and treated with boceprevir+PR, telaprevir+PR, or PR alone) with available data who did not already experience HOI during 3 months preceding CHC treatment regimen. Participants categorized by treatment group of exposure further described in Arm Description

CHC genotype-1 participants included in study and prescribed telaprevir plus PR as routine clinical management.

CHC genotype-1 participants included in study and prescribed PR alone as routine clinical management