Primary Outcomes

Description: Blood samples for determining virologic failure were obtained at visit weeks 16 and 24 , and every 12 weeks thereafter. Virologic failure was defined as a confirmed plasma HIV-1 RNA level >= 1000 copies/mL at or after 16 weeks after randomization and before 24 weeks, or >=200 copies/mL at or after 24 weeks. The 5th percentile for time to virologic failure is the time (in weeks) at which 5% of the participants have experienced virologic failure.

Measure: Time From Randomization to Virologic Failure

Time: Follow-up time was variable,median follow-up was 138 weeks; see 'Amount of study follow-up' outcome for details

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Description: Grade 3/4 safety event is defined as a grade 3 or 4 sign, symptom, or laboratory abnormality that is at least one grade higher than at baseline, total bilirubin and creatine kinase (CPK) were excluded. Grading used the Division of AIDS (DAIDS) 2004 Severity of Adverse Events Tables.

Measure: Time From Treatment Dispensation to a Grade 3/4 Safety Event

Time: All follow-up while on initially assigned regimen; the median (25th, 75th percentile) follow-up while on initial regimen was 120 (54, 156) weeks and the range was 0 to 205 weeks.

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Description: Treatment modification is defined as the 1st modification of the regimen, including a permanent discontinuation, switch, or substitution.

Measure: Time From Treatment Dispensation to Treatment Modification

Time: Follow-up time was variable,median follow-up was 138 weeks; see 'Amount of study follow-up' outcome for details

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Secondary Outcomes

Description: Blood samples for determining virologic failure were obtained at 16 and 24 weeks, and every 12 weeks thereafter. Virologic failure was defined as a confirmed plasma HIV-1 RNA level >= 1000 copies/mL at or after 16 weeks and before 24 weeks or >=200 copies/mL at or after 24 weeks. Treatment modification was defined as the 1st modification of the regimen, including a permanent discontinuation, switch, or substitution.

Measure: Time From Treatment Dispensation to Regimen Failure (First Occurrence of Virologic Failure or Treatment Modification)

Time: Follow-up time was variable,median follow-up was 138 weeks; see 'Amount of study follow-up' outcome for details

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Measure: The Number of Participants With HIV-1 RNA Levels Less Than 50 Copies/mL

Time: At Weeks 48 and 96

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Measure: Number of Participants With HIV-1 RNA Levels Less Than 200 Copies/mL

Time: At Weeks 48 and 96

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Description: Change was calculated as the CD4 count at Week 48 (or at Week 96) minus the baseline CD4 count (mean of pre-entry and entry values).

Measure: Change in CD4 Count (Cells/mm3) From Baseline

Time: At Weeks 48 and 96

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Description: Emergence of resistant virus was assessed by genotypic testing performed at Stanford University for all participants who met criteria for virologic failure and retrospectively on baseline samples from these participants. Major mutations were defined by International AIDS Society-United States of America (2008), as well as T69D, L74I, G190C/E/Q/T/V for reverse transcriptase and L24I, F53L, I54V/A/T/S, G73C/S/T/A, N88D for protease.

Measure: Number of Participants With Virologic Failure and Emergence of Major Resistance

Time: Follow-up time was variable,median follow-up was 138 weeks; see 'Amount of study follow-up' outcome for details

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Description: AIDS-defining illnesses were defined per CDC category C definition. HIV-1 related events were defined per CDC category B definition. Events underwent study chair review for classification. See link below for more details. http://www.cdc.gov/mmwr/preview/mmwrhtml/00018871.htm

Measure: Number of Participants Experiencing Certain Targeted Clinical Events, Including Death, AIDS-defining Illness, and HIV-1 Related Events.

Time: Follow-up time was variable, median follow-up was 138 weeks; see 'Amount of study follow-up' outcome for details

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Description: Only fasting results are included. The protocol did not require that samples be collected fasting.

Measure: Change in Fasting Total Cholesterol Level From Baseline

Time: At Weeks 48 and 96

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Description: Only fasting results are included. The protocol did not require that samples be collected fasting.

Measure: Change in Fasting High-density Lipoprotein (HDL) Cholesterol Level From Baseline

Time: At Weeks 48 and 96

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Description: Only fasting results are included. The protocol did not require that samples be collected fasting.

Measure: Change in Fasting Non-high Density Lipoprotein (Non-HDL) Cholesterol Level From Baseline

Time: At Weeks 48 and 96

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Description: Only fasting results are included. The protocol did not require that samples be collected fasting.

Measure: Change in Fasting Triglyceride Level From Baseline

Time: At Weeks 48 and 96

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Other Outcomes

Description: Participants were to be followed for 96 weeks after the last enrollment. Accrual was expected to take 96 weeks, thus the planned follow-up time was 96 to 192 weeks, dependent on when in the study the participant enrolled. This outcome summarizes that total amount of actual follow-up in weeks from randomization to last contact.

Measure: Amount of Study Follow-up

Time: Follow-up time was variable, median follow-up was 138 weeks

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Description: Blood samples for determining virologic failure were obtained at 16 and 24 weeks, and every 12 weeks thereafter. Virologic failure was defined as a confirmed plasma HIV-1 RNA level >= 1000 copies/mL at or after 16 weeks and before 24 weeks or >=200 copies/mL at or after 24 weeks.

Measure: Number of Participants With Virologic Failure

Time: Follow-up time was variable, median follow-up was 138 weeks; see 'Amount of study follow-up' outcome for details

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Description: Kaplan-Meier estimate of the cumulative survival probability at week 48 and 96. Blood samples for determining virologic failure were obtained at 16 and 24 weeks, and every 12 weeks thereafter. Virologic failure was defined as a confirmed plasma HIV-1 RNA level >= 1000 copies/mL at or after 16 weeks and before 24 weeks or >=200 copies/mL at or after 24 weeks.

Measure: Cumulative Probability of Not Experiencing Virologic Failure

Time: At week 48 and 96

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Description: Grade 3/4 safety event is defined as a grade 3 or 4 sign, symptom, or laboratory abnormality that is at least one grade higher than at baseline, total bilirubin and creatine kinase (CPK) were excluded. Grading used the Division of AIDS (DAIDS) 2004 Severity of Adverse Events Tables. As-treated analysis censored at 1st modification of initially assigned regimen, participants who never started treatment were excluded.

Measure: Number of Participants With a Grade 3/4 Safety Event

Time: Over all study follow-up while on initially assigned treatment, median follow-up was 120 weeks

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Description: Kaplan-Meier estimate of the cumulative survival probability at week 48 and 96. Grade 3/4 safety event is defined as a grade 3 or 4 sign, symptom, or laboratory abnormality that is at least one grade higher than at baseline, total bilirubin and creatine kinase (CPK) were excluded. Grading used the Division of AIDS (DAIDS) 2004 Severity of Adverse Events Tables. As-treated analysis censored at 1st modification of initially assigned regimen, participants who never started treatment were excluded.

Measure: Cumulative Probability of Not Experiencing a Grade 3/4 Safety Event

Time: At week 48 and 96

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Description: Treatment modification is defined as the 1st modification of the regimen, including a permanent discontinuation, switch, or substitution.

Measure: Number of Participants With Treatment Modification

Time: Follow-up time was variable, median follow-up was 138 weeks; see 'Amount of study follow-up' outcome for details

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Description: Kaplan-Meier estimate of the cumulative survival probability at week 48 and 96. Treatment modification is defined as the 1st modification of the regimen, including a permanent discontinuation, switch, or substitution.

Measure: Cumulative Probability of Not Experiencing Treatment Modification

Time: At week 48 and 96

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Description: Blood samples for determining virologic failure were obtained at 16 and 24 weeks, and every 12 weeks thereafter. Virologic failure was defined as a confirmed plasma HIV-1 RNA level >= 1000 copies/mL at or after 16 weeks and before 24 weeks or >=200 copies/mL at or after 24 weeks. Treatment modification was defined as the 1st modification of the regimen, including a permanent discontinuation, switch, or substitution.

Measure: Number of Participants With Regimen Failure

Time: Follow-up time was variable, median follow-up was 138 weeks; see 'Amount of study follow-up' outcome for details

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Description: Kaplan-Meier estimate of the cumulative survival probability at week 48 and 96. Blood samples for determining virologic failure were obtained at 16 and 24 weeks, and every 12 weeks thereafter. Virologic failure was defined as a confirmed plasma HIV-1 RNA level >= 1000 copies/mL at or after 16 weeks and before 24 weeks or >=200 copies/mL at or after 24 weeks. Treatment modification was defined as the 1st modification of the regimen, including a permanent discontinuation, switch, or substitution.

Measure: Cumulative Probability of Not Experiencing Regimen Failure

Time: At week 48 and 96

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