Percentage of participants with plasma Human Immunodeficiency Virus-1 (HIV-1) Ribonucleic Acid (RNA) with <50 c/mL was assessed using the Missing, Switch or Discontinuation = Failure (MSDF), as codified by the Food and Drug Administration (FDA) snapshot algorithm. The algorithm treats all participants without HIV-1 RNA data as non-responders, as well as participants who switch their concomitant Antiretroviral Therapy (ART) prior to Week 48 as follows: background ART substitutions not permitted per study; background ART substitutions permitted per study unless the decision to switch was documented as being before or at the first on-treatment visit where HIV-1 RNA was assessed. Otherwise, virologic success or failure will be determined by the last available HIV-1 RNA assessment while the subject was on-treatment. Intent-to-Treat Exposed (ITT-E) Population comprised all randomized participants who received at least one dose of study medication.

ITT-E Population.

Number of participants with detectable virus that has genotypic or phenotypic evidence of Integrase Inhibitor (INI) resistance were assessed at Week 48 and Week 96. Integrase inhibitors are a class of antiretroviral drug designed to block the action of integrase, a viral enzyme that inserts the viral genome into the deoxyribonucleic acid (DNA) of the host cell.

ITT-E Population

The number of participants with plasma HIV-1 RNA level <50 c/mL was assessed at Week 96.

ITT-E Population

The number of participants with plasma HIV-1 RNA level <400 c/mL was assessed at Week 48 and Week 96.

ITT-E Population

Change from Baseline in plasma HIV-1 RNA over time was assessed at Baseline and Weeks 4, 8, 12, 16, 24, 32, 40, 48, 60, 72, 84, 96. Baseline was defined as the measurements performed on Day 1. Change from Baseline was calculated as the post-Baseline value minus the Baseline value. Only those participants with data available at the specified time points were analyzed (represented by n=x,x in the category titles).

ITT-E Population.

Absolute values in plasma HIV-1 RNA over time was assessed at Baseline and Weeks 4, 8, 12, 16, 24, 32, 40, 48, 60, 72, 84, 96. Only those participants with data available at the specified time points were analyzed (represented by n=x,x in the category titles).

ITT-E Population.

CD4 lymphocyte cells (also called T-cells or T-helper cells) are the primary targets of HIV. The CD4 count and the CD4 percentage mark the degree of immuno compromise. The CD4 count is used to stage the participants disease, determine the risk of opportunistic illnesses, assess prognosis, and guide decisions about when to start ART. Changes from Baseline in CD4+ cell counts over time was assessed at Baseline and Weeks 4, 8, 12, 16, 24, 32, 40, 48, 60, 72, 84, 96. Baseline was defined as measurements performed on Day 1. Change from Baseline was calculated as the post-Baseline value minus the Baseline value. Only those participants with data available at the specified time points were analyzed (represented by n=x,x in the category titles).

ITT-E Population.

CD4 lymphocyte cells (also called T-cells or T-helper cells) are the primary targets of HIV. The CD4 count and the CD4 percentage mark the degree of immuno compromise. The CD4 count is used to stage the patient's disease, determine the risk of opportunistic illnesses, assess prognosis, and guide decisions about when to start antiretroviral therapy absolute values in CD4+ cell counts over time was assessed at Baseline and Weeks 4, 8, 12, 16, 24, 32, 40, 48, 60, 72, 84, 96. Only those participants with data available at the specified time points were analyzed (represented by n=x,x in the category titles).

ITT-E Population.

Clinical disease progression (CDP) was assessed according to the Centers for Disease Control and Prevention (CDC) HIV-1 classification system. Category (CAT) A: one or more of the following conditions (CON), without any CON listed in Categories B and C: asymptomatic HIV infection, persistent generalized lymphadenopathy, acute (primary) HIV infection with accompanying illness or history of acute HIV infection. CAT B: symptomatic CON that are attributed to HIV infection or are indicative of a defect in cell-mediated immunity; or that are considered by physicians to have a clinical course or to require management that is complicated by HIV infection; and not included among CON listed in clinical CAT C. CAT C: the clinical CON listed in the AIDS surveillance case definition. Indicators of CDP were defined as: CDC CAT A at Baseline to a CDC CAT C event (EV); CDC CAT B at Baseline to a CDC CAT C EV; CDC CAT C at Baseline to a new CDC CAT C EV; or CDC CAT A, B, or C at Baseline to death.

ITT-E Population

All Grade 1 to 4 post-Baseline-emergent chemistry toxicities included alanine aminotransferase (ALT), alkaline phosphatase (ALP), asparate aminotransferase (AST), carbon dioxide (CO2) content/bicarbonate, cholesterol, creatine kinase (CK), creatinine, hyperglycemia, hyperkalemia, hypernatremia, hypoglycemia, hypokalemia, hyponatremia, low density lipoprotein (LDL) cholesterol calculation, lipase, phosphorus inorganic, total bilirubin, and triglycerides. All Grade 1 to 4 post-Baseline-emergent hematology toxities included hemoglobin, platelet count, total neutrophils, and white blood cell count. The Division of AIDS (DAIDS) defined toxicity grades as follows: Grade 1, mild; Grade 2, moderate; Grade 3, severe; Grade 4, potentially life threatening; Grade 5, death. Safety Population: all participants who received at least one dose of investigational product

Safety Population.

AUC is defined as the area under the DTG concentration-time curve as a measure of drug exposure over time. AUC(0-tau) is defined as the area under the plasma concentration-time curve from time zero to time tau over a dosing interval at steady state, where tau is the length of the dosing interval of DTG. The predicted individual AUC(0-tau) were obtained from the final population PK model by an empirical Bayes estimation. Blood samples for PK assessments were collected at pre-dose (within 15 minutes prior to dose) at Week 4, Week 24, and Week 48 and 1 to 3 hours post-dose or 4 to 12 hours post-dose at Week 4 and Week 24. If 1 to 3 hours post-dose was completed at Week 4, then the 4 to12 hour post-dose must be obtained at Week 48, and vice versa. The Pharmacokinetic (PK) Concentration Population comprised of all participants who received DTG, had undergone PK sampling during the study, and provided evaluable DTG plasma concentration data.

PK Concentration Population

The maximum plasma concentration (Cmax) and concentration at the end of a dosing interval (Ctau) of DTG were assessed at Week 48. The predicted individual Cmax and Ctau were obtained from the final population PK model by simulation of the concentration-time profiles. Blood samples for PK assessments were collected at pre-dose (within 15 minutes prior to dose) at Week 4, Week 24, and Week 48 and 1 to 3 hours post-dose or 4 to 12 hours post-dose at Week 4 and Week 24. If 1 to 3 hour post-dose was completed at Week 4, then the 4 to12 hour post-dose must be obtained at Week 48, and vice versa.

PK Concentration Population.