Table 2.

Marginal Structural Cox Model Estimates for the Effect of Treatment Regimen on Postindex Virologic Failure (n = 532)

ExposurePerson-YearsNumber of Virologic FailureCrude HR (95% CI)IPTW×IPCW-Weighted Marginal Structural Model HR (95% CI)
Exposure to PI/r with 2 NRTIs723.56231 (reference)1 (reference)
Exposure to dolutegravir with 2 NRTIs291.5450.54 (0.23–1.24)0.57 (0.21–1.52)
ExposurePerson-YearsNumber of Virologic FailureCrude HR (95% CI)IPTW×IPCW-Weighted Marginal Structural Model HR (95% CI)
Exposure to PI/r with 2 NRTIs723.56231 (reference)1 (reference)
Exposure to dolutegravir with 2 NRTIs291.5450.54 (0.23–1.24)0.57 (0.21–1.52)

Abbreviations: CI, confidence interval; HR, hazard ratio; IPCW, inverse probability of censoring weights; IPTW, inverse probability of treatment weights; NRTIs, nucleoside reverse-transcriptase inhibitors; PI/r, protease inhibitor/ritonavir.

Table 2.

Marginal Structural Cox Model Estimates for the Effect of Treatment Regimen on Postindex Virologic Failure (n = 532)

ExposurePerson-YearsNumber of Virologic FailureCrude HR (95% CI)IPTW×IPCW-Weighted Marginal Structural Model HR (95% CI)
Exposure to PI/r with 2 NRTIs723.56231 (reference)1 (reference)
Exposure to dolutegravir with 2 NRTIs291.5450.54 (0.23–1.24)0.57 (0.21–1.52)
ExposurePerson-YearsNumber of Virologic FailureCrude HR (95% CI)IPTW×IPCW-Weighted Marginal Structural Model HR (95% CI)
Exposure to PI/r with 2 NRTIs723.56231 (reference)1 (reference)
Exposure to dolutegravir with 2 NRTIs291.5450.54 (0.23–1.24)0.57 (0.21–1.52)

Abbreviations: CI, confidence interval; HR, hazard ratio; IPCW, inverse probability of censoring weights; IPTW, inverse probability of treatment weights; NRTIs, nucleoside reverse-transcriptase inhibitors; PI/r, protease inhibitor/ritonavir.

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