Table 4. Effect of NRA on favorable treatment response.

Cohort, n included in model	NRA n (%)	Conventional DST n (%)	Unadjusted OR (95%CI)	Adjusted OR (95%CI)*
Entire cohort (n = 1354)	461 (62.6)	363 (58.8)	1.17 (0.94–1.46)	1.13 (0.91–1.41)
Drug-resistant cohort (n = 474)	136 (50.6)	94 (45.9)	1.27 (0.84–1.74)	1.19 (0.83–1.72)
No prior treatment (n = 627)	186 (56.5)	142 (47.7)	1.43 (1.04–1.96)	1.39 (1.01–1.90)

^*Controlling for differences in age and suspected Category I or II failures.

NRA = nitrate reductase assay; DST = drug susceptibility testing; OR = odds ratio; CI = confidence interval.