diff --git a/src/turnbull.rs b/src/turnbull.rs
index 6874a79..fa06274 100644
--- a/src/turnbull.rs
+++ b/src/turnbull.rs
@@ -723,12 +723,12 @@ fn survival_prob_likelihood_ratio_ci(data: &TurnbullData, progress_bar: Progress
 	// Compute upper confidence limit
 	
 	root_finder = AndersonBjorckRootFinder::new(
-		0.0, s[time_index],
-		f64::NAN, -CHI2_1DF_95  // Value of (lr_statistic - CHI2_1DF_95), which we are seeking the roots of
+		s[time_index], 1.0,
+		-CHI2_1DF_95, f64::NAN  // Value of (lr_statistic - CHI2_1DF_95), which we are seeking the roots of
 	);
 	
-	ci_estimate = s[time_index] - Z_97_5 * oim_se[time_index - 1];
-	if ci_estimate < 0.0 {
+	ci_estimate = s[time_index] + Z_97_5 * oim_se[time_index - 1];
+	if ci_estimate > 1.0 {
 		ci_estimate = root_finder.next_guess();  // Returns interval midpoint in this case
 	}
 	
@@ -744,8 +744,6 @@ fn survival_prob_likelihood_ratio_ci(data: &TurnbullData, progress_bar: Progress
 				value_left, value_right  // Value of (lr_statistic - CHI2_1DF_95), which we are seeking the roots of
 			);
 			
-			// TODO: Terminate if reached precision already
-			
 			ci_estimate = root_finder.next_guess();  // Returns interval midpoint in this case
 		}
 	}