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Table 3 Kaplan-meier analysis of time to first moderate/severe exacerbation and to premature withdrawal of patients from the study (ITT Population)

From: Fluticasone propionate/salmeterol 250/50 μg versus salmeterol 50 μg after chronic obstructive pulmonary disease exacerbation

 

FP/SAL 250/50 μg

SAL 50 μg

Hazard Ratio (FP/SAL:SAL)

(N = 314)

(N = 325)

(95% CI)

Cumulative no. (%) patients with moderate/severe exacerbation

102 (32)

115 (35)

 

% probability (95% CI) of moderate/severe exacerbation

45.2 (36.8, 54.5)

47.1 (40.6, 54.2)

0.83 (0.63, 1.09)

Cumulative no. (%) patients withdrawing from the study

98 (31)

119 (37)

 

% probability (95% CI) of withdrawal from the study

31.7 (26.7, 37.3)

37.1 (32.0, 42.7)

0.87 (0.67, 1.13)

  1. Hazard ratio and CI are from a Cox proportional hazards model with terms for treatment, country, randomization stratum and baseline severity. CI = confidence interval; FP = fluticasone propionate; ITT = intent-to-treat; SAL = salmeterol.