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Table 2 Health status baseline and change scores

From: Assessing health status over time: impact of recall period and anchor question on the minimal clinically important difference of copd health status tools

 

N

CAT

CAT Standardized

CCQ Total

CCQ Total Standardized

SGRQ Total

 

Change at discharge (T1)

451

− 3.1*

(− 3.6 to − 2.6)

− 7.8*

(− 9.1 to − 6.5)

−0.6*

(− 0.7 to − 0.5)

− 9.7*

(− 11.2 to − 8.3)

− 9.0*

(− 10.2 to − 7.9)

 

Change after 3 months (T2)

355

− 1.4*

(− 2.2 to − 0.7)

−3.6*

(− 5.4 to − 1.8)

− 0.3*

(− 0.4 to − 0.2)

− 4.3*

(− 6.2 to − 2.5)

− 5.4*

(− 6.9 to − 3.8)

 

Change after 6 months (T3)

319

−0.9*

(− 1.7 to − 0.1)

−2.3*

(− 4.2 to − 0.4)

− 0.1

(− 0.2 to zero)

−1.8

(− 3.8 to + 0.2)

− 4.9*

(− 6.5 to − 3.2)

 

Change after 9 months (T4)

304

−1.1*

(− 1.9 to − 0.4)

−2.9*

(− 4.8 to − 0.9)

− 0.2*

(− 0.4 to − 0.1)

− 3.8*

(− 5.8 to − 1.8)

− 5.2*

(− 6.9 to − 3.4)

 

Change after 12 months (T5)

309

−0.9*

(− 1.7 to − 0.1)

− 2.2*

(− 4.2 to − 0.3)

− 0.2*

(− 0.3 to − 0.1)

− 2.7*

(− 4.7 to − 0.7)

−3.9*

(− 5.7 to − 2.2)

 
  1. Change scores reported as mean (95%CI). Change scores were calculated in comparison to baseline. Negative values represent improvement for CAT, CCQ and SGRQ. CAT and CCQ were standardized into a scale from zero to 100 to be comparable with SGRQ
  2. 95% CI 95% Confidence Interval, CAT COPD Assessment Test, CCQ Clinical COPD Questionnaire, N Number of patients, SGRQ St. George’s Respiratory Questionnaire, T1 Measurement at discharge, T2 3 months follow-up, T3 6 months follow-up, T4 9 months follow-up, T5 12 months follow-up
  3. *Significance of change scores p < 0.05 at T1/T2/T3/T4/T5 compared to baseline (T0)