Table 2 Pearson correlation coefficients (r) comparing different versions of the ACQ, the ACQ item for puffs and lung function measurements at week 2 (number of valid observations between 73 and 76)

From: Weekly self-measurement of FEV1 and PEF and its impact on ACQ (asthma control questionnaire)-scores: 12-week observational study with 76 patients

R for

ACQ6

ACQ7 (FEV1%P)

ACQ7 (PEF%P)

ACQ item puffs

FEV1 raw value

FEV1 %P

FEV1 %P coded ACQ

PEF raw value

PEF %P

PEF %P coded ACQ

ACQ5

0.99

0.96

0.96

0.48

−0.52

−0.46

0.49

−0.42

−0.43

0.45

ACQ6

 

0.97

0.97

0.57

−0.51

−0.43

046

−0.44

−0.41

0.44

ACQ7 (FEV1 %P)

  

0.97

0.58

−0.63

−0.81

0.67

−0.51

−0.54

0.54

ACQ (PEF %P)

   

0.56

−0.54

−0.51

0.56

−0.58

−0.61

0.64

ACQ item puffs

    

−0.27*

−0.31*

0.35*

−0.22#

−0.28*

0.27*

FEV1 % raw value

     

0.67

−0.71

0.69

0.45

−0.41

FEV %P

      

−0.91

0.42

0.60

−0.55

FEV1 %P coded ACQ

       

−0.50

−0.69

0.64

PEF raw value

        

0.81

−0.75

PEF %P

         

−0.93

  1. %P = % predicted, correlations are statistically significant at the p < 0.001 except * which are significant at p < 0.05 but ≥ 0.001 and # which are not significant (p ≥ 0.05)
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