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)
| 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 |
%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)