Table 4

Longitudinal construct validity: Pearson’s correlation coefficients

  • SGRQ = St George’s Respiratory Questionnaire; CRQ = Chronic Respiratory Diseases Questionnaire; FEV1 = forced expiratory volume in one second; PEFR = peak expiratory flow rate.

  • 4-150 p <0.05;

  • 4-160 p <0.01.