EXACT scores exhibited internal consistency ( Cronbach 's @ ) , reproducibility ( intraclass correlation @ ) , correlation with St. George 's Respiratory Questionnaire ( Spearman rho -LSB- rs -RSB- = @ , @ , @ in the three trials ; P < @ ) , and Breathlessness Cough and Sputum Scale ( AZ @ , rs = @ ; AZ @ , rs = @ ; P < @ ) .