EXACT scores exhibited internal consistency ( Cronbach 's 0.90 ) , reproducibility ( intraclass correlation 0.70 ) , correlation with St. George 's Respiratory Questionnaire ( Spearman rho [ rs ] = 0.62 , 0.46 , 0.46 in the three trials ; P < 0.001 ) , and Breathlessness Cough and Sputum Scale ( AZ 1 , rs = 0.83 ; AZ 2 , rs = 0.83 ; P < 0.001 ) .