Table 1

Demographic details and correlations with the E-RS total and CAT scores obtained from paper and electronic versions (Spearman’s rank correlation coefficient)

Variable	Units	Mean	SD	Correlations with E-RS total score obtained from		Correlations with CAT score obtained from
				Correlations with E-RS total score obtained from		Correlations with CAT score obtained from		Paper version	Electronic version	Paper version	Electronic version
				Age	years	75.6	5.9	0.00	−0.12	0.02	−0.04
BMI	kg/m²	22.1	3.0	0.04	−0.05	−0.04	−0.04
Cumulative smoking	pack-years	54.6	31.7	0.15	0.09	0.13	0.12
FVC	Litres	3.06	0.75	−0.21	−0.18	−0.30*	−0.32*
FVC	% pred	99.0	21.1	−0.30*	−0.25*	−0.30*	−0.37*
FEV₁	Litres	1.71	0.58	−0.42*	−0.39*	−0.50*	−0.44*
FEV₁	% pred	70.1	21.5	−0.47*	−0.45*	−0.49*	−0.46*
FEV₁/FVC	%	55.3	11.2	−0.45*	−0.42*	−0.44*	−0.29^*
CAT score obtained from paper version		10.0	7.4	0.81*	0.64*	–	–
CAT score obtained from electronic version		8.6	7.8	0.76*	0.72*	–	–
E-RS total score obtained from paper version		6.8	7.4	–	–	0.81*	0.76*
E-RS total score obtained from electronic version		5.0	6.6	–	–	0.64*	0.72*

*P<0.05.
BMI, body mass index; CAT, the COPD Assessment Test; E-RS, the Evaluating Respiratory Symptoms in COPD; FEV₁, forced expiratory volume in 1 s; FVC, forced vital capacity.