Table 4.

FEV₁/FVC, FEV₁% predicted, exacerbation frequency and mMRC in different CAT categories

Variables	Mild 0≤CAT≤10	Medium 11≤CAT≤20	High 21≤CAT≤30	P-value
FEV1/FVC	0.47±0.13#,▲	0.44±0.12*,▲	0.39±0.14*,#	<0.001
FEV1 % predicted	54.73±20.91#,▲	48.28±17.48*,▲	42.72±18.79*,#	<0.001
Exacerbation frequency in the last year	0.28±0.59#,▲	0.92±1.22*,▲	1.86±1.37*,#	<0.001
mMRC	1.18±0.69#,▲	1.79±0.83*,▲	2.50±0.71*,#	<0.001

Notes:

^*P<0.05 vs 0≤CAT≤10;

^#P<0.05 vs 11≤CAT≤20;

^▲P<0.05 vs 21≤CAT≤30.

Abbreviations: CAT, COPD Assessment Test; FEV₁, forced expiratory volume in 1 second; FVC, forced vital capacity; mMRC, modified Medical Research Council.