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Table 2

GOLD 2011 and GOLD 2017 ABCD classifications by GOLD airflow limitation severity stages 2–4

GOLD airflow limitation severity
Stage 2Stage 3Stage 4Total
GOLD 2011
Group A, N (%)193 (37.8)00193 (21.2)
Group B, N (%)267 (52.4)00267 (29.3)
Group C, N (%)10 (2.0)33 (12.1)14 (10.8)57 (6.3)
Group D, N (%)40 (7.8)239 (87.9)116 (89.2)395 (43.3)
Total, N (%)510 (55.9)272 (29.8)130 (14.3)912 (100)
GOLD 2017
Group A, N (%)188 (36.9)26 (9.6)11 (8.5)225 (24.7)
Group B, N (%)244 (47.8)163 (59.9)69 (53.1)476 (52.2)
Group C, N (%)15 (2.9)7 (2.6)3 (2.3)25 (2.7)
Group D, N (%)63 (12.4)76 (27.9)47 (36.2)186 (20.4)
Total, N (%)510 (55.9272 (29.8)130 (14.3)912 (100)