The effect of changes to GOLD severity stage on long term morbidity and mortality in COPD

Respiratory Research

Table 3 Baseline characteristics

	n = 4885
Age (years)	68 (60–75)
Female	2505 (51.3%)
BMI (kg/m2)^a	25.7 (22.7–29.2)
Social deprivation^a
1 - most deprived	2091 (43.4%)
2	950 (19.7%)
3	547 (11.3%)
4	772 (16.0%)
5 - most affluent	460 (9.5%)
Rurality^a
Large Urban Areas	4357 (90.4%)
Other Urban Areas	164 (3.4%)
Small Towns	19 (0.4%)
Accessible Rural	280 (5.8%)
History of hypertension medication	2363 (48.4%)
History of dyslipidaemia	1645 (33.7%)
History of renal disease	99 (2.0%)
History of cardiovascular events	766 (15.7%)
History of cardiovascular prevention	3101 (63.5%)
Charlson Score
0	3062 (62.7%)
1	1173 (24.0%)
2	393 (8.0%)
3	156 (3.2%)
4	70 (1.4%)
5	22 (0.5%)
over 6	9 (0.2%)
Smoking history (pack years)	38 (25–50)
Current smoking status^a
Current	1188 (24.3%)
Quitting^b	1551 (31.8%)
Former	1830 (37.5%)
Never	310 (6.4%)
FEV₁(litres)	1.54 (1.15–2.05)
FEV₁ as percentage of predicted	68.1 (53.7–81.6)
Modified MRC dyspnoea score	1 (1–2)
Baseline GOLD stage
A	2420 (49.5%)
B	1268 (26.0%)
C	476 (9.7%)
D	721 (14.8%)

BMI body mass index, FEV₁ forced expiratory volume in one second, MRC Medical Research Council, GOLD Global Initiative for Chronic Obstructive Lung Disease
^aData missing for some patients: BMI for 139, social deprivation & rurality for 65, smoking pack years for 72, current smoking status for 6
^b“quitting” means the patient is a current smoker who is either trying to or is contemplating giving up smoking
Data are median (IQR) or n (%)

ISSN: 1465-993X