Table 5.

Comparison of COPD severity (% predicted FEV₁) between ethnic groups among all COPD patients (n=2,824) and spirometry-confirmed COPD patients (n=1,509)

Ethnic group	% predicted FEV1 (ECSC-derived predicted values)			% predicted FEV1 (ethnicity-specific predicted values)
	B coefficient	95% CI	Standardized β	B coefficient	95% CI	Standardized β
All COPD patients (n=2,824)
White
Black or black British	−7.59	−10.0 to −5.2	−0.111	−1.09	−1.6 to 3.8	0.016
Asian or Asian British	−4.23	−7.1 to −1.3	−0.038	0.37	−2.7 to 3.4	0.003
Mixed	−4.95	−10.0 to 0.1	0.033	−4.95	−10.1 to 0.1	−0.032
Chinese/other	−3.08	−9.7 to 3.5	0.016	−3.10	−9.7 to 3.5	−0.016
Spirometry-confirmed COPD (n =1,509)
White
Black or black British	−8.99	−12.00 to −5.97	−0.140	−1.63	−5.02 to 1.76	0.016
Asian or Asian British	−5.12	−10.22 to −0.02	−0.050	−1.14	−6.58 to 4.30	0.003
Mixed	−7.48	−15.27 to 0.31	0.050	−7.46	−15.27 to 0.34	−0.032
Chinese/other	−2.46	−9.61 to 4.69	0.012	−2.48	−9.63 to 4.67	−0.016

Notes: A sensitivity analysis using ethnicity-specific predicted FEV₁ values is included. Multiple linear regression controlling for age, sex, smoking status, deprivation, and practice clustering. Excludes people with no recording of ethnicity. Bold indicates statistical significance, P<0.05.

Abbreviations: ECSC, European Coal and Steel Community; FEV₁, forced expiratory volume in 1 second; CI, confidence interval.