Table 1.

Patient characteristics and self-reported health behaviors among COPD phenotypes

Variable	COPD only (n = 970)		Emphysema only (n = 399)		Chronic bronchitis only (n = 2071)		P
	n	%	n	%	n	%
Male	559	57.63	248	62.16	762	36.79	<0.0001
Female	411	42.37	151	37.84	1309	63.21	<0.0001
White non-hispanic	866	89.28	346	86.72	1641	79.24	<0.0001
Black non-hispanic	50	5.15	26	6.52	189	9.13	0.0001
Hispanic	23	2.37	9	2.26	93	4.49	0.0002
Other	31	3.20	18	4.51	148	7.15	<0.0001
High school graduate or less	245	25.26	109	27.32	486	23.47	0.2140
Some college or higher	725	74.74	290	72.68	1585	76.53	0.2140
Income: ≤$25,000	278	28.66	120	30.08	538	25.98	0.1239
Income: $25,000–$49,999	320	32.99	125	31.33	631	30.47	0.3822
Income: $50,000–$74,999	152	15.67	66	16.54	377	18.20	0.1982
Income: ≥$75,000	158	16.29	64	16.04	391	18.88	0.1284
Income: declined to answer	62	6.39	24	6.02	134	6.47	0.9412
Full-time employed	122	12.58	56	14.04	633	30.56	<0.0001
Part-time employed	63	6.49	32	8.02	198	9.56	0.0110
Self-employed	46	4.74	25	6.27	142	6.86	0.0551
BMI: underweight	14	1.44	12	3.01	28	1.35	0.1799
BMI: overweight	286	29.48	127	31.83	569	27.47	0.1676
BMI: normal	232	23.92	128	32.08	440	21.25	<0.0001
BMI: obese	428	44.12	130	32.58	972	46.93	<0.0001
BMI: decline to answer	10	1.03	2	0.50	62	2.99	<0.0001
Never smoked	111	11.44	28	7.02	703	33.95	<0.0001
Former smoker	544	56.08	223	55.89	698	33.70	<0.0001
Current smoker	315	32.47	148	37.09	670	32.35	0.1875
Currently consume alcohol	529	54.54	247	61.90	1255	60.60	0.0034
Currently exercise	421	43.40	168	42.11	1175	56.74	<0.0001
	Mean	SD	Mean	SD	Mean	SD
Age	63.24	10.90	63.30	13.32	51.38	14.80	<0.0001
Years diagnosed	7.57	7.43	9.39	9.63	16.23	14.80	<0.0001
CCI*	2.00	1.47	1.82	1.28	1.70	1.24	<0.0001

Note:

^*A score calculated by weighting the presence of specific comorbidities based on their association with future mortality and summing the results.

Abbreviations: CCI, Charlson comorbidity index, COPD, chronic obstructive pulmonary disease; BMI, body mass index; SD, standard deviation.