Table 1

Prevalence of sample characteristics at baseline across IMD deprivation quintiles results where the association was statistically significant at the 5% level

	IMD
	Q1 most deprived	Q2	Q3	Q4	Q5 least deprived	Total	p Value*
All patients	26% 1915	22% 1570	20% 1476	17% 1256	14% 1046	7263	<0.001†
Gender
Male	25% 959	21% 825	20% 785	18% 709	15% 592	3870	0.001
Female	28% 956	22% 745	20% 691	16% 547	13% 454	3393	0.001
Age
<60	43% 495	23% 266	18% 207	11% 121	5% 61	1150	<0.001
60–64	32% 322	23% 229	20% 198	15% 150	10% 95	994
65–69	25% 392	21% 337	21% 327	18% 290	14% 225	1571
70–74	22% 322	21% 310	20% 303	17% 257	20% 290	1482
75–79	19% 223	21% 246	20% 234	23% 260	16% 184	1147
≥80	18% 161	20% 182	23% 207	19% 178	21% 191	919
Smoking status
Current	38% 600	23% 357	18% 291	13% 206	8% 120	1574	<0.001 <0.001
Ex	23% 1179	22% 1111	21% 1056	18% 923	16% 812	5081
Never	17% 77	18% 78	22% 97	23% 104	20% 88	444
Not known	36% 59	15% 24	20% 32	14% 23	16% 26	164
Mental health disorder comorbidity
No	26% 1725	22% 1456	21% 1382	17% 1176	15% 991	6730	<0.001
Yes	36% 190	21% 114	18% 94	15% 80	10% 55	533	<0.001
Patient’s living arrangements
House/flat with other	24% 1076	21% 961	21% 930	18% 827	16% 702	4496	<0.001 <0.001
House/flat alone	32% 651	22% 460	19% 399	15% 311	11% 235	2056
Other	33% 52	25% 40	20% 32	15% 23	6% 10	157
Not known	25% 136	20% 109	21% 115	17% 95	18% 99	554
Patient-reported MRC dyspnoea score at assessment
Grades 1/2	22% 254	19% 221	22% 262	18% 206	20% 230	1173	<0.001 <0.001
Grade 3	25% 655	21% 556	21% 539	19% 481	14% 359	2590
Grade 4	28% 644	24% 552	19% 438	16% 366	13% 288	2288
Grade 5	29% 185	22% 140	20% 123	16% 98	13% 84	630
Not known	30% 177	17% 101	20% 114	18% 105	15% 85	582

Note: Percentages for the reported variables total 100% horizontally across the IMD quintiles.
*χ² test: first p values exclude not known, second p value includes not known.
†Goodness-of-fit test: null hypothesis—all five quintile categories have equal frequencies.
IMD, Index of Multiple Deprivation; MRC, Medical Research Council.