Subject characteristics: BLF online Breath Test (n=356 799)
| Variable | MRC 1 (n=105 322) | MRC 2 (n=179 843) | MRC 3 (n=29 753) | MRC 4 (n=29 098) | MRC 5 (n=12 783) |
| Height, cm | 170±10 | 166±9 | 166±9 | 166±10 | 167±10 |
| Body mass, kg | 76±10 | 80±18 | 86±21 | 87±23 | 85±24 |
| BMI, kg/m2 | 26±5 | 29±6 | 31±7 | 31±8 | 30±8 |
| Age, n (%) Under 40 years 40–49 years 50–59 years 60–69 years Over 70 years | 30 688 (29) 12 318 (12) 22 301 (21) 28 014 (27) 12 001 (11) | 30 258 (17) 19 520 (11) 41 971 (23) 57 844 (32) 30 250 (17) | 2164 (7) 2741 (9) 6944 (23) 10 621 (36) 7283 (24) | 1269 (4) 2068 (7) 6374 (22) 10 742 (37) 8645 (30) | 1133 (9) 1214 (9) 2882 (23) 4174 (33) 3380 (26) |
| Smoking, n (%) Smoker Non-smoker | 17 781 (17) 87 541 (83) | 31 999 (18) 147 844(82) | 5513 (19) 24 240 (81) | 5919 (20) 23 179 (80) | 2915 (23) 9868 (77) |
| Physical activity, n (%)* Active Inactive | 83 389 (79) 21 933 (21) | 115 375(64) 64 468 (36) | 16 526 (56) 13 227 (44) | 13 314 (46) 15 784 (54) | 4531 (35) 8252 (65) |
| Do you worry about getting out of breath? n (%) Yes No | 26 225 (25) 79 097 (75) | 120 708(67) 59 135 (33) | 23 660 (80) 6093 (20) | 26 008 (89) 3090 (11) | 11 528 (90) 1255 (10) |
Values are mean±SD for height, weight and BMI and n (%) of total subjects for other variables.
*Physical activity assessed as doing at least 20 min a day of any of the following activities: walking, cycling, gardening or anything else that makes the subject breathe faster.
BLF, British Lung Foundation; BMI, body mass index; MRC, Medical Research Council.