Table 1 Baseline patient characteristics
Variable | n | All (n = 359) | SSc (n = 207) | RA (n = 45) | MCTD (n = 26) | Other (n = 81)a |
|---|---|---|---|---|---|---|
Age at first visit, y | 357 | 56 ± 13 | 55 ± 13 | 62 ± 14 | 49 ± 12 | 58 ± 12 |
Male, n (%) | 359 | 81 (23) | 40 (19) | 10 (22) | 3 (12) | 28 (35) |
Ethnicity, n (%) | 357 | Â | Â | Â | Â | Â |
 Caucasian |  | 223 (63) | 143 (69) | 22 (50) | 12 (46) | 46 (57) |
 Asian |  | 62 (17) | 28 (14) | 5 (11) | 9 (35) | 20 (25) |
 South Asian |  | 33 (9) | 17 (8) | 8 (18) | 2 (8) | 6 (7) |
 First nations |  | 24 (7) | 12 (6) | 4 (9) | 3 (12) | 5 (6) |
 Other |  | 15 (4) | 6 (3) | 5 (11) | 0 (0) | 4 (5) |
Positive smoking history, n (%) | 359 | 180 (50) | 94 (45) | 24 (53) | 12 (46) | 50 (62) |
Estimated annual income, $ | 359 | 80,135 ± 38,403 | 81,138 ± 41,542 | 81,850 ± 40,798 | 74,125 ± 32,098 | 78,549 ± 29,996 |
Baseline lung function | ||||||
 FVC, %-predicted | 350 | 77 ± 20 | 79 ± 21 | 75 ± 23 | 79 ± 16 | 70 ± 18 |
 DLCO, %-predicted | 336 | 56 ± 19 | 57 ± 19 | 56 ± 19 | 56 ± 18 | 54 ± 17b |
 6MWD, metres | 279 | 387 ± 123 | 395 ± 122 | 312 ± 116 | 430 ± 117 | 374 ± 116 |
Radiographic pattern, n (%) | 359 | Â | Â | Â | Â | Â |
 NSIP Pattern |  | 242 (67) | 173 (84) | 11 (24) | 14 (54) | 44 (54) |
 UIP Pattern |  | 46 (13) | 17 (8) | 17 (38) | 2 (8) | 10 (12) |
 Other/Not specified |  | 71 (20) | 17 (8) | 17 (38) | 10 (39) | 27 (33) |
Mortality, n (%) | 357 | 85 (24) | 66 (32) | 6 (13) | 3 (12) | 10 (12) |
Median follow up time, y (IQR) | 359 | 4 (2, 8) | 5 (2, 8) | 3 (1, 5) | 3 (1, 8) | 3 (1, 5) |