Table 1.
Baseline patient demographics
| Incident cohort | Prevalent cohorta | |||||||
|---|---|---|---|---|---|---|---|---|
| SSc | SSc-ILD | SSc | SSc-ILD | |||||
| JMDC | MDV | JMDC | MDV | JMDC | MDV | JMDC | MDV | |
| N | 933 | 4805 | 261 | 1810 | 2548 | 12,652 | 957 | 5505 |
| Sex, % | ||||||||
| Male | 21.9 | 18.7 | 20.7 | 17.2 | 17.5 | 16.0 | 17.8 | 18.1 |
| Female | 78.1 | 81.3 | 79.3 | 82.8 | 82.5 | 84.0 | 82.2 | 81.9 |
| Age, years | ||||||||
| Mean (SD) | 49.0 (13.5) | 67.2 (13.7) | 50.8 (12.9) | 66.9 (13.1) | 51.5 (12.6) | 66.6 (13.1) | 53.2 (11.4) | 67.0 (12.3) |
| Median (IQR) | 51 (42–58) | 69 (60–77) | 52 (45–60) | 69 (60–76) | 53 (45–60) | 68 (59–76) | 55 (47–61) | 68 (60–76) |
| Min, max | 3, 74 | 2, 99 | 9, 74 | 3, 96 | 2, 74 | 2, 102 | 3, 74 | 3, 96 |
| Age groups, % | ||||||||
| < 20 | 4.9 | 0.6 | 3.5 | 0.4 | 3.5 | 0.5 | 1.6 | 0.3 |
| 20–29 | 3.9 | 1.0 | 4.2 | 1.1 | 3.1 | 1.0 | 2.9 | 0.7 |
| 30–39 | 11.5 | 2.3 | 9.2 | 1.7 | 9.0 | 3.5 | 7.6 | 2.7 |
| 40–49 | 24.2 | 7.5 | 22.6 | 7.2 | 25.0 | 8.5 | 22.6 | 7.9 |
| 50–59 | 34.0 | 13.2 | 34.9 | 13.8 | 33.7 | 15.9 | 35.2 | 16.3 |
| 60–69 | 19.2 | 25.7 | 23.4 | 28.0 | 21.9 | 31.8 | 26.0 | 32.1 |
| 70–79 | 2.4 | 32.4 | 2.3 | 32.7 | 3.8 | 28.8 | 4.1 | 30.2 |
| ≥ 80 | 0.0 | 17.3 | 0.0 | 15.2 | 0.0 | 10.2 | 0.0 | 9.8 |
| < 65 | 90.4 | 34.2 | 88.1 | 35.4 | 88.6 | 42.9 | 86.8 | 41.7 |
| ≥ 65 | 9.7 | 65.8 | 11.9 | 64.6 | 11.4 | 57.2 | 13.2 | 58.3 |
| < 75 | 100.0 | 66.2 | 100.0 | 68.6 | 100.0 | 76.5 | 100.0 | 76.4 |
| ≥ 75b | 0.0 | 33.8 | 0.0 | 31.4 | 0.0 | 23.5 | 0.0 | 23.7 |
IQR interquartile range, JMDC Japanese Medical Data Centre, MDV Medical Data Vision, SD standard deviation, SSc systemic sclerosis, SSc-ILD SSc-associated interstitial lung disease
aPrevalent cohort includes prevalent and incident cases of SSc and SSc-ILD
bAs JMDC is an employment-related claims database, no data available for elderly people (≥ 75 years)