Table 1 Demographic data

Age, yr

70.1 ± 9.6

66.2 ± 11.2

59.7 ± 6.5

Height, m

1.6 ± 0.1

1.7 ± 0.1

1.7 ± 0.1

Male/Female

0/9

0/12

2/8

Limited cutaneous SSc (%)

100

100

Haemoglobin, mmol/l

7.8 ± 1.2^†

8.0 ± 0.6^‡

8.6 ± 0.8

Raynaud's phenomenon (%)

100

92

Raynaud's phenomenon at PFT, years

19.2 ± 10.6*

6.6 ± 8.3

Autoantibodies (no.)

12

ANA

10

6

Anti-centromere

7

5

Anti-topoisomerase

0

Modified Rodnan skin score

14.1 ± 5.7

11.9 ± 5.9

Smoking status

7/3/1

6/4/2

8/2/0

Never/former/current (no.)

6-minute walking distance, m

326 ± 102

430 ± 127

SvO2, %

62.7 ± 6.6*

72.5 ± 2.0

HRCT fibrosis score‡

4.9 ± 3.4^†

4.1 ± 3.4

HRCT ground glass score‡

7.1 ± 5.8^†

3.1 ± 5.5

HRCT total fibrosis score^‡

12.1 ± 6.8^†

7.4 ± 8.5