Table 2.

Clinical summary of patients with CTD-IP (n = 28)^a

Characteristics	Data
Age	52 (25–78)
Male gender	12
Female gender	16
Smoking history
Never	15
Former	6
Current	7
CTD history	28
DM/PM	16
RA	12
Abnormal RF/CRP level	25
Time since CTD diagnosis, yr	4.10 (2–11)
Time since CTD-IP diagnosis, yr	3.48 (0.5–10)

Abbreviations: CTD connective tissue disease, DM/PM dermatomyositis/polymyositis, RA rheumatoid arthritis, RF/CRP rheumatoid factor/C-reactive protein

^aData are expressed as the median (interquartile range) or number