Table 4.

Subject Characteristics and ACPA Positivity in LTRC Patients With IPF Compared With NJH Patients With IPF

Characteristic	LTRC IPF (n = 11)	NJH IPF (n = 80)	P Valuea
Age, y	63 ± 9	68 ± 7	.01
Female sex	5 (46)	12 (15)	.03
Ever smoker	10 (91)	57 (71)	.28
IgA-ACPA (+)	7 (64)	17 (21)	< .01
IgG-ACPA (+)	1 (9)	6 (8)	1.0
FVC, % predicted	70 ± 24	68 ± 15	.74
Dlco, % predicted	28 ± 5	43 ± 16	< .01

Data are presented as mean ± SD or No. (%). LTRC = Lung Tissue Research Consortium. See Table 1 and 2 legends for expansion of other abbreviations.

^aP values are comparing LTRC IPF vs NJH IPF using Student t test, χ² test, or Fisher exact test as appropriate.