Table 1.

Comparison of demographics among three groups

	SAD-NSIP group	i-NSIP-Ab + group	i-NSIP-Ab-group	P
	N (%)	N (%)	N (%)
Patient’s number
Initial presentation	23(23.7)	30(30.9)	44(45.4)	0.050
After follow up	28(28.9)	31(32.0)	38(39.1)	0.306
Age (years), Mean ± SD
Initial presentation	49.4 ± 10.6	45.7 ± 10.0	49.5 ± 12.5	0.307
After follow up	50.4 ± 9.9	46.3 ± 10.6	48.5 ± 12.8	0.386
Male
Initial presentation	6/23(26.1)	6/30(20.0)	15/44(34.1)	0.405
After follow up	8/28(28.6)	7/31(22.6)	13/38(34.2)	0.569
Duration (months), Mean ± SD
Initial presentation	16.7 ± 27.6	10.2 ± 13.8	10.9 ± 15.4	0.378
After follow up	14.9 ± 25.3	9.8 ± 13.8	11.8 ± 16.3	0.575
Follow-up time (months), Mean ± SD
Initial presentation	48.4 ± 28.2	58.4 ± 32.7	54.9 ± 38.5	0.504
After follow up	51.9 ± 29.8	58.3 ± 32.5	55.2 ± 38.9	0.745
Smoking,
Initial presentation	2/23(8.7)	2/30(6.7)	4/44(9.1)	0.944
After follow up	2/28(7.1)	2/31(6.5)	4/38(10.5)	0.803

The demographic characteristics are shown in above Table. There were no differences among the three groups of the NSIP patients as classified at the time of surgical lung biopsy or after re-classification at the time of follow-up.