Table 1.

Comparisons between patients with positive and negative IgG antibody

Variables	Positive IgG (n = 397)	Negative IgG (n = 87)	Negative IgG (≥ 2 tests) (n = 37)	p
Age (years)	51.2 ± 13.9	49.6 ± 17.2	51.8 ± 19.4	0.365
Gender (male, %)	190 (47.8)	43 (49.4)	13 (35.1)	0.791
White blood cell count on admission	5.3 ± 1.8	7.1 ± 3.1	6.9 ± 2.7	< 0.001
Lymphocyte count on admission	1.3 ± 0.0	1.6 ± 0.1	1.6 ± 0.7	0.001
Neutrophil count on admission	3.5 ± 1.6	5.0 ± 3.0	4.7 ± 2.5	< 0.001
White blood cell count at follow-up	6.3 ± 1.7	6.5 ± 1.8	6.2 ± 1.8	0.387
Lymphocyte count at follow-up	2.1 ± 0.6	2.1 ± 0.6	2.0 ± 0.7	0.738
Neutrophil count at follow-up	3.7 ± 1.4	3.9 ± 1.4	3.6 ± 1.3	0.296
Maximum duration of IgG test	50.5 ± 14.8	43.3 ± 15.0	50.6 ± 12.1	< 0.001
Maximum duration of IgG test*, median (min and max value)	51 (10–100)	42 (2–90)	50 (28–90)	< 0.001
Abnormal CT findings at follow-up# (which indicate residual infection)	259/372	22/64	10/32	< 0.001

All comparisons were made between positive IgG and negative IgG groups

IgG immunoglobulin G, CT computed tomography

*Presented as median (minimum and maximum value), compared using rank-sum test

^#Any chest CT findings that suggested residual infection during follow-up were defined as abnormal