Table 1.

Comparison of clinical characteristics between children with and without Bordetella pertussis infection [cases (%)].

	BP group (n = 221)	Non-BP group (n = 107)	X2	P
Spastic cough	200 (90.50)	85 (79.44)	7.740	.005
Whoop	74 (33.48)	26 (24.30)	2.870	.09
Cyanosis	65 (29.41)	29 (27.10)	0.188	.665
Apnea	26 (11.76)	7 (6.54)	2.173	.14
Fever	54 (24.43)	31 (28.97)	0.773	.379
Rhinorrhea	115 (52.04)	44 (41.12)	3.439	.064
Nasal obstruction	72 (32.58)	24 (22.43)	3.587	.058
Pneumonia detected in image results	115 (52.04)	61 (57.01)	1.838	.175
inpatient d (d, $\overline{\text{x}}\pm \text{s}$)	8.61 ± 6.24	8.85 ± 5.50	24.832	.415
WBC (×109/L, $\overline{\text{x}}\pm \text{s}$)	15.59 ± 8.53	10.86 ± 4.90	251.509	.247
L (%, $\overline{\text{x}}\pm \text{s}$)	67.45 ± 12.72	61.00 ± 14.60	205.140	.03

WBC = White blood cell.