Table 2.

Contents of SP and CGRP in bronchoalveolar lavage fluid of guinea pigs with chronic cough

Group	SP (ng/mL)	CGRP (pg/mL)
Normal control	8.02 ± 1.45	5.13 ± 0.81
Inhalation of citric acid for 5 days	8.86 ± 1.97	5.96 ± 1.26
Inhalation of citric acid for 10 days	10.52 ± 2.28	5.66 ± 1.55
Inhalation of citric acid for 15 days	12.03 ± 0.65#,*	8.52 ± 1.37#,*
Inhalation of citric acid for 20 days	11.91 ± 2.56#,*	8.61 ± 1.82#,*
Inhalation of citric acid for 25 days	10.22 ± 1.89#,*	7.03 ± 1.31#,*

SP, substance P; CGRP, calcitonin gene-related peptide.

*P < 0.05 vs. 5 days; ^#P < 0.05 vs. normal control.