Table 1.

Characteristics of the subject (N=30).

Characteristics	Groups				p∗
	Control		Treatment
	N (%)	Mean ± SD; median (min–max)	N (%)	Mean ± SD; median (min–max)
Age		36.13 ± 9.49; 36 (22–53)		36.00 ± 7.00; 37 (23–44)	1.00
Sex					0.10
Male	11 (73.3%)		15 (100%)
Female	4 (26.7%)		0 (0%)
Length of work		15.4 ± 8.45; 19 (2–25)		15.6 ± 6.17; 17 (4–20)	0.68
History of respiratory disease					1.00
None	14 (93.3%)		14 (93.3%)
Bronchitis	1 (6.7%)		1 (6.7%)
History of allergy					0.22
None	12 (80.0%)		15 (100%)
Food	2 (13.3%)		0 (0%)
Drug	1 (6.7%)		0 (0%)
History of smoking					0.06∗
No	12 (80.0%)		6 (40.0%)
Yes	3 (20.0%)		9 (60.0%)

∗Fisher's exacttest.