Table 1.

Background data (n = 121)

Teachers total		121
Gender	Female	106 (88%)
	Male	15 (12%)
Age groups	18–29 years	9 (7%)
	30–39 years	31 (26%)
	40–49 years	41 (34%)
	50–59 years	38 (31%)
	60–68 years	3 (2%)
Professional categories	Elementary school	43 (35%)
	Upper comprehensive school	43 (35%)
	Secondary school	35 (29%)
	Class teacher	41 (34%)
	Subject teacher	80 (66%)
Professional experience	Years (range)	1–38
	Years (mean)	15.45 (SD 9.6)
Chronic diseases	Chronic pulmonary disease	25 (21%)
	Allergic rhinitis	26 (21%)
	Reflux disease	8 (7%)
Operations		5 (4%)
Smoking	Never smoker	98 (81%)
	Ex-smoker or current smoker	23 (19%)