Table 1: Demographic variables of respondents (n=267).

Variable	Exposed Group (n=174)	Control Group (n=93)	P
Age (years), Mean±SD	35.54±8.76	37.30±7.98	t=-1.608, df=265 p-value= 0.109
Height (cm), Mean±SD	173.41±7.51	172.28±6.39	t=1.235, df=265 p-value= 0.218
Weight (kg), Mean±SD	74.25±13.74	74.36±11.69	t=-0.064, df=265 p-value= 0.949
BMI (kg/m2), Mean±SD	24.66±4.05	25.07±3.85	t=-0.809, df=265 p-value= 0.419
Work experience (years), Mean±SD	9.20±5.5	9.58±5.34	t=-0.542, df=265 p-value= 0.588
Number of smokers, n (%)	24(13.8)	10(10.8)	χ2=0.504, OR=0.753, p-value=0.478