Table 1.

Clinicodemographic characteristics of the study population, both the worker group and the control one. Both groups have no differences of statistical significance with regard to the parameters; SD is standard deviation.

Parameter	Control group	Worker group	P value
Age (mean ± SD) (years)	36.87 ± 11.7 (24–60 years)	37.06 ± 14.18 (18–65 years)	>0.05
Sex			>0.05
Male	80%	75%
Female	20%	25%
BMI (mean ± SD) (kg/m)	25.73 ± 2.2	27.09 ± 4.96	>0.05
Duration in work/years
0–10 years		57 (72.2%)
11–20 years		17 (21.5%)
21–30 years		2 (2.5%)
31–40 years		3 (3.8%)
Haemoglobin, Hb (g/dl)
Mean ± SD	13.5 ± 1.0	13.9 ± 1.2	>0.05