Qualitative variables of the workers and their environment
| Variable | Categories | Coding |
| Age | <25 years | T1 |
| Between 25 and 40 years | T2 | |
| >40 years | T3 | |
| Body mass index (BMI=weight/height2) | From 17.00 to 18.49 (kg/m2)—low weight | W0 |
| From 18.50 to 24.99 (kg/m2)—normal weight | W1 | |
| From 25.00 to 29.99 (kg/m2)—overweight | W2 | |
| From 30.00 to 34.99 (kg/m2)—chronic overweight | W3 | |
| From 35.00 to 39.99 (kg/m2)—premorbid obesity | W4 | |
| Crop area | <5 ha | S1 |
| Between 5 and 10 ha | S2 | |
| >10 ha | S3 | |
| Cultivation system | Traditional mountain olive grove | O1 |
| Traditional olive grove with slopes <20% | O2 | |
| Traditional olive grove without slopes | O3 | |
| Intensive olive grove | O4 | |
| Super Intensive olive grove | O5 | |
| Organic olive grove (Traditional) | O6 | |
| Height | <1.60 m | A1 |
| Between 1.60 and 1.70 m | A2 | |
| >1.70 m | A3 | |
| Irrigation system | Dryland | R0 |
| Irrigation | R1 | |
| Origin | African | Afr |
| Spanish | Spa | |
| Eastern European | EurE | |
| Hispanic American | His | |
| Sex | Male | ML |
| Female | F | |
| Weight | <70 kg | P1 |
| Between 70 and 80 kg | P2 | |
| >80 kg | P3 |