| Variables | Respondent’s age in years | Number of years in operation | Knowledge on waste management | Practice of personal protective equipment |
| Respondent’s age in years | 1 | |||
| Number of years in operation | 0.991** | 1 | ||
| Knowledge on waste management | 0.141 | 0.158* | 1 | |
| Practice of PPE | −0.147 | −0.034 | 0.130* | 1 |