Covariates to be controlled
| Covariate | Description of factor |
| Years on the job | People tend to be injured more in jobs they are either new at or too experienced that they become complacent |
| Reporting channels | People tend to report when there are safety representatives/processes in place |
| Nature of workplace injury or illness | People tend to report only serious injuries or illnesses |
| Bias | Research participants may be inherently biased on their perception of health and safety in their organisation based on past experiences in industry or at their employer |
| Size of employer | People tend to think large-scale companies have good health and safety processes in place compared with smaller organisations |
| Perception of safety experts | Safety experts who shall be interviewed may have their own perceptions on what influences health and safety reporting |