Blue flags (subjective perceptions and beliefs about work)
Perceptions of heavy work
Inability to modify work
Job stress
Workplace social support
Job satisfaction
Expectation for return to work
Fear of re-injury
Black flags (factual circumstances surrounding work)
Rates of pay
Negotiated entitlements
Sickness certification policies
Wage reimbursement rates
Availability of modified duty
Management style
Labour union involvement
Employer size
Organisational structure
Work schedules and shifts
Heavy physical loads