Table 1.

Description of model variables

Variable	Anticipated direction of effect
Age (in decades)	Older age*
Gender	Female*
First language	Non-English*
Predisability income	Higher income*
Reimbursement for opioid prescription in the first 4 weeks of a claim	Opioid reimbursement*
Prior claim(s)	Prior claim*
Union membership	Union member†
Employer RTW programme	RTW programme†
Work relatedness	Work related†
Reimbursement for ≥3 chiropractic treatments in the first 4 weeks of a claim	Chiropractic care†
Reimbursement for ≥3 physiotherapy treatments in the first 4 weeks of a claim	Physiotherapy care†

*Associated with slower claim closure.

†Associated with faster claim closure.

RTW, return to work.