Table 11.

Final model for the electrical contractors (number of remaining accidents = 566).

Accident Factor	Model Parameters	Coefficient	Std. Err.	z	p
	Constant	1.862	0.786	2.369	0.018 *
SoI	Machinery	−0.733	0.445	−1.646	0.100 †
	Parts and materials	−0.764	0.336	−2.276	0.023 *
	Structures and surfaces	−1.247	0.381	−3.272	0.001 **
	Tools, instruments, and equipment	−1.613	0.381	−4.235	2.29 × 10−5 ***
	Other	−1.072	0.545	−1.966	0.049 *
PT	Alteration or rehabilitation	−0.607	0.651	−0.933	0.351
	New project or new addition	−0.635	0.629	−1.009	0.313
	Maintenance or repair	−1.082	0.637	−1.699	0.089 †
	Other	−2.456	0.751	−3.268	0.001 **
CoI	Installing equipment (HVAC and other)	0.445	0.435	−1.023	0.306
	Installing plumbing, lighting fixtures	−0.420	0.476	−0.883	0.377
	Interior plumbing, ducting, electrical work	−1.032	0.450	−2.290	0.022 *
	Temporary work (buildings, facilities)	−0.389	0.526	−0.740	0.459
	Other	−0.735	0.421	−1.748	0.081 †

Significance levels: 0–0.001: ***; 0.001–0.01: **; 0.01–0.05: *; 0.05–0.1: ^†. HVAC: heating, ventilation, and air conditioning.