Table 4.

Results of ordinal logistic regression stratified by work type

Determinants of severe psychological distress	Long-haul drivers				Short-haul drivers
	OR	95% CI		p	OR	95% CI		p
Age
< 35 years	4.27	2.48	7.36	< 0.001	4.29	2.85	6.48	< 0.001
35–44 years	2.68	1.48	4.88	0.001	1.62	1.06	2.49	0.027
45–54 years	2.33	1.38	3.91	0.001	1.48	0.99	2.21	0.058
> 55 years	1				1
Employment type
Owner driver	1.17	0.61	2.24	0.645	0.70	0.41	1.20	0.194
Employee driver	1				1
Work for > 1 company
Yes	1.14	0.63	2.07	0.661	0.74	0.46	1.21	0.235
No	1				1
Shift type
Multiple trips between same base	1.03	0.62	1.72	0.912	0.81	0.54	1.23	0.326
Single long trip between 2 locations	0.74	0.47	1.17	0.200	0.75	0.39	1.46	0.400
Vehicle type
Multiple trips between 2 locations	1				1
Rigid truck and other	1.38	0.60	3.15	0.451	0.75	0.53	1.05	0.090
Road train	1.34	0.57	3.19	0.502	0.62	0.33	1.18	0.143
B Double	1.20	0.54	2.69	0.658	0.73	0.49	1.10	0.137
Articulated truck	1				1
Payment type
Other	1.07	0.43	2.68	0.887	1.34	0.72	2.50	0.353
Per trip/delivery	1.42	0.76	2.63	0.270	1.02	0.52	2.00	0.962
Single time pay	1.37	0.66	2.84	0.400	0.78	0.56	1.07	0.126
Km rate	1.12	0.69	1.83	0.647	1.06	0.41	2.78	0.898
Flat rate	1				1
Working hours
≤ 40 h	1.33	0.88	2.02	0.178	0.57	0.36	0.89	0.015
> 60 h	0.81	0.35	1.88	0.625	1.28	0.90	1.80	0.164
41–60 h	1				1
BMI
Obese	0.64	0.37	1.10	0.106	0.98	0.67	1.44	0.930
Overweight	0.58	0.30	1.09	0.092	1.03	0.68	1.57	0.887
Under or normal weight	1				1
Diagnosed conditions
1 condition	2.89	1.65	5.06	< 0.001	2.28	1.50	3.46	< 0.001
2 conditions	4.83	2.64	8.83	< 0.001	3.22	2.03	5.11	< 0.001
≥ 3 conditions	7.41	4.22	13.02	< 0.001	9.29	6.01	14.36	< 0.001
No conditions	1				1