Table 7 Results of analyses of variance of the relation between gain scores of intermediate objectives and change in whole‐body vibration (WBV) exposure level; mean levels and standard deviations of WBV change (post–pre) per tertile of the intermediary objective.

	n	First tertile	Second tertile	Third tertile	F value	p Value
Knowledge of OH	16	0.10±0.26	−0.01±0.09	−0.17±0.11	4.81	0.047
Knowledge of OP	10	0.11±0.24	−0.17±0.11	−0.03±0.08	1.02	0.344
Company policy on WBV	13	0.06±0.22	−0.03±0.23	0.09±0.22	0.04	0.853
Attitude of drivers	69	−0.02±0.19	0.00±0.26	−0.04±0.29	0.06	0.803
Actual behaviour of drivers	74	−0.05±0.28	−0.01±0.25	0.01±0.22	0.84	0.364
Intended behaviour	70	0.04±0.19	−0.02±0.16	−0.03±0.28	1.1	0.290
Risk control score*	110	0.01±0.32	−0.09±0.27	−0.26±0.62	5.4	0.022

*For this variable we did not use tertiles but the actual score (respectively 0, 1, 2).