The proportion of the variance that was due to the unit level, the intra-class correlation,
was 27% for the psychosocial conditions, 23% for the safety climate and 12% for the safety
behaviour. Thus there was a considerable part of the variation in the psychosocial conditions
and safety climate perceptions that could be attributed to the unit. The variation in safety
behaviour that could be attributed to the unit was considerably lower but still significant.