In addition, another 250 questionnaires were administrated
to workers in four construction projects. The procedure of
administration also demonstrated anonymity to respondents by
having them place completed questionnaires in a sealed collection
box. Of 500 questionnaires initially distributed, 215 were completed
and returned. Of those, 213 were sufficiently completed to
be included in data analysis, producing a usable response rate of
43%. Respondent characteristics are shown in Table 1. The sample
size and response rate is comparable with previous safety studies
using structural equation modeling