Anonymity was assured by providing each respondent an addressed envelope
that allowed he/she returned the completed questionnaire to the
researchers. 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 (Cui et al., 2013).