Table 6.

Analysis of the multiplicative interaction between shift work and heat exposure on HUA

Variable	OR (95% CI)	P
Never shifts	1.00	-
Ever shifts	3.30(1.61–6.79)	0.001
Current shifts	2.40(1.25–4.61)	0.008
Heat exposure	3.04(1.21–7.61)	0.018
Never shifts × heat exposure	1.00	-
Ever shifts × heat exposure	0.41(0.13–1.25)	0.409
Current shifts × heat exposure	0.53(0.20–1.42)	0.533