Table 5 Ischaemic heart disease mortality and noise exposure at 85dB(A) or higher: odds ratios associated with each 10 years of exposure, assuming a constant trend in exposed group only*.

	Crude OR	Adj† OR (95% CI)	Adj‡ OR (95% CI)
Both sites	0.96	0.94 (0.81–1.09)	0.91 (0.76–1.09)
Site A	0.85	0.84 (0.67–1.05)	0.79 (0.59–1.07)
Site B	1.06	1.01 (0.82–1.24)	1.02 (0.81–1.29)

*Model included dichotomous exposure variable (years at 85dB(A) or higher exposure)/10.

†Model included five pre‐employment measures: see table 3.

‡Model included five pre‐employment measures and duration of employment.