Table 3.

Adjusted ORs^a between daily source-specific PM_2.5 concentrations and the occurrence of ST segment depressions.

		> 0.1 mV (n = 62)b		> 0.1 mV + slope (n = 46)c
Source-specific PM2.5	Lag	OR	95% CI	OR	95% CI
Crustal	Lag 0	0.80	0.47–1.36	0.76	0.42–1.35
	Lag 1	0.66	0.40–1.10	0.41	0.22–0.79
	Lag 2	1.18	0.68–2.06	1.17	0.65–2.09
	Lag 3	1.87	0.85–4.09	1.60	0.72–3.59
Long-range transport	Lag 0	0.94	0.84–1.05	0.98	0.86–1.10
	Lag 1	1.00	0.92–1.08	1.03	0.95–1.12
	Lag 2	1.11	1.02–1.20	1.11	1.02–1.21
	Lag 3	1.06	0.95–1.18	1.02	0.95–1.10
Oil combustion	Lag 0	0.87	0.57–1.32	0.95	0.61–1.49
	Lag 1	1.04	0.75–1.45	1.13	0.76–1.68
	Lag 2	1.10	0.83–1.46	1.33	0.98–1.80
	Lag 3	1.12	0.79–1.58	1.29	0.90–1.86
Salt	Lag 0	1.03	0.57–1.85	1.15	0.56–2.38
	Lag 1	0.72	0.37–1.40	0.90	0.44–1.81
	Lag 2	0.66	0.31–1.40	1.39	0.63–3.08
	Lag 3	1.55	0.83–2.89	1.93	1.00–3.72
Local traffic	Lag 0	0.91	0.69–1.21	0.89	0.64–1.23
	Lag 1	1.22	0.88–1.69	1.21	0.86–1.71
	Lag 2	1.53	1.19–1.97	1.37	1.03–1.83
	Lag 3	0.98	0.78–1.23	1.03	0.80–1.32

ORs calculated for an increase of 1 μg/m³ in exposure. Number of measurements = 312 for lag 0, 322 for lag 1, 314 for lag 2, and 311 for lag 3.

^aThe statistical model included the source-specific PM_2.5 concentration; a dummy for each subject; linear terms for time trend, temperature (lag 3), and relative humidity (lag 3); and a penalized spline (df = 3) for change in heart rate during exercise test.

^bST segment depression > 0.1 mV; n = number of events at minimum (lag 0).

^cST segment depressions > 0.1 mV with horizontal or downward slope; n = number of events at minimum (lag 0).