Ambient fine particulate air pollution triggers ST-elevation myocardial infarction, but not non-ST elevation myocardial infarction: a case-crossover study

Table 2 Distribution of hourly pollutant concentrations and weather characteristics during the study period (January 1, 2007 to December 31, 2010)

Pollutant/weather parameter	n	Mean	Standard deviation	Minimum	25^th	50^th	75^th	Maximum	IQR	Case–control IQR
PM_2.5	1283	8.00	5.70	0.27	3.9	6.7	10.2	43.0	6.3	5.3
(μg/m³)	1283	8.00	5.70	0.27	3.9	6.7	10.2	43.0	6.3	5.3
Ultrafine particles	1231	5466	2,865	480	3503	5029	6874	37,291	3371	3116
(#/cm³)	1231	5466	2,865	480	3503	5029	6874	37,291	3371	3116
Accumulation mode particles	1231	996	643	108	501	849	1322	4444	821	713
(#/cm³)	1231	996	643	108	501	849	1322	4444	821	713
Temperature	1460	10	10	-13	2	11	20	30	18	5
(°C)	1460	10	10	-13	2	11	20	30	18	5
Relative humidity	1461	65	12	30	57	66	74	94	17	11
(%)

ISSN: 1743-8977