Table 2

Particle measures: descriptive statistics

							Descriptive statistics (n/day)†
City	Pollutant*	Start date	End date	Number of days	Number ≥150 μg/m³	Number of days missing	Mean	SD	1st Q	Median	3rd Q
*Average pollutant measures on same and previous day to admission: units μg/m³. †Descriptive statistics exclude days ≥150 μg/m³. ‡TSP rescaled on PM₁₀.
Barcelona	PM₁₀	01/01/94	31/12/96	1096	0	0	55.7	18.4	42.4	53.3	66.0
	BS	01/01/94	31/12/96	1096	0	0	38.7	14.0	28.7	36.2	46.3

Birmingham	PM₁₀	20/03/92	31/12/94	1017	0	84	24.8	13.1	15.5	21.5	30.0
	BS	01/01/92	31/12/94	1096	0	1	13.3	7.7	8.4	11.5	15.7

London	PM₁₀	25/01/92	31/12/94	1072	0	89	28.4	12.3	20.0	24.9	34.0
	BS	01/01/92	31/12/94	1096	0	0	13.1	7.5	8.2	11.3	15.7

Milan	PM₁₀‡	19/01/90	31/12/96	2904	12	83	51.5	22.7	35.3	45.9	61.3

Netherlands	PM₁₀	01/01/92	30/09/95	1369	5	5	39.5	19.9	25.7	33.4	48.7
	BS	01/01/89	30/09/95	2464	0	1	12.5	11.3	5.7	9.1	14.8

Paris	PM₁₃	01/01/92	30/09/96	1735	0	4	22.7	10.8	15.1	20.1	27.6
	BS	01/01/92	30/09/96	1735	0	0	22.5	14.2	12.9	18.6	28.1

Rome	PM₁₀‡	01/01/95	18/07/97	930	0	0	52.5	12.9	43.6	51.9	59.5

Stockholm	PM₁₀	09/03/94	08/12/96	1006	0	0	15.5	7.2	10.2	13.6	18.9