Table 1

Time series studies of PM_2.5 and mortality and hospital admissions

Multicity study		Total		Multicity study		Single-city study
Outcome		Mortality	Hospital admission	Mortality	Hospital admission	Mortality	Hospital admission
Total		68	54	17	11	51	43
Disease	Respiratory	33	43	7	9	26	34
	Cardiovascular	41	34	9	9	32	25
	All-cause	56	2	15	0	41	2
	Other	7	3	2	2	5	1
WHO region	American region A	33	31	13	8	20	23
	European region A	20	10	2	1	18	9
	Western Pacific region B	6	6	0	0	6	6
	American region B	6	2	0	0	6	2
	Western Pacific region A	4	4	3	2	1	2
	South-East Asia region D	0	1	0	0	0	1
Age group	All ages	54	21	16	1	40	20
	Elderly	26	28	5	9	21	19
	Not elderly	4	4	1	1	3	3
	Adult	1	2	0	0	1	2
	Young adult	0	9	0	2	0	7
	Children	1	18	0	3	1	15
	Other	2	3	0	0	2	3