Table 2.

Mean and specific percentiles for variables of the 20 study communities in the USA.

	Southern Communities					Northern Communities
	Mean	Min	25th	75th	Max	Mean	Min	25th	75th	Max
Full year
Total mortality	21.0	7.9	8.6	34.1	54.5	45.5	11.1	12.8	57.6	190.2
Mean temperature (°C)	20.0	15.6	18.4	21.4	23.0	11.1	9.1	9.2	12.9	13.2
Relative humidity (%)	69.2	59.8	65.5	73.7	75.5	67.0	62.4	64.2	69.8	71.0
Maximum 8 h O3 (ppb)	39.7	34.5	37.9	41.2	44.7	32.1	28.9	29.8	34.5	35.7
Spring
Total mortality	21.0	8.1	9.3	28.6	54.1	45.4	11.1	13.9	35.5	188.3
Mean temperature (°C)	19.6	15.2	18.6	20.6	22.5	9.9	7.7	8.2	11.6	12.0
Relative humidity (%)	66.8	60.1	64.4	69.0	72.5	63.3	59.4	60.9	65.2	66.8
Maximum 8 h O3 (ppb)	45.8	38.9	44.2	49.0	50.1	36.5	30.7	33.8	39.8	41.3
Summer
Total mortality	19.8	7.4	8.3	31.7	50.9	42.5	10.5	12.0	53.3	177.4
Mean temperature (°C)	27.9	25.8	27.4	28.5	29.0	22.3	20.6	20.8	23.9	24.4
Relative humidity (%)	70.1	56.8	66.2	75.9	77.5	67.3	63.8	64.7	69.0	70.7
Maximum 8 h O3 (ppb)	46.1	38.1	40.5	53.4	53.7	49.9	44.6	45.2	55.1	56.7
Autumn
Total mortality	20.3	7.7	9.1	26.6	52.4	44.3	10.9	13.4	33.9	184.3
Mean temperature (°C)	20.5	15.9	19.3	21.4	24.0	12.3	10.3	10.7	14.0	14.3
Relative humidity (%)	70.3	59.3	67.2	74.8	80.3	69.0	64.7	66.3	71.0	74.2
Maximum 8 h O3 (ppb)	38.9	31.3	37.7	41.8	44.7	25.4	20.3	23.3	27.3	28.2
Winter
Total mortality	23.2	8.7	9.5	37.5	60.8	50.0	12.0	14.0	63.0	211.1
Mean temperature (°C)	11.7	5.2	8.7	14.2	17.2	-0.2	-3.0	-2.5	2.0	2.2
Relative humidity (%)	70.3	62.9	67.2	74.2	75.1	68.2	61.8	61.9	74.6	75.9
Maximum 8 h O3 (ppb)	27.8	17.8	25.0	31.9	33.4	18.6	14.3	15.2	21.9	23.1