Table 3. Whole blood lymphocyte subsets in healthy subjects after ozone and air exposure.

Lymphocyte	Exposure	Sampling time
(%)		1.5 h PE	6 h PE	18 h PE
CD3+	Air	64.1 ± 21.6	63.2 ± 19.9	68.7 ± 5.7
	Ozone	58.3± 29.5	59.7 ± 15.7	66.4 ± 7.6
CD4+	Air	35.6 ± 11.4	36.5 ± 11.1	41.5 ± 5.9
	Ozone	33.2 ± 17.6	34.0 ± 7.8	39.8 ± 7.9
CD8+	Air	29.1 ± 9.9	26.1 ± 8.7	26.5 ± 6.3
	Ozone	24.0 ± 12.9	26.9 ± 7.7	25.3 ± 6.7
CD19+	Air	5.3 ± 2.4	6.7 ± 7.1	12.1 ± 3.7
	Ozone	3.9 ± 2.5	4.7 ± 2.4	10.4 ± 3.4

Data represent are illustrated as means with standard deviation. Comparisons of post air and ozone cell numbers performed using a paired t-test.