Table 2.

Study 2: Mean (SD) and Median Particulate Matter (PM_2.5μg/m³) for Each Study Condition.

	Pre-ECIG Use †		During ECIG Use ‡
Condition	Mean (SD)	Median	Mean (SD)	Median
15 W 0 mg/ml	2.22 (1.35)	1.75	22.39 (55.70)	1.97
15 W 3 mg/ml	2.64 (3.89)	1.30	23.99 (63.14)	4.35
15 W 6 mg/ml	2.91 (1.16)	3.19	6.39 (7.83)	4.05
45 W 0 mg/ml	1.60 (0.84)	1.75	181.78 (311.96) *+	61.07
45 W 3 mg/ml	2.57 (1.27)	2.52	46.13 (75.39)*	6.29
45 W 6 mg/ml	4.31 (5.39)	2.85	93.36 (164.01)*+	13.47

^†30 minutes prior to the first 10-puff directed bout.

^‡5 minutes during the 10-puff bout.

^*indicates difference from pre-ECIG use

⁺indicates difference from 15 W with the same liquid concentration (only tested during ECIG use).