Table 2. Size-Fractionated, Gravimetrically-Determined, and Integrated ELPI Fine and Ultrafine Particulate Mass from Mainstream Smoke: Geometric Means (95% CI^a).

		geometric mean (95% CI)
description	cut point (μm)b	TPc	SMc	geo. mean ratio (TP/SM)	p-value
gravimetric microbalance datad
fine particulate (mg/session)	0.257	11.02 (9.98, 12.17)	11.92 (10.80, 13.15)	0.92	0.0024*
	0.375	6.759 (6.293, 7.259)	7.293 (6.793, 7.830)	0.93	0.0015*
	0.602	6.556 (6.130, 7.011)	6.928 (6.522, 7.338)	0.95	0.0178*
	other fine	5.693 (5.203, 6.230)	5.965 (5.546, 6.415)	0.95	0.0779
	sum	30.38 (28.14, 32.81)	32.50 (30.29, 34.88)	0.93	0.0002*
ultrafine particulate (μg/session)	sum	154.6 (136.6, 174.9)	161.5 (145.2, 179.8)	0.96	0.4215
integrated ELPI datae
fine particulate (mg/run)	0.093	0.00110 (0.00096, 0.00126)	0.00120 (0.00105, 0.00136)	0.92	0.1543
	0.153	0.00496 (0.00432, 0.00570)	0.00528 (0.00459, 0.00606)	0.94	0.2547
	0.257	0.0318 (0.0275, 0.0369)	0.0334 (0.0290, 0.0384)	0.95	0.3697
	0.375	0.124 (0.108, 0.142)	0.130 (0.114, 0.149)	0.95	0.3404
	0.602	0.111 (0.096, 0.128)	0.116 (0.101, 0.133)	0.96	0.4565
	0.932	0.096 (0.083, 0.110)	0.097 (0.085, 0.111)	0.99	0.7692
	1.57	0.095 (0.083, 0.108)	0.101 (0.089, 0.114)	0.94	0.3543
	sum	0.467 (0.407, 0.535)	0.488 (0.429, 0.555)	0.96	0.4490
ultrafine particulate (mg/run)	0.007	4.51 × 10–5 (3.73 × 10–5, 5.44 × 10–5)	5.13 × 10–5 (4.40 × 10–5, 5.98 × 10–5)	0.88	0.1455
	0.027	6.72 × 10–5 (5.88 × 10–5, 7.70 × 10–5)	7.19 × 10–5 (6.26 × 10–5, 8.28 × 10–5)	0.93	0.3535
	0.054	2.45 × 10–4 (2.16 × 10–4, 2.78 × 10–4)	2.66 × 10–4 (2.34 × 10–4, 3.04 × 10–4)	0.92	0.1484
	sum	3.63 × 10–4 (3.19 × 10–4, 4.13 × 10–4)	3.94 × 10–4 (3.45 × 10–4, 4.50 × 10–4)	0.92	0.1830

^a95% CI = 95% confidence interval.

^bThe two highest fine particulate cut points were ignored because the mass of particulate matter at each was negligibly small.

^cTP = true profile; SM = smoothed profile.

^dCharger OFF. Sample sizes: Fine Particulate Mass = 144, using all profiles; Ultrafine Particulate Mass = 144, using all profiles.

^eCharger ON. Sample sizes: Fine Particulate Mass = 144, using all profiles; Ultrafine Particulate Mass = 144, using all profiles.

^*Significant at p ≤ 0.05 level.