Table II.

Comparison of Sizing Results for PS Microspheres at Each Threshold Value

Item	Threshold value
	Mean		Mean + 0.5σ		Mean + 1.0σ		Mean + 1.5σ
	Pre	Post	Pre	Post	Pre	Post	Pre	Post
5-μm PS microspheres
Mean (μm)	7.14	6.89	6.30	6.20	5.96	5.18	5.63	4.63
STD (μm)	0.69	5.90	0.58	4.05	0.57	3.42	0.51	2.79
Area (%)	4.44	23.05	3.46	14.51	3.09	10.81	2.76	7.81
Particle number	11	107	11	101	11	106	11	102
Recovery (%)	–	96.5	–	98.4	–	86.9	–	82.2
10-μm PS microspheres
Mean (μm)	11.26	11.11	10.58	10.19	10.15	8.50	9.87	7.39
STD (μm)	0.56	7.14	0.65	5.59	0.61	4.87	0.47	4.12
Area (%)	6.98	19.57	6.18	14.48	5.68	11.53	5.37	8.79
Particle number	7	43	7	41	7	46	7	47
Recovery (%)	–	98.7	–	96.3	–	83.7	–	74.9
15-μm PS microspheres
Mean (μm)	16.51	17.42	15.79	15.90	15.41	12.56	14.99	9.26
STD (μm)	0.26	8.27	0.36	6.80	0.31	7.07	0.32	6.54
Area (%)	8.57	17.33	7.84	13.98	7.46	11.29	7.06	9.32
Particle number	4	18	4	18	4	21	4	28
Recovery (%)	–	105.5	–	100.7	–	81.5	–	61.8

PS polystyrene, STD standard deviation