Table 2.

The number of silicone oil droplets before and after fluid-air exchange or passive drainage.

	FA exchange			PD			P ‡	P §
	Before	After	P †	Before	After	P †
Number of droplets	1.17 × 106 ± 0.83 × 106	0.61 × 106 ± 0.56 × 106	0.012	1.58 × 106 ± 2.64 × 106	0.63 × 106 ± 0.39 × 106	0.305	1.000	0.280
Number of droplets with a diameter of
1-<2 µm	0.96 × 106 ± 0.70 × 106	0.51 × 106 ± 0.48 × 106	0.016	1.42 × 106 ± 2.59 × 106	0.51 × 106 ± .35 × 106	0.446	1.000	0.280
2-<3 µm	1.34 × 105 ± 0.94 × 105	0.66 × 105 ± 0.49 × 105	0.029	1.03 × 105 ± 0.41 × 105	0.81 × 105 ± 0.39 × 105	<0.001	0.853	0.280
3-<4 µm	4.18 × 104 ± 3.17 × 104	2.02 × 104 ± 1.47 × 104	<0.001	3.26 × 104 ± 1.82 × 104	2.36 × 104 ± 1.23 × 104	0.068	0.912	0.315
4-<5 µm	1.52 × 104 ± 0.93 × 104	0.79 × 104 ± 0.57 × 104	0.003	1.13 × 104 ± 0.52 × 104	0.81 × 104 ± 0.57 × 104	0.003	0.631	1.000
5-<7 µm	1.23 × 104 ± 1.31 × 104	0.62 × 104 ± 0.53 × 104	<0.001	0.81 × 104 ± 0.36 × 104	0.58 × 104 ± 0.40 × 104	0.007	0.853	0.853
7-<12 µm	0.50 × 104 ± 0.56 × 104	0.24 × 104 ± 0.14 × 104	0.004	0.36 × 104 ± .19 × 104	0.20 × 104 ± 0.17 × 104	0.012	0.739	0.353

FA, fluid-air; PD, passive drainage. Values in bold are significant at P < 0.05. ^†P value for within-group comparison of the change in number of droplets. ^‡P value for between-group comparison of number of droplets before performing FA or PD. ^§P value for between-group comparison of number of droplets after performing FA or PD.