Table 1.

Correlations between number of SO droplets in the first or last washout and UBM total grade or SOI.

Number of droplets with a diameter of (μm)	UBM total grade		SOI
	r value	P value	r value	P value
0.4–<5	0.343	0.047∗	0.358	0.037∗
5–<12	0.160	0.367	0.052	0.771
0.4–<12	0.345	0.046∗	0.342	0.048∗

^∗ P < 0.05 was considered statistically significant.