Material

Microsphere Diameter µm

Relative Diameters

95% CI, P-value

Mean

+SD

OP

0.51

0.13

OP < OA

−670, −530 < 0.001

OA

1.11

0.33

OP < POR

−262, −188 < 0.001

POR

0.74

0.14

OA > POR

−303, −446 < 0.001