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. Author manuscript; available in PMC: 2010 Oct 1.
Published in final edited form as: Biomaterials. 2009 Jul 17;30(29):5283–5291. doi: 10.1016/j.biomaterials.2009.06.032

Table 1.

Swelling ratios of microspheres in Fig 7. Q was the ratio of the unswollen mean volume to the swollen mean volume, with volumes calculated from mean diameters.

pH 6.5 pH 7.4
Incubation time (min) 15 105 15 75
Mean unswollen diameter (mm) 8.78±3.83 8.37±3.65 5.51±1.91 4.90±1.66
Mean swollen diameter (mm) 32.41±14.92 16.10±8.99 21.44±9.65 9.36±5.29
Q (swelling ratio) 50.32 7.13 58.98 6.99

Note: differences in mean microsphere diameters were statistically significant except for unswollen microspheres at pH 6.5 (15 vs. 105 min) and pH 7.4 (15 vs. 75 min).