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. Author manuscript; available in PMC: 2008 Sep 4.
Published in final edited form as: BJU Int. 2007 Feb 19;99(5):1134–1142. doi: 10.1111/j.1464-410X.2006.06736.x

Table 2.

Pearson correlation coefficients (r-value) were used to assess the degree of closeness of the linear relationship between values before and after SWL. A perfect correlation has a r-value of 1

Measurement Lithotripter N SW number r-value P-value
GFR Duet 10 2400 0.28 0.428
HM3 12 2400 0.78 0.003
HM3 8 4800 0.67 0.071
RPF Duet 10 2400 0.45 0.192
HM3 12 2400 0.87 0.001
HM3 8 4800 0.91 0.002