Pre- and peri-operative clinical information, physiological observations and outcome measures following flexible ureterorenoscopy (FURS), for the treatment of kidney stones. A single-centre observational clinical pilot-study in 51 patients

Table 1 Approach for Interpreting the Size of a Correlation Coefficient

Size of Correlation		Interpretation
Positive	Negative	Interpretation
0.90 to 1.00	− 0.90 to − 1.00	Very high positive (or negative) correlation
0.70 to 0.90	− 0.70 to − 0.90	High positive (or negative) correlation
0.50 to 0.70	− 0.50 to − 0.70	Moderate positive (or negative) correlation
0.30 to 0.50	− 0.30 to − 0.50	Low positive (or negative) correlation
0.00 to 0.30	0.00 to − 0.30	negligible correlation

ISSN: 1471-2490