Table 1.

P-values corresponding to a G-test of independence between the variables Q5, Q7, Q8, …Q13 and the demographic variables Q1, …, Q4.

	Q1. What is your subspecialty?	Q2. What is your geographical area?	Q3. Years of experience in Pediatric Urology	Q4. How many cases of hydronephrosis you manage in a typical week?
Q5. When you deal with a case of hydronephrosis, which is your favorite classification system?	0.05201	0.00000007	0.3287	1.955e-06
Q7. Why do you prefer the system you use? (you can choose more than one)	0.4818	0.07535	0.7218	0.2789
Q8. What are the shortcomings of the system you use? (you can choose more than one)	0.9644	0.3354	0.6167	0.6515
Q9. Do you have direct communication with your radiology report providers?	0.3372	0.001802	0.1221	0.1835
Q10. If yes, how often?	0.4125	0.00004	0.938	0.257
Q11. Which is the most frequently used classification system you see in your practice (the one most used by your providers)? (you can choose more than one)	0.9974	0.0000005	0.2386	0.0004758
Q12. Did you attempt to build a common language for description of hydronephrosis among your own team?	0.1706	0.001403	0.008423	0.4134
Q13. Are you available to change your preference in case the majority of Pediatric Urologist prefers another grading system?	0.586	0.1987	0.0403	0.6104

We see that the responses to question Q5 depend on the demographic variables Q2 and Q4. Q9 is dependent on Q2. Q10 depends on Q2. The answers to Q11 depend on Q2 and Q4 while the answers to Q12 are associated with Q2 and Q3. Finally, the categories taken by Q13 depends on the categories taken by Q3. Bolded P values < 0.005..