Table 7.

Multiple linear regression results for the 240 combinations analysed for log maxminhrp in cohort 1 and cohort 2

Variable (n)	P range cohort 1	P value ≤0.05 cohort 1	% combinations cohort 1	P range cohort 2	P value ≤0.05 cohort 2	% Combinations cohort 2
Age (240)	0.008–0.358	96	40	0.005–0.119	205	85
GFR (240)	0.005–0.075	227	95	0.034–0.285	6	3
LKTBR (120)	<0.001–0.005	120	100	<0.001–0.030	120	100
RKTBR (120)	<0.000–0.033	120	100	<0.001–0.013	120	100
Left renal area (120)	0.238–0.987	0	0	0.381–0.895	0	0
Left background area (120)	0.218–0.998	0	0	0.494–0.999	0	0
Left no cortical defects (120)	0.123–0.992	0	0	0.146–0.976	0	0
Right no cortical defects (120)	0.079–0.903	0	0	0.254–0.994	0	0
Left renal margins smooth (24)	0.032–0.804	4	17	0.383–0.996	0	0
Right renal margins smooth (24)	0.049–0.488	1	4	0.068–0.354	0	0
Both renal margins smooth (24)	0.224–0.920	0	0	0.567–0.995	0	0
Left renal margins irregular (24)	0.088–0.996	0	0	0.383–0.996	0	0
Both renal margins irregular (24)	0.144–0.544	0	0	0.013–0.070	21	88
Left renal margins well defined (24)	<0.001–0.284	12	50	0.424–0.939	0	0
Right renal margins well defined (24)	<0.001–0.138	12	50	0.002–0.129	20	83
Both renal margins well defined (24)	<0.001–0.008	24	100	0.105–0.497	0	0
Time visualisation left calyces (80)	<0.001–0.639	40	50	0.089–0.288	0	0
Time visualisation right calyces (80)	0.012–0.750	40	50	<0.001–0.216	71	89
Time visualisation left pelvis (80)	0.013–0.839	24	30	0.011–0.057	77	96

The number of combinations in which each variable was included is given in brackets. The range of P values and the number of times a variable had a P value ≤0.05 is also listed. The variables with the same number of combinations in cohorts 1 and 2 in which the P value of the beta coefficient was ≤0.05 or >0.05 are presented in bold. The percentage of combinations in which each variable was significant is also given.

GFR, glomerular filtration rateLKTBR, left kidney to background ratio; RKTBR, right kidney to background ratio.