Table 3.

Final model for predicting symptomatic recurrence using all stone formers and the subset with CT imaging

PredictorAll Stone Formers (n=2239, C Statistic=0.661)Stone Formers with CT Imaging (n=765, C Statistic=0.687)
Hazard Ratio (95% CI)P ValueHazard Ratio (95% CI)P Value
Age, per decade0.89 (0.84 to 0.94)<0.0010.95 (0.86 to 1.05)0.31
Male sex1.29 (1.09 to 1.52)0.0031.45 (1.07 to 1.97)0.02
White1.32 (0.97 to 1.80)0.071.34 (0.75 to 2.43)0.33
Family history of stones1.57 (1.34 to 1.86)<0.0011.73 (1.26 to 2.37)<0.001
Prior asymptomatic stone on past imaging1.34 (0.99 to 1.81)0.061.46 (0.86 to 2.48)0.16
Prior suspected stone episodea1.93 (1.51 to 2.46)<0.0011.96 (1.26 to 3.05)0.003
Gross hematuria1.08 (0.90 to 1.29)0.421.43 (1.02 to 1.99)0.04
Any nonobstructing stone1.66 (1.41 to 1.94)<0.0012.07 (1.54 to 2.77)<0.001
Symptomatic pelvic or lower-pole stone2.02 (1.67 to 2.45)<0.0011.69 (1.17 to 2.45)0.006
Symptomatic ureterovesicular junction stone0.87 (0.73 to 1.04)0.120.93 (0.69 to 1.26)0.64
Any known uric acid composition2.37 (1.60 to 3.50)<0.0013.15 (1.43 to 6.92)0.004
  • CI, confidence interval.

  • a Characteristic renal colic attributed to a stone but no stone seen on imaging or voided.