Table 4.

Model predicting symptomatic recurrence stratified on any nonobstructing stone

PredictorNonobstructing Stone Absent (n=1407; 381 Events)Nonobstructing Stone Present (n=681; 277 Events)P Value
Hazard Ratio (95% CI)P ValueHazard Ratio (95% CI)P Value
Age, per decade0.86 (0.79 to 0.93)<0.0010.93 (0.86 to 1.02)0.110.17
Male sex1.37 (1.09 to 1.71)<0.011.24 (0.96 to 1.59)0.100.59
White1.74 (1.07 to 2.84)0.031.02 (0.68 to 1.52)0.940.07
Family history of stones1.47 (1.18 to 1.82)<0.0011.61 (1.24 to 2.09)<0.0010.54
Prior asymptomatic stone on past imaging0.59 (0.30 to 1.14)0.111.77 (1.24 to 2.53)0.0020.004
Prior suspected stone episodea2.51 (1.80 to 3.51)<0.0011.57 (1.09 to 2.27)0.020.09
Gross hematuria1.21 (0.95 to 1.54)0.120.97 (0.73 to 1.28)0.810.24
Symptomatic pelvic or lower-pole stone2.79 (2.14 to 3.65)<0.0011.56 (1.19 to 2.05)0.001<0.01
Symptomatic ureterovesicular junction stone0.86 (0.69 to 1.08)0.180.87 (0.66 to 1.16)0.350.88
Any known uric acid composition2.28 (1.42 to 3.66)<0.0012.78 (1.34 to 5.76)<0.010.60
  • C statistic=0.670. CI, confidence interval.

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