Table 2.

Univariate hazard ratios for recurrence of symptomatic stones

PredictorHazard RatioP Value
Age, per decade0.920.002
Male sex1.150.07
White race1.310.07
Family history of kidney stones1.64<0.001
Body mass index1.010.27
Pregnant1.400.11
Current smoker0.950.45
Prior incidental (asymptomatic) stone on imaging1.530.004
Prior suspected stonea2.27<0.001
Renal colic1.000>0.99
Fever0.970.84
Urinary tract infection1.060.75
Microscopic hematuria0.970.77
Gross hematuria1.290.004
≥2 stones on imaging1.72<0.001
Any nonobstructing stone1.81<0.001
Any obstructing stone1.070.45
Staghorn stone0.590.29
Symptomatic pelvic or lower-pole stone2.34<0.001
Ureteropelvic junction stone1.190.29
Ureter stone1.090.29
Ureterovesicular junction stone0.790.007
Any known uric acid composition2.11<0.001
CKD0.990.97
Hypertension0.940.45
Diabetes mellitus1.140.42
Dyslipidemia1.000.99
Gout0.840.51
Hyperparathyroidism1.070.91
Diarrhea0.970.79
Lower urinary tract symptoms0.880.12
  • Data from n=2239 patients; 707 episodes.

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