a slight trendP = 0.050
There was only a slight trend in the hazard of retreatment with increasing year (hazard ratio = 1.01, 95% confidence interval 1.0–1.02, P = 0.050).
There was only a slight trend in the hazard of retreatment with increasing year (hazard ratio = 1.01, 95% confidence interval 1.0–1.02, P = 0.050).
Older age, being male, more recent index year, and 2-step PCNL were significantly associated with greater odds of outpatient PCNL, whereas increasing Charlson Comorbidity Index score and having stones in both the kidney and ureter were associated with lower odds; having stones ≤ 2 cm was a marginally significant predictor ( P = 0.051) of greater odds, and variation by region and health plan type was also observed.