It is noteworthy that in this subgroup with mild hydronephrosis (Group 1, n = 139), the conventional metrics (R and S) failed to reach statistical significance.
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Bridging the gap in PCNL preoperative planning: software-free stone metrics that outperform conventional measures.
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The sentences
The subgroup analysis for hydronephrosis was likely underpowered, particularly in the mild hydronephrosis group, which may explain why conventional metrics (R and S) did not reach statistical significance in that subset despite being significant in the overall cohort.