Authors' reply

BMJ 1995; 310 doi: https://doi.org/10.1136/bmj.310.6975.329c (Published 04 February 1995) Cite this as: BMJ 1995;310:329
  1. Mark A Mullee,
  2. Steven A Julious
  1. Senior statistical programmer Statistician Medical Statistics and Computing, University of Southampton, Southampton General Hospital, Southampton SO16 6YD

    EDITOR,—C R Charig states that the reason why open surgery has a higher success rate for both small and large stones but a poorer success rate overall when compared with percutaneous nephrolithotomy is the numbers in each group. This, however, does not seem to be the case. Substantially more patients having open surgey had large stones, and as the size of the stones is the most important factor in determining success rates it was probably this difference that gave …

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