# C. R. Charig et al. 1986. Br Med J (Clin Res Ed) 292: 879–882
# Treatment A: all open procedures
# Treatment B: percutaneous nephrolithotomy
# Question: which treatment is better?
# Pooled data lumping large and small stones together
Treat	Success	Freq
A	Yes	273
A	No	77
B	Yes	289
B	No	61