TY  - JOUR
T1  - ERcp or laparoscopic exploration for the treatment of suspected choledocholithiasis?—reply
AU  - Rogers SJ, Cello JP
Y1  - 2010/08/01
N1  - 10.1001/archsurg.2010.129
JO  - Archives of Surgery
SP  - 796
EP  - 796
VL  - 145
IS  - 8
N2  - 
We read the comments of Singh et al with interest. As we mentioned in our response to the letter from Drs Yashimski and Poulose, we did perform an a priori power sample size calculation in the approved protocol design of the study. Although we had proposed 4 individual primary end points for the study, we chose length of stay as the end point upon which to calculate sample size. Our calculations estimated that we would need a sample of 100 patients per group. We decided to close the study, however, following 6 years of randomization. There is indeed a possibility of a type II error as mentioned in our response to the letter of Drs Yashimski and Poulose.

SN  - 0004-0010
M3  - doi: 10.1001/archsurg.2010.129
UR  - http://dx.doi.org/10.1001/archsurg.2010.129
ER  -