The combined 3-year overall survival for all stages was 81.8 % ( 78.4-85 .1 ) in the laparoscopic group and 84.2 % ( 81.1-87 .3 ) in the open-surgery group ( p = 0.45 by log-rank test ) ; the difference in overall survival after 3 years was 2.4 % ( 95 % CI -2.1 to 7.0 ; HR 0.95 [ 0.74-1 .22 ] ) .
