The @ to @ mm group had a significantly shorter catheterization time compared with the other @ groups in the log-rank test ( @-@ vs < @ mm group ; P = @ , @-@ vs @ mm group ; P < @ ) , and higher success rate in the first attempt ( < @ -LSB- @ % -RSB- vs @-@ mm -LSB- @ % -RSB- , P = @ ; @-@ -LSB- @ % -RSB- vs @ mm -LSB- @ % -RSB- , P < @ ) , and the overall attempt ( < @ -LSB- @ % -RSB- vs @-@ mm -LSB- @ % -RSB- , P = @ ; @-@ -LSB- @ % -RSB- vs @ mm -LSB- @ % -RSB- , P = @ ) .