Block onset time was shorter in the subparaneural group than in the extraneural group ( @ -LSB- @-@ -RSB- minutes ; mean -LSB- @ % confidence interval -RSB- , @ -LSB- @-@ @ -RSB- minutes and @ -LSB- @-@ -RSB- minutes ; mean -LSB- @ % confidence interval -RSB- @ -LSB- @-@ @ -RSB- minutes , respectively ; P = @ ) .