Table 3.

Analysis of series regarding reduction in postoperative analgesia and hospital stay

Authors (Year) [Reference]	Total patients	Reduction in postoperative analgesia	Reduction in hospital stay (average in days)
Diaz et al. (2012) [2]	201	Significant	Not significant
Abrishamkr et al. (2011) [3]	66	Not available	Not available
Modi et al. (2009) [4]	57	Not available	Not available
Hackel et al. (2009) [5]	167	Not available	Significant (4.5 vs. 5.2)
Rasmussen et al. (2008) [17]	200	Not available	Significant (6 vs. 8 )
Lotfinia et al. (2007) [18]	150	Not available	Not available
Jirarattanaphchai et al. (2007) [19]	34	Significant	Not available
Lundin et al. (2003) [20]	80	Not available	Significant (1.7 vs. 2.3)
Mirzai et al. (2002) [21]	44	Significant	Not available
Debi et al. (2002) [22]	61	Not available	Not significant
Hurlbert et al. (1999) [23]	60	Significant	Not significant
McNeill et al. (1995) [24]	110	Not significant	Not available
Glasser et al. (1993) [25]	32	Significant	Significant (1.4 vs. 4)
Lavyne et al. (1992) [26]	78	Not significant	Not significant
Davis et al. (1990) [27]	86	Significant	Significant (2.7 vs. 4.4)
Foulkes et al. (1990) [28]	45	Significant	Significant (6.4 vs. 8.7)