Table 2. Mean Operating Time Spent During Laparoscopic Appendectomy for Complicated Grades of Acute Appendicitis From Four Similar Studies (n = 154) .

Study or subgroup	Mean*	SD#	n§
Katsuno et al (2009) [17]	116.7	45	141
Lin et al (2006) [18]	96.1	43.1	99
So et al (2002) [19]	73	25	85
Khalili et al (1999) [20]	86	29	122
µGomes et al (2012)	69.4	26.3	154

^*Mean operating time in minutes. ^#Standard deviation. ^§Sample of each series. ^µAuthor’s series.