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Table 1 Basic characteristics of the included studies

From: Laparoscopic intersphincteric resection versus an open approach for low rectal cancer: a meta-analysis

Study Year Country Type Patients Age mean ± SD/median (range) BMI mean ± SD/median (range) Pathological stagea T stagea N stagea Mean tumor size mean ± SD/median (range)
     Lap/open Lap Open Lap Open Lap Open Lap Open Lap Open Lap Open
I/II III/IV I/II III/IV T0/1/2 3/4 T0/1/2 3/4 N0 1/2 N0 1/2   
Laurent [24] 2012 Italy RCNT 110/65 64 (22–82) 64 (30–86) 24.4 (17–33) 25.3 (16–35) 76 34 48 17 16 94 9 56 49 61 33 32 NR  
Yamamoto [25] 2011 Japan RCNT 22/22 55 (34–68) 58 (35–69) 21.8 (16.8–26.7) 22.5 (19.3–28.9) 18 4 19 3 NR     NR     2.2 (1.5–3.8) 2.8 (1.1–5.5)
Park [26] 2011 Korea RCNT 130/80 60.9 ± 11.7 59.1 ± 11.4 23.4 ± 3.2 23.3 ± 2.6 76 54 44 36 53 77 46 34 NR     4.0 ± 1.9 4.3 ± 1.8
Chi [18] 2015 China RCNT 89/48 56.8 ± 12.0 55.3 ± 14.9 22.2 ± 4.2 27.6 ± 6.5 36 53 16 32 46 43 26 22 63 26 26 22 3.4 ± 1.1 3.1 ± 1.4
Fujimoto [28] 2010 Japan RCNT 35/19 61 (33–82) 58 (28–67) NR NR 19 14 14 5 22 13 8 11 18 17 10 9 2.7 (1.0–9.0) 3.5 (1.2–7.0)
  1. aUICC classification
  2. SD standard deviation, BMI body mass index, RCNT retrospective comparative non-randomized trial, LAP laparoscopic surgery, Open open surgery