What do systematic reviews say?

Intervention not reported

• Heated insufflation with or without humidification for laparoscopic abdominal surgery 2016 · Cochrane Headline outcomes only
  no estimate extracted
  7 studies · 285 participants
  Low

Intervention not reported

• Heated insufflation with or without humidification for laparoscopic abdominal surgery 2016 · Cochrane Headline outcomes only
  no estimate extracted
  10 studies · 653 participants
  Moderate

Intervention not reported

• Heated insufflation with or without humidification for laparoscopic abdominal surgery 2016 · Cochrane Headline outcomes only
  no estimate extracted
  8 studies · 561 participants
  Moderate

Intervention not reported

• Heated insufflation with or without humidification for laparoscopic abdominal surgery 2016 · Cochrane Headline outcomes only
  no estimate extracted
  3 studies · 92 participants
  Moderate

Intervention not reported

• Heated insufflation with or without humidification for laparoscopic abdominal surgery 2016 · Cochrane Headline outcomes only
  no estimate extracted
  8 studies · 545 participants
  Moderate

Intervention not reported

• Heated insufflation with or without humidification for laparoscopic abdominal surgery 2016 · Cochrane Headline outcomes only
  no estimate extracted
  6 studies · 340 participants
  Moderate

Intervention not reported

• Heated insufflation with or without humidification for laparoscopic abdominal surgery 2016 · Cochrane Headline outcomes only
  no estimate extracted
  4 studies · 194 participants
  Moderate

Antibiotics vs placebo or no antibiotic

Antibiotic leads to lower surgical wound infection (SWI) compared with no antibiotic/placebo (high certainty).

• Antimicrobial prophylaxis for colorectal surgery 2014 · Cochrane Headline outcomes only
  RR 0.34 [0.28, 0.41]
  30 studies · 2455 participants
  High

Combined oral and intravenous vs oral or intravenous alone

Combined oral and intravenous leads to lower surgical wound infection: oral + iv versus iv alone compared with oral or intravenous alone (high certainty).

• Antimicrobial prophylaxis for colorectal surgery 2014 · Cochrane Headline outcomes only
  RR 0.55 [0.43, 0.71]
  15 studies · 2929 participants
  High
• Antimicrobial prophylaxis for colorectal surgery 2014 · Cochrane Headline outcomes only
  RR 0.52 [0.35, 0.76]
  9 studies · 1880 participants
  High

Intervention not reported

It is very uncertain whether the intervention changes overall five year survival ‐ Colorectal cancer (very low certainty).

• Workload and surgeon´s specialty for outcome after colorectal cancer surgery 2012 · Cochrane Headline outcomes only
  HR 0.9 [0.84, 0.95]
  2 studies · 36858 participants
  Very low

Intervention not reported

It is very uncertain whether the intervention changes permanent stoma rate ‐ Rectal cancer (very low certainty).

• Workload and surgeon´s specialty for outcome after colorectal cancer surgery 2012 · Cochrane Headline outcomes only
  OR 0.57 [0.35, 0.92]
  2 studies · 7093 participants
  Very low

Intervention not reported

It is very uncertain whether the intervention changes abdominoperineal excision of the rectum rate ‐ Rectal cancer (very low certainty).

• Workload and surgeon´s specialty for outcome after colorectal cancer surgery 2012 · Cochrane Headline outcomes only
  OR 0.55 [0.42, 0.72]
  1 study · 894 participants
  Very low

Intervention not reported

The intervention may leads to lower overall five year survival ‐ Colorectal cancer (low certainty).

• Workload and surgeon´s specialty for outcome after colorectal cancer surgery 2012 · Cochrane Headline outcomes only
  HR 0.87 [0.82, 0.92]
  2 studies · 15462 participants
  Low

Intervention not reported

The intervention may leads to lower overall five year survival ‐ Colon cancer (low certainty).

• Workload and surgeon´s specialty for outcome after colorectal cancer surgery 2012 · Cochrane Headline outcomes only
  HR 0.84 [0.76, 0.93]
  1 study · 2905 participants
  Low

Intervention not reported

The intervention showed no clear difference in overall five year survival ‐ Rectal cancer (low certainty).

• Workload and surgeon´s specialty for outcome after colorectal cancer surgery 2012 · Cochrane Headline outcomes only
  HR 0.99 [0.86, 1.14]
  1 study · 1903 participants
  Low

Intervention not reported

The intervention showed no clear difference in five year disease specific survival ‐ Colorectal cancer (low certainty).

• Workload and surgeon´s specialty for outcome after colorectal cancer surgery 2012 · Cochrane Headline outcomes only
  HR 0.94 [0.78, 1.13]
  1 study · 1416 participants
  Low

Intervention not reported

It is very uncertain whether the intervention changes inpatient and 30 day mortality ‐ Colon cancer (very low certainty).

• Workload and surgeon´s specialty for outcome after colorectal cancer surgery 2012 · Cochrane Headline outcomes only
  OR 0.79 [0.61, 1.02]
  3 studies · 47584 participants
  Very low

Intervention not reported

The intervention showed no clear difference in inpatient and 30 day mortality ‐ Rectal cancer (low certainty).

• Workload and surgeon´s specialty for outcome after colorectal cancer surgery 2012 · Cochrane Headline outcomes only
  OR 0.79 [0.51, 1.22]
  1 study · 1903 participants
  Low

Intervention not reported

The intervention showed no clear difference in anastomotic leak rate ‐ Colon cancer (low certainty).

• Workload and surgeon´s specialty for outcome after colorectal cancer surgery 2012 · Cochrane Headline outcomes only
  OR 0.66 [0.36, 1.21]
  1 study · 2570 participants
  Low

Intervention not reported

The intervention showed no clear difference in anastomotic leak rate ‐ Rectal cancer (low certainty).

• Workload and surgeon´s specialty for outcome after colorectal cancer surgery 2012 · Cochrane Headline outcomes only
  OR 0.61 [0.29, 1.28]
  1 study · 1929 participants
  Low