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Table 1 Comparisons of interest (M denotes main comparisons of interest, s denotes secondary comparisons of interest)

From: CORONIS - International study of caesarean section surgical techniques: the follow-up study

Outcome reference number

Outcome

Bl vs. Sh

Ext vs.-A

Sl vs. Dble

Cl vs. N-Cl

Cat vs. P910

Women’s health and mortality

1 i)

Pelvic pain

s

s

s

M

s

 ii)

Dysmenorrhoea

s

s

s

s

s

 iii)

Deep dyspareunia

s

s

s

M

s

 iv)

Urinary symptoms

s

s

s

s

s

2

Diagnostic laparoscopy or diagnostic laparotomy - not related to pregnancy

s

s

s

M

s

3

Hysterectomy or tubal/ovarian surgery - not related to pregnancy

s

s

s

M

s

4

Bladder or bowel damage – not related to pregnancy

s

s

s

M

s

5 i)

Abdominal hernias

M

  

s

 

 ii)

Bowel obstruction

s

s

s

M

s

6

Woman’s death

 

s

M

s

M

Reproductive status

     

7 i)

Women with no subsequent pregnancy – voluntary

s

  

s

 

 ii)

Women with no subsequent pregnancy – involuntary

s

M

s

M

s

8

Fertility treatments

s

M

s

M

s

Subsequent pregnancies

9

Any subsequent pregnancy

s

s

s

s

s

 i)

Interpregnancy interval

s

s

s

s

s

 ii)

Miscarriage

 

s

s

 

s

 iii)

Ectopic pregnancy

 

M

s

M

s

 iv)

Gestation

 

s

s

 

s

 v)

Stillbirth

 

s

M

 

M

 vi)

Neonatal death

 

s

M

 

M

 vii)

Mode of delivery

 

s

M

 

M

 viii)

Other pregnancy complications (composite of a-i)

 

s

M

 

M

  a

Uterine rupture

 

s

M

 

M

  b

Uterine scar dehiscence

 

s

M

 

M

  c

Placenta praevia

 

s

M

 

M

  d

Morbidly adherent placenta

 

s

M

 

M

  e

Abruption

 

s

M

 

M

  f

Postpartum haemorrhage requiring transfusion of >1 unit of whole blood or packed cells

 

s

M

 

M

  g

Severe infection within 6 weeks postpartum

 

s

M

 

M

  h

Hysterectomy up to 6 weeks postpartum

 

s

M

 

M

  i

Manual removal of placenta

 

s

M

 

M

 ix)

Bladder or bowel damage –at the time of subsequent Caesarean section

s

s

s

s

s

CORONIS children – morbidity and mortality

10

Death or serious morbidity of CORONIS child

M

    
  1. Key: Bl vs. Sh = Blunt versus sharp abdominal entry, Ext vs. I-A = Exteriorisation of the uterus for repair versus intra-abdominal repair, Sl vs. Dble = Single versus double layer closure of the uterus, Cl vs. N-Cl = Closure versus non-closure of the peritoneum (pelvic and parietal), Cat vs. P910 = Chromic catgut versus Polyglactin-910 for uterine repair.