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Table 1 Inclusion/exclusion criteria and patient characteristics

From: A systematic review on the effectiveness of implementation strategies to postpone elective caesarean sections to ≥ 39 + (0–6) weeks of gestation

Study Inclusion/Exclusion criteria Patient characteristics Control/Intervention:
Allen 2020 Inclusion criteria:
All births ≥ 37 WG.
Exclusion criteria:
Paid by other than Medicaid or private insurance.
NR
Dunn 2013 Inclusion criteria:
All ERCS ≥ 37 WG in “Low-risk women”.
Exclusion criteria:
Women, who were in labour, had a medical history or pregnancy-related complications.
ERCS n, 459/497
Gurol-Urganci 2014 Inclusion criteria:
All ECS ≥ 37 WG.
Singleton elective caesarean delivery episodes in NHS trusts (which had data for at least 50% of their deliveries in at least 7 years) from 1 April 2000 to 28 February 2009. Included if their HES record contained the code of ECS in any of the core operative procedure fields.
Exclusion criteria:
Women who had an ECS < 34 weeks or a medical history. (e.g., preexisting and gestational diabetes, hypertensive disorders, preeclampsia, eclampsia, premature rupture of membranes, poly- and oligohydramnios, excessive or poor foetal growth, and placenta praevia).
ECS n, 118,456
Hutcheon 2015 Inclusion criteria:
All ECS ≥ 37 WG for a primary indication of breech, repeat CS, or maternal request/vaginal birth after CS declined.
Exclusion criteria:
Pregnancies complicated by diabetes in pregnancy, antepartum haemorrhage, hypertension in pregnancy, or other comorbidities that might be an indication for an earlier delivery.
ECS n, 2021/2518
Maternal age, mean in years (SD):
33.7 (4.6)/34.1 (4.7)
Nulliparous n (%):
352 (17.4)/486 (19.3)
Prepregnancy BMI (kg/m2) n (%):
Underweight (< 18.5), 80 (4.0)/93 (3.7)
Normal weight (18.5–24.9), 872 (43.1)/1050 (41.7)
Overweight (25–29.9), 254 (12.6)/352 (14.0)
Obese (≥ 30), 98 (4.9)/137 (5.4)
Missing, 717 (35.5)/886 (35.2)
WG at delivery median in (days) (range), 271 (268–274)/273 (270–276)
Birthweight mean in g (SD):
3420 (425)/3421 (426)
MacAllister 2019 Inclusion criteria:
All ECS ≥ 37 WG (= absence of labour and no maternal or foetal indication for urgent delivery).
Exclusion criteria:
NR
ECS n, 19,780/40,875
Nicholl 2010 Inclusion criteria:
All ECS ≥ 37 WG for ERCS, breech presentation, or maternal request.
Exclusion criteria:
Medical indication
NR
Nicoll 2004 Inclusion criteria:
All ECS ≥37 WG (= timing of delivery could be postponed without any risk to the mother or foetus)
Exclusion criteria:
NR
ECS n, 292/327
Snowden 2016 Eligibility criteria:
All ECS ≥ 37 WG (= without medical or obstetrical indication).
Exclusion criteria:
Women with a medical history or pregnancy-related complications (e.g., chronic hypertension, prepregnancy diabetes, and gestational diabetes mellitus).
ECS n, 12,204/7,697
Tanger 2010 Inclusion criteria:
All ECS ≥37 WG
Exclusion criteria:
Women with a medical history or pregnancy-related complications (e.g., preeclampsia, maternal infection, (suspicion of) foetal distress, severe birth defects of the foetus, maternal gestational diabetes or diabetes mellitus).
ECS n, 324/486
Maternal age, mean in years (SD):
36.4 (4.7)/34.8 (4.2)
Multiples n (%), 9 (3)/15 (3)
Female n (%), 167 (50)/254 (51)
Birthweight mean in g (SD):
3282 (470)/3386 (494)
Apgar score after 5 min < 6; n (%), 0/0
Yamasato. 2014 Inclusion criteria:
All ECS ≥ 37 WG.
Exclusion criteria:
Medical indication
NR
  1. CS caesarean section, ECS elective caesarean section, ERCS elective repeat caesarean section, WG week of gestation