Study	Reason for exclusion
Aitchison	Trial plan only. No data recorded with this citation (Aitchison).
Akhtar 2014	Babies at term not preterm (Akhtar 2014).
Ashish 2017	Does not fit with the objectives of the review as the authors compared 2 different lengths of delayed cord clamping (≥ 180 seconds versus ≤ 60 seconds) (Ashish 2017).
Chopra 2016	Study includes a different population of babies (≥ 35 weeks who were small for gestational age). Although some preterm babies would be included in this study, the mean gestational age of those providing data was around 37.6 weeks and the study was not stratified by gestational age. In addition, there was a loss of 42% of data.
Frank 1967	This was a non‐randomised study in which delayed cord clamping was defined as that performed after the second breath (Frank 1967).
Garabedian 2016	Not an RCT. A cohort study of a continuous series compared with a historical continuous series (Garabedian 2016).
Ibrahim 2000	Randomised trial with adequate concealment. The intervention consisted of a delay in cord clamping of 20 seconds. Control infants had their cords clamped immediately. The study was excluded for the reason that the intervention group at a cord clamping time of less than 30 seconds. Delay of cord clamping was defined in the protocol for this review to be of at least 30 seconds duration (Ibrahim 2000).
Katheria 2016	The comparison is ventilation during delayed cord clamping (V‐DCC) compared with delayed cord clamping alone (DCC only). DCC was 60 seconds in both groups (Katheria 2016).
Kattwinkel 2016	This study is a comparison of ventilation before or after clamping, either with standard ventilation or CPAP.
Mungkornkaew 2015	Does not fit with the objectives of the review as the authors compared 2 different lengths of delayed cord clamping (2 minutes versus 1 minute) (Mungkornkaew 2015).
Narendra 1998	Abstract only, further details on women and study not available from the authors (Narendra 1998).
Ruangkit 2015	Not an RCT but compared with historical cohort (Ruangkit 2015).
Saigal 1972	Sequential allocation procedure, which is not a randomised trial (Saigal 1972).
Saigal 1977	Sequential allocation procedure, which is not a randomised trial (Saigal 1977).
Spears 1966	Randomisation procedure was unclear. Gestational age of the low birthweight infants was not given (Spears 1966).
Taylor 1963	Inadequate randomisation. Largely term infants. DCC > 1 minute vs ECC < 1 minute quote: "...patients were assigned in rotation..." i.e. quasi randomised so excluded. Also report randomisation of premature infants failed (Taylor 1963).
Tipwaree 2015	Study included women and babies at term only (Tipwaree 2015).
Yadav 2015	Study included women and babies at term only (Yadav 2015).
Yasmeen 2014	Does not fit with the objectives of the review as the authors compared 2 different lengths of delayed cord clamping (≥ 3 minutes versus ≤ 1 minute) (Yasmeen 2014).
Zisovska 2008	Quasi‐RCT reported as quote: "...randomised alteratively..." (Zisovska 2008).

CPAP: continuous positive airway pressure
 DCC: delayed cord clamping
 ECC: early cord clamping
 RCT: randomised controlled trial