Table 2.

Reported characteristics of study samples abstracted from inclusion and exclusion criteria or sample descriptions

Author	Excludes multiparous	Excludes induced labour	Excludes for BMI	Excludes multiples	Excludes prior caesarean
Bailey et al30	No	No	No	Yes	No
Barry et al31	No	Yes	>30	Yes	n.d.
Benfield et al32	No	n.d.	n.d.	n.d.	n.d.
Bovbjerg et al33	No	n.d.	n.d.	Yes	No
Cluett et al34	Yes	Yes	n.d.	n.d.	n.d.
da Silva et al35	Yes	n.d.	n.d.	Yes	n.d.
Eckert et al36	No	No	n.d.	Yes	n.d.
Geisbuehler et al38	No	n.d.	n.d.	n.d.	n.d.
Geisbuehler et al39	No	n.d.	>40	n.d.	n.d.
Geisbuehler et al37	No	n.d.	n.d.	n.d.	n.d.
Haslinger et al40	No	n.d.	n.d.	Yes	n.d.
Henderson et al41	No	No	n.d.	n.d.	No
Hodgson et al42	No	n.d.	n.d.	Yes	n.d.
Jacoby et al43	No	Yes	n.d.	Yes	n.d.
Lathrop et al44	No	n.d.	n.d.	Yes	n.d.
Lim et al45	No	n.d.	n.d.	Yes	No
Liu et al46	Yes	n.d.	No	Yes	Yes
Mallen-Perez et al47	n.d.	Yes	No	Yes	n.d.
Menakaya et al48	No	Yes	n.d.	Yes	n.d.
Mollamahmutoglu et al49	No	No	No	n.d.	Yes
Neiman et al50	No	Yes	n.d.	Yes	Yes
Ohlsson et al51	No	n.d.	n.d.	Yes	n.d.
Otigbah et al52	No	No	n.d.	n.d.	n.d.
Pagano et al13	Yes	n.d.	n.d.	n.d.	n.d.
Peacock et al53	No	Yes	n.d.	n.d.	n.d.
Preston et al54	No	Yes	No	n.d.	n.d.
Ros et al55	No	n.d.	n.d.	Yes	Yes
Sert et al56	No	Yes	n.d.	n.d.	Yes
Snapp et al57	No	n.d.	n.d.	n.d.	n.d.
Thoeni et al58	Yes	n.d.	n.d.	Yes	Yes
Torkamani et al59	No	n.d.	n.d.	n.d.	n.d.
Ulfsdottir et al60	No	No	No	n.d.	No
Woodward et al61	No	Yes	n.d.	n.d.	Yes
Zanetti-Dallenbach et al62	No	n.d.	n.d.	Yes	n.d.
Zanetti-Dallenbach et al63	No	n.d.	n.d.	Yes	n.d.
Ziolkowski et al64	n.d.	n.d.	n.d.	n.d.	n.d.

n.d. This item was not described in the paper; it was neither listed as an inclusion/exclusion criteria nor in the description of the sample.

BMI, body mass index.