Reference	Technology/intervention	Comparator
Tucker et al. [38]	geko™	Contralateral leg
Jawad (cardiac) [39]	geko™	No mechanical device at baseline measure
Jawad (coagulation) [35]	geko™	No mechanical device
Williams et al. [40]	geko™	Baseline measure and IPC
Jawad et al. (vs. IPC) [36]	geko™	Baseline measure and IPC
Warwick et al. [63]	geko™	Plaster cast
Williams et al. (unpublished) [37]	geko™	Baseline measure and IPC
Corley et al. [64]	NMES	No mechanical device
Czyrny et al. [65]	NMES	IPC
Faghri et al. [66]	NMES	IPC
Lindstrom et al. [45]	NMES	Pharmacological prophylaxis or no mechanical device
Rosenberg et al. [50]	NMES	Pharmacological prophylaxis or no mechanical device
Velmahos et al. [47]	NMES	No mechanical device
Broderick et al. [67]	NMES	No mechanical device in contralateral leg
Broderick et al. [68]	NMES	Contralateral leg
Browse and Negus [49]	NMES	No mechanical device in contralateral leg
Griffin et al. [69]	NMES	No mechanical device at baseline measure
Izumi et al. [70]	NMES	IPC, electrical muscle stimulation, and patient’s movements in a variety of positions
Kaplan et al. [71]	NMES	No mechanical device in contralateral leg
Nicolaides et al. [46]	NMES	No mechanical device
Nicolaides et al. [72]	IPC and NMES	Pharmacological prophylaxis
Pitto and Young [77]	IPC	Pharmacological prophylaxis
Santori et al. [73]	FID	Pharmacological prophylaxis
Sobieraj-Teague et al. [74]	IPC	Standard VTE prophylaxis care
Warwick et al. [75]	FID	Pharmacological prophylaxis
Kurtoglu et al. [76]	IPC	No mechanical device
Pitto and Young [77]	IPC	Stockings and no mechanical device

FID foot impulse device, IPC intermittent pneumatic compression, NMES neuromuscular electrical stimulation, VTE venous thromboembolism