R/T reported	Cell salvage (intervention) (PPR)			No cell salvage (control) (PPR)			Cell salvage (intervention)(PPT)			No cell salvage (control) (PPT)
		Mean	SD	N	Mean	SD	N	Mean	SD	N	Mean	SD	N
Adalberth 1998	T	0.75	1.12	24	0.88	1.29	25	2.25	0.48	8	2.20	1.09	10
Altinel 2007	R	1.00	1.16	16	2.29	1.26	16
Atay 2010	R	0.40	0.84	37	1.17	1.31	40	1.49	1.00	10	2.04	1.09	23
Axford 1994	R	2.00	2.07	16	3.30	2.48	16	3.20	1.69	10	3.77	2.27	14
Blatsoukas 2010 ALL	R	0.85	0.92	163	1.74	1.04	85	1.41	0.78	99	2.21	0.56	67
Blatsoukas 2010 SUBGROUP both	R	0.81	0.88	92	1.74	1.04	43	1.31	0.78	57	2.20	0.58	34
Blatsoukas 2010 SUBGROUP post‐op only	R	0.91	0.97	71	1.74	1.04	42	1.54	0.78	42	2.21	0.56	33
Clagett 1999	R	2.10	2.12	50	2.30	2.12	50	3.18	1.83	33	3.19	1.83	36
Dalrymple‐Hay 1999	R	0.99	1.23	56	1.69	1.23	56	1.98	1.03	28	2.06	1.04	46
Davies 1987	R	4.00	3.47	25	5.50	5.92	25
Djurasovic 2018	R	0.79	1.31	48	1.10	1.21	47	2.37	1.19	16	1.78	1.08	29
Ekback 1995	R	1.90	1.60	15	2.70	1.20	15
Elawad 1991	T	0.22	0.60	19	1.37	1.54	20	0.69	0.92	6	2.73	0.93	10
Eng 1990	T	1.20	0.85	20	1.70	1.05	20	1.41	0.73	17	2.00	0.81	17
Gäbel 2013a	R	1.30	1.97	15	0.10	0.41	15	3.25	1.80	6	0.75	1.19	2
Goel 2007	R	1.54	6.01	24	2.40	6.58	25	1.85	6.56	20	2.40	6.58	25
Heddle 1992	R	0.40	0.81	39	1.20	1.01	40	1.56	0.87	10	1.78	0.69	27
Horstmann 2012	T	0.08	0.40	50	0.16	0.55	50	2.00	0.00	2	2.00	0.00	4
Horstmann 2013	T	0.08	0.39	102	0.18	0.57	102	2.00	0.00	4	2.00	0.00	9
Kelley‐Patteson 1993	T	0.28	0.69	18	0.17	0.54	18	1.67	0.82	3	1.50	1.00	2
Khan 2017 (SALVO)	T	0.05	0.50	665	0.07	0.62	684	2.92	2.43	12	3.33	2.62	15
Kirkos 2006	R	0.54	0.87	78	1.63	1.51	77
Koopman‐van Gemert 1993a	R	4.90	3.50	17	6.20	6.16	20	5.55	3.19	15	6.20	6.16	20
Koopman‐Van Gemert 1993b	R	0.30	0.81	29	1.10	1.42	30	1.74	1.23	5	2.54	0.97	13
Lepore 1989	R	2.70	2.82	67	3.30	2.72	68	3.62	2.71	50	3.62	2.64	62
Martin 2000	T	0.99	0.94	98	1.61	1.01	100	1.80	0.36	54	2.20	0.26	73
Murphy 2005	T	0.23	0.63	30	0.35	0.86	31	1.75	0.54	4	1.57	1.22	7
Nemani 2019	R	0.57	0.91	30	0.78	0.83	33
Niranjan 2006 ‐ all	R	0.53	0.66	40	1.38	1.33	40
Niranjan 2006 ‐ SUBGROUP on CPB	R	0.60	0.73	20	1.98	1.50	20
Niranjan 2006 ‐ SUBGROUP off CPB	R	0.47	0.63	20	0.77	0.82	20
Page 1989	R	3.15	2.07	48	3.83	2.61	51	3.60	1.81	42	4.34	2.33	45
Parrot 1991 ‐ ALL	T	1.30	1.05	44	4.50	0.89	22	1.79	0.81	32	4.50	0.89	22
Parrot 1991 SUBGROUP intra‐op only	T	1.88	0.98	22	4.50	0.91	11	2.18	0.68	19	4.50	0.91	11
Parrot 1991 SUBGROUP both	T	0.82	0.90	22	4.50	0.91	11	1.38	0.76	13	4.50	0.91	11
Savvidou 2009	R	0.58	0.69	25	3.03	0.83	25
Schaff 1978	R	2.40	2.40	63	4.80	4.32	51
Schönberger 1993	R	0.10	1.37	20	0.60	1.37	20	2.00	0.00	1	3.00	1.54	4
Shen 2016	R	2.11	2.69	53	5.40	3.52	50	5.08	1.42	22	6.92	2.26	39
Shirvani 1991	R	4.11	2.84	21	4.06	1.56	21	4.32	2.74	20	4.06	1.56	21
So‐Osman 2006	T	1.10	1.34	47	0.86	1.08	22	2.36	0.94	22	1.90	0.74	10
So‐Osman 2014	R	0.34	1.37	1481	0.28	1.04	961	2.72	2.98	183	2.65	1.96	103
Tripkovic 2008	R	0.22	1.00	30	1.74	1.17	30	1.65	2.54	4	2.18	0.86	24
Unsworth 1996	T	2.49	1.79	71	2.74	1.52	34	2.81	1.66	63	3.00	1.31	31
Vermeijden 2015	R	2.00	3.50	364	2.30	3.00	352	4.21	4.07	173	3.91	3.01	207
Xie 2015	R	2.01	2.77	72	5.39	3.30	69	5.36	1.52	27	7.15	1.31	52
Zhang 2008	T	0.36	0.38	20	1.04	0.57	20	0.72	0.14	10	1.30	0.23	16
Zhao 1996	R	3.60	2.46	22	5.90	3.57	20
Zhao 2003	T	0.76	0.63	30	2.22	0.41	30	1.20	0.27	19	2.22	0.41	30
Zhao 2017	R	2.47	0.80	60	4.07	0.98	60