Preoperative hemoglobin and perioperative blood transfusion in major head and neck surgery: a systematic review and meta-analysis

Table 1 Summary of the study and demographic variables of the included studies

Author	Year	n	Male n (%)^a	Age ≥ 60 n (%)^a	Osseous flap n (%)^a	Low Hgb n (%)	PBT n (%)	Anemia/low Hgb Males (g/dL)	Anemia/low Hgb Females (g/dL)	PBT trigger (g/L)
Shah	2010	585	309 (67)	308 (53)	105 (18)	160 (27)	144 (25)	≤ 130	≤ 120
Perisanidis	2013	142	104 (73)	45 (32)	41 (29)	66 (46)	121 (85)	≤ 120	≤ 120
Abu-Ghanem^b	2015	65	44 (68)	40 (62)		18 (28)	14 (22)	≤130	≤ 120
Danan	2015	167	114 (68)		29 (17)		137 (82)			100
Nguyen^b	2018	64				37 (55)	19 (28)	< 130	< 120	70
Rogers^b,d	2019	99	61 (62)	63 (64)	36 (36)	16 (19)^d	26 (26)	< 130	< 120	80–90
Sato^c	2019	69	42 (61)		25 (36)		13 (19)

All included studies were retrospective cohort studies
^an – No. Male = No. Female; n – No. Age ≥ 60 = No. Age < 60; n – No. Osseous flap = No. Soft tissue flap
^bAuthors provided additional data upon contact
^cConference proceeding
^dHemoglobin data was available for 85 patients

ISSN: 1916-0216