Table 1.

PICOS criteria for inclusion in the systematic review

Acronym	Definition	Application of the criteria on the present study
P	Participants	Adults with three-part and four-part proximal humeral fractures with traumatic origin
I	Intervention	Conservative treatment
C	Control	None
O	Outcomes	Constant score, complications, range of movement
S	Study design	Studies published between 2000–2019, with levels I–IV, patients older than 18 years, at least 15 patients, minimum follow-up 1 year, studies using a fracture classification system (Neer or AO)