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Table 1 Characteristics of studies included in the meta-analysis

From: Avascular necrosis in proximal humeral fractures in patients treated with operative fixation: a meta-analysis

Study

Country

Ethnicity

Sample size

Study design

Operative approaches

Average age, years

Fan Y, 2012[20]

China

Asian

35

Retrospective

Open reduction and locking plate internal fixation

75.0

Fjalestad T, 2005[5]

Norway

European

51

Retrospective and prospective

AO angular blade plate, screw fixation and cerclage, antegrade screw nails, or retrograde pin fixation

75.0

Ilchmann T, 1998[9]

Sweden

European

24

Retrospective

Tension band wiring fixation

65.2

Kristiansen B, 1988[17]

Denmark

European

24

Prospective

Steinmann pin

69.0

Schai P, 1995[11]

Switzerland

European

93

Retrospective

Minimal internal fixation or plate fixation

67.5

Zyto K, 1995[19]

Sweden

European

35

Retrospective

Open reduction and internal fixation, not in detail

71.0

Zyto K, 1997[18]

Sweden

European

29

Prospective

Tension band wiring fixation

74.0