Study

No. of patients

% agreement

Persson, 1971

42

86

Gottschalk-Sabag, 1993

47

87

Mallidis,1994

46

94

Craft,1997

19

84

Odabas, 1997

24

90

Mahajan, 1999

60

97

Rammou-Kinia, 1999

30

87

Mcng, 2000

87

94

Qubian, 2000

34

96

Aridogan, 2003

40

90

Mehrotra, 2007

58

94

Present study, 2015

67

91.6