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Table 3 Results of the comparisons of the mean values of the operation time depending on various variables and their characteristic values

From: Allogeneic versus autogenous shell technique augmentation procedures: a prospective-observational clinical trial comparing surgical time and complication rates

Variable

 

Number

Mean (min)

SD (min)

p-value

Gender

Male

34

77.26

25.1

0.454

 

Female

83

82.48

37.1

 

Experience

 < 2 years

13

130.92

48.7

< 0.001

 

 > 5 years

104

74.72

26

 

Donor site

None

67

68.2

24.8

< 0.001

 

Same site

37

94.2

38.5

 
 

Opposite site

13

109

32.8

 

Shell

Autologous

52

91.2

36.5

< 0.001

 

Allogenic

60

69

24.7

 
 

Both

5

119.2

47.8

 

Particles

Autologous

66

81.1

38.1

0.964

 

Mixed

51

80.8

28.3

 

Simultaneous implant

No

115

81.2

34.3

0.648

 

Yes

2

70

14.1

 

Simultaneous sinus lift

No

88

73.8

30.7

< 0.001

 

Yes

29

102.7

35.2

 

Intraoperative complications

No

104

77.8

32.8

0.004

 

Yes

12

106.2

34.5

 

Postoperative complications

No

102

79.3

33.2

0.157

 

Yes

15

92.6

38.6

 

Number shells

1

18

55.7

33.2

< 0.001

 

2

51

76.7

24

 
 

3

29

85.3

36.5

 
 

 > 3

19

109.8

33.9

 
  1. In this model (with all factors), the R-squared was 0.733