Time Interval

Group P

Group PN

Mean ± SD

Mean ± SD

Baseline

92.40 ± 2.54

93.73 ± 4.00

Post Premedication

72.65 ± 9.54

75.82 ± 5.65

Post induction

38.30 ± 4.92

38.77 ± 3.01

At Pin Fixation

51.63 ± 3.22

52.3 ± 4.80

T15

50.35 ± 2.47

52.18 ± 4.13

T30

52.45 ± 2.14

52.55 ± 2.65

T45

54.50 ± 2.82*

50.27 ± 4.87*

T60

53.70 ± 2.98

53.41 ± 3.54

T75

53.18 ± 3.24

51.69 ± 1.18

T90

55.20 ± 3.85*

50.32 ± 5.04*

T105

53.05 ± 4.29

52.67 ± 2.48

T120

57.10 ± 3.78

56.2 ± 3.27

T135

55.20 ± 3.04

53.55 ± 2.86

T150

58.50 ± 0.71

58 ± 1.1

T165

52.68 ± 4.03

52.95 ± 2.14

T180

56.10 ± 2.99

56.09 ± 2.73

T195

54.64 ± 4.20

53 ± 3.34

T210

55.05 ± 4.35*

56.14 ± 4.90*

T15-T210 denotes the interval of time following pin fixation
*S: Significant difference (p<0.01)
Table 3: Comparison of Mean BIS values at different time intervals between two groups.