Studies

Year

Cranial
(%)

Cervical
(%)

Thoracic
(%)

Lumbosacral
(%)

Hope-Simpson ⁵

1965

15

14.6

53.6

16.8

Nigam P et al ¹⁰

1972

7.4

13.3

73

5.7

Sehgal et al ⁶

1976

8.8

20

52.5

18.8

Chaudhary SD et al ⁷

1987

11.3

19.5

55.2

13.9

Das AL et al ¹¹

1997

9.7

14.5

67.8

8

Dubey AK et al ²

2005

10.28

15.8

54.81

13.08

Present study

2006

18.88

13.33

46.66

21.1