N

Observed

Expected

(O-E)^2/E

(O-E)^2/V

stage = I

50

25

39.9

5.573

6.813

stage = II

77

51

63.9

2.606

3.662

stage = III

72

51

54.1

0.174

0.231

stage = IV

68

57

33.2

16.966

20.103

stage = unkn

71

45

37.9

1.346

1.642

Chi sq = 27.2 on 4 degrees of freedom P = 0.00002