Table 3

Percentage points of the χ2 distribution produced on a spreadsheet

χ2 values for the probabilities (P)

Degrees of freedom
 0.1
 0.05
 0.01
 0.001
1
 2.71
 3.84
 6.63
 10.83
2
 4.61
 5.99
 9.21
 13.82
3
 6.25
 7.81
 11.34
 16.27
4
 7.78
 9.49
 13.28
 18.47
5
 9.24
 11.07
 15.09
 20.52
6
 10.64
 12.59
 16.81
 22.46
7
 12.02
 14.07
 18.48
 24.32
8
 13.36
 15.51
 20.09
 26.12
9
 14.68
 16.92
 21.67
 27.88
10
 15.99
 18.31
 23.21
 29.59
11
 17.28
 19.68
 24.72
 31.26
12
 18.55
 21.03
 26.22
 32.91
13
 19.81
 22.36
 27.69
 34.53
14
 21.06
 23.68
 29.14
 36.12
15
 22.31
 25.00
 30.58
 37.70
16
 23.54
 26.30
 32.00
 39.25
17
 24.77
 27.59
 33.41
 40.79
18
 25.99
 28.87
 34.81
 42.31
19
 27.20
 30.14
 36.19
 43.82
20
 28.41
 31.41
 37.57
 45.31
25
 34.38
 37.65
 44.31
 52.62

Bewick et al. Critical Care 2004 8:46   doi:10.1186/cc2428