Table 3: Agreement between VRS and NRS using various cut-off points to obtain their equivalence of mild, moderate and severe pain categories on VRS.

Verbal Rating Scale

Numerical Rating Scale (Serlin et al. cut-off points)

Kappa coefficient

% agreement between VRS and NRS

χ2 ; (df); p-value

 

14 (Mild)

5 - 6 (Moderate)

7-10 (Severe)

 

 

 

 

3.995 (4); 0.407

Mild

43 (84.3%)

7

1

 

 

81.4

Moderate

34

79 (59.8%)

19

0.61

Severe

0

0

53 (100.0%)

 

Numerical Rating Scale (Jessen et al. cut-off points)

 

1-3 (Mild)

4-6 (Moderate)

7-10 (Severe)

 

 

 

Mild

36 (70.6)

14

1

 

 

82.6

 

Moderate

11

102 (77.3)

19

0.69

 

Severe

0

0

53 (100.0)

 

 

Numerical Rating Scale (Paul et al. cut-off points)

 

1-4 (Mild)

5-7 (Moderate)

8-10 (Severe)

 

 

 

Mild

43 (84.3)

7

1

0.64

80.4

 

Moderate

34

95 (72.0)

3

 

 

 

Severe

0

8

45 (84.9)