Degree of

deformities

Absolute value of deformity

The value of the IM angle

Measured value

D1 classification

Applying Formula (22)

D2 classification

Frequency

Percent

Frequency

Percent

Normal condition

≤17.50

2

0.5

3

0.8

Mild deformity

17.51 - 32.70

155

39.1

123

31.1

Moderate deformity

32.71 - 44.70

196

49.5

233

58.8

Severe deformity

More than 44.71

43

10.9

37

9.3

Total

396

100.0

396

100.0