Variable

Before treatment (%)

After treatment (%)

Overall correct answer

22.4

26.4

Bilabial

23.8

21.5

Dental-alveolar

15.6

31.9

Palato-alveolar

10

8.8

Palatal

37.1

31.4

Velar

3.8

15

Glottal

100

80

Vowels

84

76