Table 3: Perceptual speech ratings for the six patients with and without palatal lift appliance (PLA).

Patient Trial Rater 1 Rater 2 Rater 3
With PLA Without PLA With PLA Without PLA With PLA Without PLA
1 Trial 1 1 3 1 3 1 3
Trial 2 2 3 1 3 1 3
2 Trial 1 1 3 2 3 1 4
Trial 2 1 3 1 3 1 4
3 Trial 1 1 3 1 3 1 3
Trial 2 1 4 1 3 1 3
4 Trial 1 1 4 1 4 1 4
Trial 2 1 4 1 3 1 4
5 Trial 1 1 4 1 4 1 3
Trial 2 1 4 1 4 2 3
6 Trial 1 2 4 1 4 2 4
Trial 2 2 4 1 4 2 4

Absence of hypernasality (1), mild hypernasality (2), moderate hypernasality (3), and severe hypernasality (4).