Table 7.
Descriptive statistics for measures of connected speech for control children, confirmed cases of persistent speech sound disorder, and potential cases who did not reach criteria for case status.
| Group | n | PCC late 8
a
|
PCC-A
b
|
||
|---|---|---|---|---|---|
| M (SD) | Range | M (SD) | Range | ||
| Controls | 47 | 96.7 (4.0) | 85.2–100.0 | 98.1 (1.7) | 94.7–100.0 |
| Confirmed cases of persistent speech sound disorder (<1.2 SD below the mean on both PCC late 8 and PCC-A) | 263 | 70.5 (15.5) | 24.1–93.2 | 87.8 (7.0) | 42.1–96.4 |
| Potential cases who did not reach criteria for case status (≥1.2 SD below the mean on either PCC late 8 or PCC-A) | 141 | 95.4 (4.2) | 71.7–100.0 | 97.0 (2.3) | 87.3–100.0 |
Note. PCC = percentage consonants correct.
a
The eight consonants that are acquired last in a typical developmental sequence (/s, z, ʃ, ʒ, θ, ð, ɹ, and l/).
b
The percentage of consonants correctly produced, excluding common clinical distortions (Shriberg, 1993).