Table 1.
Participant demographic information and behavioural test results
| Measures | Stuttering | Controls | Difference |
|---|---|---|---|
| n | 27 | 29 | n/a |
| Age in months | 77.1 (26.7) | 76.9 (22.8) | P = 0.979 (n.s.) |
| SSI-4 | 20.5 (7.1) | N/A | n/a |
| % stuttered disfl | 5.7 (4.5) | 0.97 (.82) | P = 0 (significant) |
| % normal disfl | 5.0 (3.0) | 4.3 (2.2) | P = 0.782 (n.s.) |
| PPVT-IV | 109.5 (14.3) | 116.4 (14.9) | P = 1 (n.s.) |
| EVT | 106.5 (13.3) | 114.5 (16.1) | P = 0.653 (n.s.) |
| GFTA | 103.8 (9.2) | 105.0 (8.9) | P = 0.606 (n.s.) |
| Handedness | 74.9 (27.8) | 83.9 (15.7) | P = 0.146 (n.s.) |
| Full IQ | 102.5 (15.8) | 113.9 (15.8) | P = 0.135 (n.s.) |
| Verbal IQ | 102.3 (15.5) | 117.3 (16.7) | P = 0.017 (significant) |
| Performance IQ | 105.3 (14.9) | 112.6 (19.1) | P = 1 (n.s.) |
| Purduea: dominant hand | 9.30 (2.88) | 9.10 (2.74) | P = 1 (n.s.) |
| Purdue: non-dominant hand | 8.44 (2.90) | 8.38 (2.81) | P = 1 (n.s.) |
| Purdue: both hands | 6.70 (2.97) | 7.05 (2.81) | P = 1 (n.s.) |
| SES | 52.6 (8.2) | 53.1 (7.6) | P = 0.817 (n.s.) |
aNumber of pegs completed in 30 s.
SSI-4 = Stuttering Severity Instrument, fourth edition; % stuttered disfl = stuttered words (e.g. sound-syllable repetitions, word repetitions, sound prolongations) occurring per 100 words during conversational speech; % normal disfl = normal disfluencies (e.g. interjections, phrase repetitions) occurring per 100 words during conversational speech; PPVT = Peabody Picture Vocabulary Test; EVT = Expressive Vocabulary Test; GFTA = Goldman-Fristoe Test of Articulation; Purdue = Purdue pegboard test; SES = Hollingshead four-factor index of social status; n.s. = not significant.