Table 3 Mean scores and standard deviations for the cognitive measures.
| Variables | Group | p Value | |||||
|---|---|---|---|---|---|---|---|
| Controls (n = 45) | PKU off diet (n = 25) | PKU on diet* (n = 25) | |||||
| Mean | (SD) | Mean | (SD) | Mean | (SD) | ||
| n‐back percentage accuracy | ** | ||||||
| 0‐back | 98.01 | (1.52) | 97.08 | (2.46) | 98.83 | (1.09) | |
| 1‐back | 97.13 | (2.34) | 95.65 | (3.24) | 97.78 | (1.53) | |
| 2‐back | 86.51 | (7.95) | 84.55 | (7.62) | 88.93 | (5.69) | |
| n‐back speed per item (s) | ** | ||||||
| 0‐back | 0.39 | (0.04) | 0.43 | (0.05) | 0.45 | (0.08) | |
| 1‐back | 0.50 | (0.13) | 0.60 | (0.15) | 0.55 | (0.13) | |
| 2‐back | 1.01 | (0.43) | 1.54 | (1.17) | 1.34 | (0.67) | |
| Flanker percentage accuracy | |||||||
| Compatible trials | 99.28 | (1.59) | 98 | (1.57) | 99.35 | (1.03) | |
| Incompatible trials | 97.22 | (2.82) | 97.05 | (2.28) | 97.65 | (3.41) | |
| Flanker speed per item (s) | ** | ||||||
| Compatible trials | 0.43 | (0.06) | 0.49 | (0.07) | 0.45 | (0.06) | |
| Incompatible trials | 0.46 | (0.06) | 0.52 | (0.08) | 0.47 | (0.05) | |
| Object alternation | |||||||
| 10 consecutive correct trials (%) | 51 | 28 | 48 | ||||
| Percentage of trials correct | 66.04 | (16.14) | 60.24 | (17.75) | 66.48 | (15.75) | |
| Speed per item in s | 0.76 | (0.4) | 0.92 | (0.35) | 0.88 | (0.3) | |
| Perceptual judgement percentage accuracy | |||||||
| Shape matching | 98.6 | (2.02) | 98.2 | (2.84) | 99.4 | (1.66) | |
| Function matching | 98 | (2.61) | 97 | (5.95) | 97.4 | (3.85) | |
| Perceptual judgement speed per item (s) | |||||||
| Shape matching | 0.82 | (0.26) | 0.87 | (0.2) | 0.99 | (0.35) | |
| Function matching | 1 | (0.32) | 0.98 | (0.24) | 1.13 | (0.34) | |