Table 5.
Cognitive test scores of children grouped by quartile of plasma lutein*
(Mean values and standard deviations)
| Quartile of plasma lutein | |||||||
|---|---|---|---|---|---|---|---|
| 1 (n 40) | 2 + 3 (n 80) | 4 (n 40) | |||||
| Mean | sd | Mean | sd | Mean | sd | P | |
| Plasma lutein (µmol/l) | 80·7 | 15·1 | 135 | 23·4 | 237 | 42·8 | |
| PPVT | 114 | 18·3 | 117 | 18·4 | 120 | 18·0 | 0·319 |
| KABC-II | |||||||
| Mental process | 76·9 | 10·7 | 78·1 | 11·3 | 79·7 | 11·6 | 0·556 |
| Sequential process | 21·3 | 4·91 | 21·6 | 4·58 | 22·3 | 3·48 | 0·593 |
| Simultaneous process | 33·7 | 5·81 | 34·8 | 5·16 | 34·8 | 6·19 | 0·580 |
| Learning ability | 21·8 | 4·56 | 21·8 | 5·13 | 22·5 | 5·00 | 0·765 |
PPVT, Peabody Picture Vocabulary Test; KABC-II, Kaufman Assessment Battery.
*
No statistically significant differences were found in test performance between children grouped by quartile of plasma lutein concentration (P > 0·05; ANOVA).