Table 2.
Descriptive statistics for lutein and zeaxanthin consumption and cognitive measures, Health Care and Nutrition Study 2013/Health and Retirement Study 2014
| Measure | Year | n | Lutein and zeaxanthin quartiles | F | P | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Overall | Q1 | Q2 | Q3 | Q4 | ||||||||||
| Mean | sd | Mean | sd | Mean | sd | Mean | sd | Mean | sd | |||||
| Lutein and zeaxanthin (mg/d) | 2013 | 6390 | 2·44 | 2·32 | 0·74 | 0·23 | 1·48 | 0·22 | 2·38 | 0·31 | 5·46 | 2·88 | 3268·52 | <0·001 |
| Immediate word recall | 2014 | 6390 | 5·62 | 1·66 | 5·34a | 1·61 | 5·52a,b | 1·63 | 5·71b | 1·68 | 5·97 | 1·67 | 40·28 | <0·001 |
| Delayed word recall | 2014 | 6390 | 4·63 | 1·99 | 4·33a | 1·91 | 4·53a,b | 1·96 | 4·71b | 2·01 | 4·99 | 2·02 | 31·39 | <0·001 |
Means adjusted for complex survey design.
a,bMatching superscript letters denote non-significant pairwise comparison.