Table 5.
Spearman correlation coefficients (ρ) and cross-classification for selected fatty acids, n = 49
| Fatty acid | FFQ v. PFD | PFD v. Biomarker | FFQ v. Biomarker | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cross-classification | Cross-classification | Cross-classification | |||||||||||
| time‡ | ρ | 95% CI | ST | OT | ρ | 95% CI | ST | OT | ρ | 95% CI | ST | OT | |
| n-3† | 0 | 0.50* | 0.26, 0.69 | 53 | 10 | 0.19 | −0.09, 0.45 | 35 | 16 | 0.28* | 0.00, 0.52 | 37 | 14 |
| 6 | 0.40* | 0.13, 0.61 | 45 | 14 | |||||||||
| 12 | 0.51* | 0.27, 0.69 | 47 | 8 | 0.56* | 0.33, 0.73 | 57 | 6 | 0.50* | 0.26, 0.69 | 47 | 8 | |
| EPA | 0 | 0.53* | 0.30, 0.71 | 57 | 6 | 0.10 | −0.18, 0.37 | 35 | 16 | 0.30* | 0.02, 0.54 | 45 | 14 |
| 6 | 0.32* | 0.04, 0.55 | 33 | 10 | |||||||||
| 12 | 0.46* | 0.20, 0.65 | 55 | 12 | 0.56* | 0.33, 0.73 | 53 | 6 | 0.38* | 0.11, 0.60 | 41 | 10 | |
| DHA | 0 | 0.51* | 0.27, 0.69 | 59 | 8 | 0.17 | −0.12, 0.43 | 33 | 14 | 0.33* | 0.05, 0.56 | 41 | 14 |
| 6 | 0.38* | 0.11, 0.60 | 59 | 12 | |||||||||
| 12 | 0.48* | 0.23, 0.67 | 47 | 12 | 0.44* | 0.18, 0.64 | 51 | 8 | 0.51* | 0.27, 0.69 | 55 | 8 | |
CI Confidence interval, PFD pre-coded food diary, FFQ food frequency questionnaire
Cross-classification, % classified in ST: same tertile, OT: opposite tertile, grossly misclassified
†n-3: sum n-3 (ALA (18:3n-3), EPA (20:5n-3), DPA (22:5n-3), DHA (22:6n-3)) for biomarker and total n-3 PUFAs for PFD/FFQ
‡time 0: around surgery (FFQ: presurgery, PFD; postsurgery, biomarker; presurgery), time 6: 6 months postsurgery, time 12: 12 months postsurgery
* p<0.05