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Table 4 Spearman correlation coefficients (ρ) between fish/fish products and fatty fish and biomarker, n = 49

From: Validation of repeated self-reported n-3 PUFA intake using serum phospholipid fatty acids as a biomarker in breast cancer patients during treatment

Biomarker   PFD FFQ
  Fish and fish products Fatty fish Fish and fish products Fatty fish
Time‡ ρ 95% CI ρ 95% CI ρ 95% CI ρ 95% CI
Sum n-3† 0 0.19 −0.10, 0.45 0.21 −0.07, 0.47 0.03 − 0.25, 0.31 0.16 − 0.13, 0.42
6 0.32* 0.04, 0.55 0.27 −0.01, 0.52     
12 0.24 −0.04, 0.49 0.40* 0.14, 0.61 0.20 −0.09, 0.46 0.43* 0.17, 0.64
EPA 0 0.14 −0.15, 0.40 0.18 −0.11, 0.44 0.05 −0.23, 0.33 0.20 −0.09, 0.45
6 0.24 −0.04, 0.49 0.15 −0.14, 0.41     
12 0.16 −0.13, 0.42 0.39* 0.12, 0.60 0.13 −0.16, 0.39 0.31* 0.03, 0.54
DHA 0 0.25 −0.03, 0.50 0.23 −0.05, 0.48 0.04 −0.25, 0.32 0.22 −0.07, 0.47
6 0.33* 0.05, 0.56 0.26 −0.03, 0.50     
12 0.27 −0.02, 0.51 0.30* 0.02, 0.54 0.23 −0.06, 0.48 0.44* 0.19, 0.65
  1. CI Confidence interval, PFD pre-coded food diary, FFQ food frequency questionnaire
  2. †Sum n-3: ALA (18:3n-3), EPA (20:5n-3), DPA (22:5n-3), DHA (22:6n-3)
  3. ‡time 0: around surgery (FFQ: presurgery, PFD: postsurgery, biomarker: presurgery), time 6: 6 months postsurgery, time 12: 12 months postsurgery
  4. * p<0.05