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Table 5 Relative validity study: Median daily food intakes, correlation coefficients and agreement between FFQ and 3DR in 112 lactating mothers

From: Reproducibility and relative validity of a semi-quantitative food frequency questionnaire for the Chinese lactating mothers

Food groups Intake value
Median (P25, P75)
p -value c Correlation coefficient Agreement
Percentage classified in
FFQ a 3DR b r d r e-adj e r de-att f Same quartile Same or adjacent quartile Extreme quartile
Cereals and cereal products (g/day) 153 (120, 191) 192 (140, 217) < 0.01 0.56** 0.55** 0.67** 25.7 62.3 13.3
Potatoes (g/day) 17 (9, 32.5) 15 (1.7, 41) 0.328 0.51** 0.52** 0.48** 19.5 62.9 6.2
Coarse cereals (g/day) 17.5 (6, 28) 13 (2, 39) 0.134 0.40** 0.37** 0.38** 23.9 61.2 8.0
Vegetables (g/day) 303 (215, 421) 294 (207, 410) < 0.01 0.45** 0.45** 0.44** 31.9 71.7 8.8
Fruits (g/day) 306 (228, 411) 228 (118, 356) < 0.01 0.38** 0.37** 0.42** 25.7 62.0 15.9
Meat (g/day) 95 (68, 130) 116 (73, 163) < 0.01 0.41** 0.39** 0.50** 27.5 62.0 8.8
Poultry (g/day) 53 (40, 78) 60 (40, 80) 0.58 0.52** 0.53** 0.51** 26.5 63.7 11.5
Aquatic products (g/day) 52 (34, 79) 43 (25, 69) 0.47 0.41** 0.32** 0.47** 41.6 79.7 9.7
Eggs (g/day) 60 (50, 73) 68 (50, 90) 0.068 0.50* 0.42** 0.49** 43.4 83.2 3.5
Beans and legume products (g/day) 10 (5, 19) 6 (0, 16) 0.214 0.54* 0.54** 0.47** 42.5 83.2 4.4
Milk and milk products (g/day) 130 (69, 201) 83 (0, 194) 0.007 0.43** 0.42** 0.34* 45.1 74.3 8.0
Nuts (g/day) 10 (5, 20) 0 (0, 7.5) < 0.01 0.32** 0.26** 0.36** 26.5 62.0 12.4
  1. a FFQ: average of the FFQ1 and the FFQ2
  2. b 3DR: 3-day dietary records which was completed one week after the FFQ1, including two weekdays and one weekend
  3. c p -value: Wilcoxon signed rank test
  4. d r: Spearman rank correlation coefficients
  5. e r e-adj: Energy-adjusted correlation coefficient
  6. f r de-att: de-attenuated correlation coefficients
  7. *p < 0.05, **p < 0.01