Table 3.
Validation study: trimester‐specific absolute daily nutrient intakes as estimated by the three 3‐day food diaries (FDs) and their correlations with the estimates produced by the food frequency questionnaire administered in the immediate post‐partum period (FFQp) (n = 101)
| Nutrient | Mean (SD) or Median (P25; P75) | Crude Pearson correlation coefficients and 95% confidence intervals (CI) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| FD1* | FD2 † | FD3 ‡ | FFQp and 3 FD § | FFQp and FD1* | FFQp and FD2 † | FFQp and FD3 ‡ | |||||
| Energy (kcal) | 2137 (430) | 2175 (500) | 2133 (496) | 0.44 | 0.27, 0.59 | 0.38 | 0.20, 0.54 | 0.41 | 0.23, 0.56 | 0.33 | 0.14, 0.49 |
| Protein (g) | 99.3 (19.3) | 100.0 (17.9) | 98.5 (22.1) | 0.31 | 0.12, 0.48 | 0.22 | 0.03, 0.40 | 0.27 | 0.08, 0.44 | 0.26 | 0.07, 0.43 |
| Carbohydrates (g) | 256.7 (60.2) | 258.7 (69.1) | 261.9 (66.1) | 0.51 | 0.35, 0.64 | 0.43 | 0.26, 0.58 | 0.49 | 0.33, 0.63 | 0.33 | 0.14, 0.49 |
| Total fat (g) | 81.0 (20.6) | 83.8 (23.7) | 78.9 (23.9) | 0.31 | 0.12, 0.48 | 0.21 | 0.02, 0.39 | 0.25 | 0.06, 0.42 | 0.29 | 0.10, 0.46 |
| Vitamin A (µg) | 951.6 (609.4; 1353.4) | 940.0 (606.1; 1285.1) | 928.3 (679.2; 1283.1) | 0.40 ¶ | 0.22, 0.55 | 0.30 ¶ | 0.11, 0.47 | 0.26 ¶ | 0.07, 0.43 | 0.36 ¶ | 0.18, 0.52 |
| Vitamin E (mg) | 8.3 (7.0; 10.2) | 8.9 (7.2; 11.5) | 8.2 (6.5; 10.1) | 0.29 | 0.10, 0.46 | 0.13 ¶ | −0.06, 0.32 | 0.27 ¶ | 0.08, 0.44 | 0.31 ¶ | 0.12, 0.48 |
| Vitamin C (mg) | 101.2 (53.2) | 94.4 (49.3) | 102.0 (62.4) | 0.43 | 0.26, 0.58 | 0.31 | 0.12, 0.48 | 0.35 | 0.17, 0.51 | 0.38 | 0.20, 0.54 |
| Thiamin (mg) | 1.9 (0.5) | 1.9 (0.5) | 1.9 (0.5) | 0.43 | 0.26, 0.58 | 0.29 | 0.10, 0.46 | 0.33 | 0.14, 0.49 | 0.37 | 0.19, 0.53 |
| Riboflavin (mg) | 2.2 (1.7; 2.7) | 2.2 (1.8; 2.7) | 2.3 (1.7; 2.7) | 0.55 ¶ | 0.40, 0.67 | 0.31 ¶ | 0.12, 0.48 | 0.54 ¶ | 0.39, 0.67 | 0.52 ¶ | 0.36, 0.65 |
| Vitamin B12 (µg) | 6.2 (4.3; 10.1) | 6.6 (4.6; 9.6) | 6.4 (4.6; 9.3) | 0.33 ¶ | 0.14, 0.49 | 0.27 ¶ | 0.08, 0.44 | 0.12 ¶ | −0.08, 0.31 | 0.36 ¶ | 0.18, 0.52 |
| Folate (µg) | 271.2 (207.0; 365.4) | 286.3 (205.6; 395.1) | 316.8 (229.1; 446.7) | 0.40 | 0.22, 0.55 | 0.31 ¶ | 0.12, 0.48 | 0.41 ¶ | 0.23, 0.56 | 0.31 ¶ | 0.12, 0.48 |
| Calcium (mg) | 989.3 (301.7) | 1033.3 (382.4) | 994.0 (349.8) | 0.43 | 0.26, 0.58 | 0.27 | 0.08, 0.44 | 0.39 | 0.21, 0.54 | 0.42 | 0.24, 0.57 |
| Magnesium (mg) | 295.1 (63.5) | 293.2 (74.0) | 294.6 (74.9) | 0.42 | 0.24, 0.57 | 0.25 | 0.06, 0.42 | 0.37 | 0.19, 0.53 | 0.41 | 0.23, 0.56 |
| Iron (mg) | 14.4 (4.8) | 14.3 (4.9) | 14.3 (5.0) | 0.43 | 0.26, 0.58 | 0.32 | 0.12, 0.49 | 0.36 | 0.18, 0.52 | 0.33 | 0.14, 0.49 |
P25, 25th percentile; P75, 75th percentile; *Three‐day FDs completed in the first trimester; †Three‐day FDs completed in the second trimester; ‡Three‐day FDs completed in the third trimesters; §Nutrient intakes as estimated by the average of the three 3‐day FDs; ¶Correlation coefficients calculated after Box–Cox transformation.