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Table 3 Calibration parameters and means ± (SD) for energy and nutrients intake estimated from FFQ-1, 24-HRs and calibrated FFQ-1 for boys and girls (n = 111)

From: Validity and reliability of a food frequency questionnaire to estimate dietary intake among Lebanese children

Energy/nutrients α (95 % CI) β (95 % CI) FFQ-1 24-HRs Calibrated FFQ-1
Mean ± SD Mean ± SD Mean ± SD
Girls (n = 58)
 Energy (Kcal) 644.56 (332.25–956.88) 0.43 (0.31–0.55)** 2455.59 ± 809.79 1695.71 ± 503.88 1695.55 ± 346.59
 Protein (g) 36.38 (20.12–52.65) 0.28 (0.08–0.49)** 77.49 ± 23.74 58.49 ± 19.06 58.47 ± 6.76
 Carbohydrate (g) 107.21 (67.96–146.46) 0.33 (0.22–0.44)** 334.74 ± 114.28 217.65 ± 60.58 217.67 ± 37.71
 Fat (g) 17.70 (1.75–33.64) 0.53 (0.37–0.68)** 94.40 ± 37.46 67.54 ± 29.58 67.73 ± 19.85
 Saturated fat (g) 8.03 (3.31–12.74) 0.42 (0.26–0.58)** 28.06 ± 10.77 19.80 ± 7.77 19.78 ± 4.51
 MUFA (g) 7.14 (1.06–13.22) 0.48 (0.32–0.65)** 34.74 ± 14.75 23.97 ± 11.40 23.81 ± 7.08
 PUFA (g) 1.31 (–3.78–6.40) 0.72 (0.50–0.93)** 21.04 ± 10.78 16.43 ± 11.64 16.43 ± 7.75
Trans-fatty acid (g) 0.07 (0.03–0.10) 0.23 (0.08–0.38)* 0.15 ± 0.17 0.10 ± 0.10 0.10 ± 0.04
 Calcium (mg) 342.33 (181.53–503.14) 0.24 (0.08–0.41)* 921.57 ± 278.95 566.81 ± 186.94 567.19 ± 68.06
 Iron (mg) 6.93 (3.91–9.95) 0.32 (0.17–0.48)** 18.67 ± 6.88 13.00 ± 4.50 13.00 ± 2.23
 Fiber (g) 8.77 (5.78–11.77) 0.24 (0.12–0.36)** 23.07 ± 9.80 14.30 ± 4.97 14.31 ± 2.35
 Sugar (g) 30.10 (18.94) 0.27 (0.17–0.36)** 104.50 ± 46.76 57.93 ± 21.12 57.90 ± 12.44
Boys (n = 53)
 Energy (Kcal) 1280.16 (866.98–1693.33) 0.21 (0.06–0.35)** 2676.07 ± 828.09 1831.75 ± 467.13 1831.43 ± 170.58
 Protein (g) 42.25 (26.38–60.13) 0.23 (0.04–0.42)** 86.33 ± 27.52 63.13 ± 19.31 63.11 ± 6.33
 Carbohydrate (g) 180.85 (127.01–234.68) 0.17 (0.03–0.31)* 370.61 ± 124.47 243.25 ± 64.53 247.61 ± 20.66
 Fat (g) 40.32 (24.15–56.49) 0.29 (0.14–0.45)** 98.73 ± 33.89 69.39 ± 21.19 69.42 ± 8.13
 Saturated fat (g) 16.37 (11.69–21.05) 0.18 (0.05–0.32)** 32.48 ± 13.84 22.33 ± 7.00 22.1 ± 2.53
 MUFA (g) 11.13 (4.84–17.42) 0.38 (0.21–0.55)** 35.02 ± 11.67 24.46 ± 13.84 24.44 ± 4.43
 PUFA (g) 11.17 (6.40–15.94) 0.20 (−0.01–0.41) 20.54 ± 9.95 15.30 ± 7.67 15.30 ± 2.00
Trans-fatty acid (g) 0.07 (0.03–0.11) 0.12 (−0.01–0.38) 0.16 ± 0.14 0.10 ± 0.11 0.10 ± 0.03
 Calcium (mg) 542.27 (352.06–732.47) 0.14 (−0.02–0.31) 1079.04 ± 429.39 695.36 ± 257.79 695.49 ± 60.97
 Iron (mg) 5.45 (2.60–8.29) 0.43 (0.29–0.56)** 19.54 ± 7.48 13.78 ± 4.83 13.77 ± 3.19
 Fiber (g) 11.22 (7.67–14.78) 0.19 (0.05–0.33)** 23.68 ± 9.44 15.76 ± 5.03 15.77 ± 1.81
 Sugar (g) 58.13 (42.08–74.17) 0.09 (−0.03–0.21) 123.30 ± 47.70 69.04 ± 21.05 84.02 ± 10.02
  1. *p-value < 0.05; **p-value < 0.01