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Table 6 Geometric mean at first dietary recall, percent difference in means over all recalls, limits of agreement and intraclass correlation coefficients for nutrient intake estimated from myfood24 and interviewer-based 24-h recalls

From: Validity of an online 24-h recall tool (myfood24) for dietary assessment in population studies: comparison with biomarkers and standard interviews

  myfood24 n = 208 Interviewer-based 24-h recall n = 197    
Geometric mean (95% CI) Geometric mean (95% CI) % Difference in meansa % Limits of agreementa Intraclass correlation
Nutrient intake:
 Total energy intake (MJ) 7.5 (7.1, 7.9) 8.5 (8.1, 8.9) −10% (− 14%, − 6%) − 63% to + 118% 0.51 (0.48, 0.54)
 Fat (g) 68 (64, 73) 82 (77, 88) −14% (−18%, − 9%) − 74% to + 182% 0.42 (0.40, 0.45)
 Saturated fatty acids per 100 g food (g) 23 (21, 25) 28 (25, 30) −13% (− 19%, − 8%) − 79% to + 263% 0.40 (0.38, 0.43)
 Monounsaturated fatty acids per 100 g food (g) 24 (22, 26) 28 (26, 30) − 14% (− 19%, − 8%) − 78% to + 238% 0.40 (0.38, 0.43)
 Polyunsaturated fatty acids per 100 g food (g) 12 (11, 13) 14 (13, 15) −11% (−17%, −5%) − 80% to + 303% 0.39 (0.36, 0.41)
 Protein (g) 72 (68, 78) 78 (73, 82) −9% (− 14%, − 5%) − 68% to + 158% 0.45 (0.42, 0.48)
 Carbohydrate (g) 198 (186, 211) 224 (213, 236) −12% (−17%, − 7%) − 70% to + 162% 0.54 (0.51, 0.56)
 Starch (g) 107 (99, 116) 117 (110, 126) − 9% (− 15%, − 3%) − 79% to + 263% 0.44 (0.41, 0.46)
 Total sugars (g) 73 (67, 80) 92 (86, 98) −20% (− 25%, − 15%) −80% to + 216% 0.46 (0.43, 0.49)
 Alcohol (g) 1.3 (1.0, 1.6) 1.5 (1.2, 2.0) −9% (− 23%, + 7%) − 98% to + 4177% 0.38 (0.35, 0.40)
 Englyst fibre (g) 14 (13, 15) 15 (14, 16) −14% (− 19%, − 9%) −75% to + 199% 0.43 (0.41, 0.46)
 Cholesterol (g) 0.17 (0.15, 0.20) 0.21 (0.18, 0.24) −12% (− 20%, − 3%) − 91% to + 793% 0.37 (0.35, 0.39)
 Sodium (g) 2.3 (2.1, 2.5) 2.4 (2.2, 2.6) −4% (− 10%, + 2%) − 76% to + 283% 0.44 (0.41, 0.47)
 Potassium (g) 2.7 (2.5, 2.9) 3.1 (3.0, 3.3) − 14% (−18%, − 10%) − 69% to + 137% 0.48 (0.45, 0.51)
 Calcium (g) 0.68 (0.63, 0.74) 0.83 (0.77, 0.89) −7% (− 22%, − 12%) −79% to + 223% 0.46 (0.43, 0.49)
 Phosphorous (g) 1.2 (1.1, 1.3) 1.4 (1.3, 1.4) −12% (− 16%, −8%) −68% to + 143% 0.51 (0.48, 0.53)
 Iron (mg) 11.3 (10.6, 12.0) 12.3 (11.6, 13.0) −10% (−14%, − 5%) − 70% to + 170% 0.46 (0.43, 0.49)
 Copper (mg) 1.8 (1.7, 1.9) 1.8 (1.7, 1.8) −2% (−6%, + 2%) − 63% to + 162% 0.42 (0.39, 0.45)
 Zinc (mg) 8.6 (8.0, 9.2) 10.0 (9.4, 10.6) −10% (−14%, −4%) −72% to + 197% 0.46 (0.43, 0.48)
 Selenium (μg) 38 (33, 42) 44 (40, 48) −13% (−20%, −6%) − 86% to + 445% 0.43 (0.40, 0.45)
 Iodine (μg) 85 (75, 96) 128 (116, 140) −27% (− 33%, −9%) −91% to + 509% 0.44 (0.42, 0.47)
 Retinol (μg) 143 (114, 179) 218 (181, 262) −27% (− 36%, − 15%) − 98% to + 2188% 0.37 (0.35, 0.40)
 Vitamin D (μg) 2.1 (1.9, 2.4) 2.2 (1.9, 2.5) −3% (− 13%, + 7%) −91% to + 908% 0.37 (0.35, 0.39)
 Vitamin E (mg) 7.7 (6.9, 8.5) 9.7 (8.9, 10.5) −19% (− 25%, −12%) −86% to + 381% 0.43 (0.40, 0.46)
 Thiamin (mg) 1.9 (1.8, 2.0) 1.9 (1.9, 2.0) −6% (−9%, −2%) − 61% to + 129% 0.46 (0.43, 0.49)
 Niacin (mg) 18.7 (17.4, 20.2) 20.0 (18.5, 21.5) −5% (−10%, + 1%) −75% to + 265% 0.41 (0.38, 0.43)
 Vitamin B6 (mg) 2.2 (2.1, 2.3) 2.5 (2.4, 2.7) −10% (−14%, −7%) − 65% to 127% 0.42 (0.39, 0.45)
 Vitamin B12 (μg) 3.4 (3.1, 3.9) 5.2 (4.8, 5.8) −27% (− 33%, − 21%) −90% to + 422% 0.40 (0.38, 0.43)
 Folate (mg) .22 (.20, .24) .25 (.24, .27) −14% (− 21%, −11%) −78% to + 215% 0.45 (0.42, 0.48)
 Pantothenic acid (mg) 4.6 (4.3, 4.9) 5.9 (5.5, 6.2) −20% (− 24%, − 16%) −74% to + 150% 0.43 (0.41, 0.46)
 Biotin (μg) 30 (28, 33) 37 (35, 40) −19% (−25%, −13%) −81% to + 240% 0.45 (0.42, 0.48)
 Vitamin C (mg) 59 (51, 69) 76 (66, 86) −28% (− 36%, −20%) −94% to + 765% 0.45 (0.42, 0.47)
  1. aThe difference in means and limits of agreement relate to the ratio of geometric means because of log transformation and are presented as % differences