The web-based ASSO-food frequency questionnaire for adolescents: relative and absolute reproducibility assessment

Nutrition Journal

Table 3 Intraclass correlation coefficients, exponentiated mean difference and 95% LOA of food groups daily intake, performed on transformed, energy-adjusted data

Food groups	ICC	Mean difference (%)	P-value t test	Lower limit (%)^a	Upper limit (%)^a
Vegetables (g)	0.46	99.97	0.952	89.68	111.44
Fresh fruit (g)	0.54	100.25	0.654	87.74	114.55
Dried fruit (g)	0.03	100.00	0.857	99.51	100.50
Nuts (g)	0.22	100.00	0.797	99.92	100.08
Legumes (g)	0.14	99.97	0.803	97.36	102.66
Breakfast cereals (g)	0.27	99.97	0.639	98.35	101.62
White bread (g)	0.34	99.94	0.765	95.55	104.54
Bread substitutes (g)	0.21	100.06	0.544	97.62	102.57
Pasta/rice/couscous (g)	0.36	100.10	0.606	95.57	104.85
Potatoes (g)	0.37	99.98	0.889	95.83	104.29
Sweets (g)	0.43	99.89	0.639	94.35	105.75
Cheeses/yogurt (g)	0.41	99.89	0.614	95.07	104.97
Fishery products (g)	0.40	99.84	0.152	97.19	102.56
Meat (g)	0.41	99.56	0.040	94.61	104.76
Eggs (g)	0.37	100.02	0.557	99.22	100.83
Animal fats (g)	0.44	100.00	0.827	99.90	100.10
Oils (g)	0.23	99.94	0.398	98.34	101.57
Savoury food (g)	0.41	100.23	0.475	92.81	108.24
Water (ml)	0.47	102.05	0.611	39.63	262.83
Soft drinks (ml)	0.49	100.95	0.241	83.48	122.06
Fruit juice (ml)	0.41	100.59	0.274	88.64	114.15
Milk (ml)	0.56	100.50	0.318	89.30	113.11
Tea/coffee (ml)	0.56	100.09	0.649	95.38	105.04
Alcoholic drinks (ml)	0.51	99.73	0.286	93.99	105.83

^aLower and upper Limits Of Agreement estimated through the Bland-Altman method.

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