Table 5.

Difference in amount eaten (g/d) of different food groups between the self-administered web-based and the interviewer-administered telephone-based 24-h dietary recalls (n 514)

(Mean values and standard deviations, proportional differences and Lin's concordance correlation coefficients (LCC))

	Web-based 24-h recalls		Telephone-based 24-h recalls		Difference between both recall methods
	Mean	sd	Mean	sd	Mean	sd	%*	P	LCC
Alcoholic beverages	166	233	163	210	3	183	1·7	0·73	0·66
Bread	139	63	139	62	0	46	−0·2	0·89	0·73
Cereal products and binding agents	53	63	58	59	−4	72	−7·4	0·18	0·29
Cheese	30	23	36	25	−6	25	−15·3	<0·0001	0·42
Coffee, tea and water	1205	530	1439	587	−234	363	−16·3	<0·0001	0·73
Composite dishes	39	73	39	64	1	97	1·5	0·89	−0·01
Eggs	15	21	14	19	1	23	6·8	0·35	0·37
Fats, oils and savoury sauces	29	21	39	22	−10	27	−26·0	<0·0001	0·20
Fish	20	35	25	39	−5	46	−21·7	0·01	0·24
Fruit	156	131	168	116	−12	118	−6·9	0·03	0·54
Fruit/vegetable juices, soft drinks	127	160	152	182	−25	133	−16·6	<0·0001	0·69
Legumes	7	21	6	21	1	26	13·0	0·49	0·23
Meat, meat products and poultry	80	59	81	51	−1	62	−1·1	0·75	0·37
Milk and milk products	277	179	305	185	−28	136	−9·1	<0·0001	0·71
Nuts, seeds and snacks	22	27	23	27	−1	30	−5·0	0·38	0·36
Pastry, cake and biscuits	40	35	40	34	0	41	−0·3	0·95	0·29
Potatoes	63	59	67	60	−4	76	−5·7	0·25	0·20
Savoury sandwich fillings	3	7	3	6	1	7	18·3	0·08	0·51
Soups	65	89	53	75	12	93	23·2	<0·01	0·35
Soya and vegetarian products	15	51	17	57	−2	31	−12·3	0·13	0·84
Sugar and confectionery	23	20	29	24	−7	23	−23·1	<0·0001	0·44
Vegetables	143	95	161	100	−18	104	−11·1	<0·001	0·42

^*Proportional difference is calculated as ((mean of web-based 24 h recall) – (mean of telephone-based 24 h recall))/(mean of telephone-based 24 h recall) × 100.