. 2017 Sep 19;6:e49. doi: 10.1017/jns.2017.45

Table 2.

Differences in total energy and nutrient intakes and Lin's concordance correlation coefficients (LCC) between the self-administered web-based 24-h dietary recall and the interviewer-administered telephone-based 24-h dietary recalls (n 514)

(Mean values and standard deviations, proportional differences and LCC)

	Web-based 24-h recalls^*		Telephone-based 24-h recalls^*		Difference between both recall methods^*				LCC^*
	Mean	sd	Mean	sd	Mean	sd	%^†	P
Energy
kcal	1911	507	2081	465	−171	430	−8·20	<0·0001	0·57
kJ	8014	2122	8728	1947	−714	1795	−8·18	<0·0001	0·58
Macronutrients
Total protein (g)	74·8	11·8	82·2	13·3	−7·46	13·6	−9·07	<0·0001	0·35
Vegetable protein (g)	32·1	6·95	33·8	6·89	−1·64	6·58	−4·86	<0·0001	0·53
Animal protein (g)	42·8	13·7	48·4	14·9	−5·69	15·2	−11·7	<0·0001	0·41
Total fat (g)	70·3	11·7	79·4	11·7	−9·16	12·5	−11·5	<0·0001	0·33
SFA (g)	27·0	6·10	29·3	5·88	−2·29	6·01	−7·83	<0·0001	0·46
MUFA (g)	23·8	5·79	27·2	5·73	−3·38	6·38	−12·4	<0·0001	0·33
PUFA (g)	12·9	3·87	15·8	4·25	−2·89	4·71	−18·3	<0·0001	0·26
Linoleic acid (g)	10·5	3·37	12·8	3·77	−2·35	4·13	−18·3	<0·0001	0·27
Trans-fatty acids (g)	1·36	0·73	1·30	0·63	0·07	0·85	5·30	0·07	0·22
α-Linolenic acid (g)	1·36	0·48	1·75	0·56	−0·39	0·62	−22·4	<0·0001	0·23
EPA (g)	0·10	0·21	0·12	0·19	−0·02	0·23	−17·2	0·05	0·30
DHA (g)	0·13	0·33	0·17	0·30	−0·04	0·38	−22·3	0·02	0·26
Cholesterol (g)	203	102	212	95·6	−9·29	115	−4·37	0·07	0·32
Total carbohydrates (g)	210	32·2	223	33·7	−13·5	30·5	−6·05	<0·0001	0·53
Mono- and disaccharides (g)	86·9	25·6	100	27·3	−13·1	24·9	−13·1	<0·0001	0·50
Polysaccharides (g)	123	24·8	123	22·6	−0·42	23·3	−0·34	0·68	0·52
Dietary fibre (g)	21·6	5·68	23·2	5·83	−1·59	5·14	−6·85	<0·0001	0·58
Alcohol (g)	12·6	14·7	12·7	13·5	−0·05	10·9	−0·39	0·92	0·70
Micronutrients
Ca (mg)	926	266	1048	286	−122	258	−11·6	<0·0001	0·52
K (mg)	3131	579	3407	570	−275	575	−8·08	<0·0001	0·45
β-Carotene (μg)	2263	2703	2328	2484	−65·6	3100	−2·82	0·63	0·29
Vitamin B₁ (mg)	0·98	0·36	0·99	0·28	−0·01	0·42	−1·15	0·54	0·15
Vitamin B₂ (mg)	1·37	0·37	1·49	0·40	−0·13	0·40	−8·51	<0·0001	0·45
Vitamin B₆ (mg)	1·56	0·54	1·73	0·54	−0·17	0·58	−9·71	<0·0001	0·40
Vitamin B₁₂ (μg)	4·25	3·00	5·07	3·64	−0·82	3·94	−16·1	<0·0001	0·30
Vitamin D (μg)	3·08	1·86	3·36	1·88	−0·28	2·27	−8·38	0·01	0·26
Vitamin E (mg)	11·0	4·20	13·1	4·18	−2·01	4·88	−15·4	<0·0001	0·29
Vitamin C (mg)	89·5	49·8	98·3	49·2	−8·76	54·3	−8·91	0·00	0·39
Lycopene (μg)	1342	2106	2165	3317	−823	3429	−38·0	<0·0001	0·23
Retinol activity equivalents (μg)	730	617	800	595	−70·4	809	−8·79	0·05	0·11
Folic acid equivalents (μg)	254	86·0	298	97·2	−44·7	97·4	−15·0	<0·0001	0·39

Intakes of nutrients and LCC are based on energy-adjusted values; energy-adjusted intakes were calculated using the residual method.

^†

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