Table 7.

Food consumption of underreporters and plausible reporters and relative differences between these for each dietary assessment method

	Diet history interviews					24-h recalls					Weighed food records
	Underreporters n = 158		Plausible reporters n = 519			Underreporters n = 105		Plausible reporters n = 572			Underreporters n = 150		Plausible reporters n = 527
	Mean	CI	Mean	CI	Diff.a	Mean	CI	Mean	CI	Diff.a	Mean	CI	Mean	CI	Diff.a
	(g/day)	(g/day)	(g/day)	(g/day)	(%)	(g/day)	(g/day)	(g/day)	(g/day)	(%)	(g/day)	(g/day)	(g/day)	(g/day)	(%)
Bread	110	103; 118	169b	162; 178	− 35	95	88; 103	141b	136; 145	− 32	102	96; 110	138b	133; 144	− 26
Pastries	20	17; 24	42b	39; 46	− 53	45	40; 50	70b	67; 73	− 36	43	37; 49	73b	69; 78	− 41
Vegetables, raw	134	119; 151	147	138; 157	− 9	55	47; 66	71b	67; 75	− 22	55	47; 65	81b	76; 87	− 32
Vegetables, cooked	93	84; 104	114b	107; 121	− 18	66	62; 72	70	68; 72	− 5	57	51; 65	80b	76; 84	− 28
Potatoes	61	55; 67	83b	79; 87	− 27	57	51; 64	67b	64; 70	− 15	63	55; 72	80b	76; 85	− 22
Fruit	211	186; 244	269b	253; 287	− 21	131	113; 151	170b	160; 180	− 23	110	94; 129	157b	147; 169	− 30
Nuts/seeds	1	1; 2	5b	4; 7	− 77	1	1; 2	4b	3; 4	− 64	1	1; 2	4b	3; 5	− 70
Milk/dairy products	128	110; 149	230b	211; 252	− 45	112	93; 135	180b	169; 193	− 38	108	92; 128	175b	162; 189	− 38
Eggs	11	9; 13	14b	13; 16	− 24	9	7; 11	12b	11; 13	− 24	11	9; 13	14b	13; 16	− 26
Meat	31	27; 35	45b	42; 49	− 32	44	40; 49	51	49; 53	− 13	35	31; 40	46b	43; 49	− 23
Sausages/meat products	35	31; 40	60b	56; 65	− 42	47	41; 53	65b	62; 68	− 28	48	42; 54	69b	65; 73	− 31
Fish/-products	17	15; 20	26b	24; 28	− 34	16	14; 19	22b	21; 23	− 24	15	12; 19	19	18; 22	− 22
Sweets	11	9; 15	21b	19; 24	− 47	8	6; 10	14b	13; 15	− 45	7	6; 10	14b	13; 16	− 49
Ice cream	4	3; 6	9b	8; 11	− 54	4	2; 7	8b	6; 9	− 50	4	3; 6	8b	7; 10	− 52
Water	1309	1190; 1434	1201	1133; 1273	9	1222	1085; 1370	963b	913; 1015	27	1131	1018; 1251	921b	862; 984	23
Coffee/tea	427	368; 494	535b	496; 578	− 20	406	349; 474	536b	506; 565	− 24	314	276; 357	430b	403; 458	− 27
Beer	68	48; 105	143b	121; 171	− 53	111	81; 155	172	152; 194	− 35	58	39; 84	161b	138; 189	− 64
Wine, sparkling wine	39	27; 61	60	50; 76	− 35	38	28; 52	64b	57; 72	− 41	23	16; 33	67b	58; 80	− 66

CI confidence interval calculated with bootstrap method

^aDiff. = relative difference between plausible reporters and underreporters (underreporters = 100%)

^bMann–Whitney U test between underreporters and plausible reporters p < 0.05