Table 6.

Tracking of food consumption in clinical research by age class.

	Total	18–24 years	25–34 years	35–44 years	45–54 years	55–64 years	65 years or over	Global p-value
		A	B	C	D	E	F
Would you be prepared to keep a systematic record of your food consumption using a mobile app?
	N = 1529	N = 102	N = 337	N = 350	N = 306	N = 265	N = 169
No	102 (6.7%)	1 (1.0%)	7 (2.1%)	10 (2.9%)	19 (6.2%)	34 (12.8%)	31 (18.3%)	<0.001
Yes	1427 (93.3%)	101 (99.0%)	330 (97.9%)	340 (97.1%)	287 (93.8%)	231 (87.2%)	138 (81.7%)
Significant difference with other age class	–	E F	E F	E F	F	A B C	A B C D
If yes, for how long would you be willing to complete this record?
	N = 1427	N = 101	N = 330	N = 340	N = 287	N = 231	N = 138
<48 h	42 (2.9%)	5 (5.0%)	7 (2.1%)	11 (3.2%)	7 (2.4%)	10 (4.3%)	2 (1.4%)	0.010
48 h to 4 days	91 (6.4%)	6 (5.9%)	17 (5.2%)	24 (7.1%)	13 (4.5%)	19 (8.2%)	12 (8.7%)
4 days to 1 week	146 (10.2%)	11 (10.9%)	21 (6.4%)	34 (10.0%)	27 (9.4%)	28 (12.1%)	25 (18.1%)
1–2 weeks	196 (13.7%)	15 (14.9%)	41 (12.4%)	52 (15.3%)	31 (10.8%)	32 (13.9%)	25 (18.1%)
2–4 weeks	202 (14.2%)	7 (6.9%)	51 (15.5%)	50 (14.7%)	47 (16.4%)	27 (11.7%)	20 (14.5%)
Over 4 weeks	750 (52.6%)	57 (56.4%)	193 (58.5%)	169 (49.7%)	162 (56.4%)	115 (49.8%)	54 (39.1%)
Significant difference with other age class	–	–	F	–	F	–	B D
If yes, how much time would you be prepared to devote to this record per meal?
	N = 1427	N = 101	N = 330	N = 340	N = 287	N = 231	N = 138
<1 min	66 (4.6%)	4 (4.0%)	17 (5.2%)	17 (5.0%)	13 (4.5%)	11 (4.8%)	4 (2.9%)	0.070
1– 3 min	543 (38.1%)	40 (39.6%)	129 (39.1%)	148 (43.5%)	109 (38.0%)	76 (32.9%)	41 (29.7%)
3–10 min	629 (44.1%)	40 (39.6%)	148 (44.8%)	135 (39.7%)	116 (40.4%)	112 (48.5%)	78 (56.5%)
Over 10 min	189 (13.2%)	17 (16.8%)	36 (10.9%)	40 (11.8%)	49 (17.1%)	32 (13.9%)	15 (10.9%)
Significant difference with other age class	–	–	–	–	–	–	–

Global p-value, when significant; Age classes, Significant difference with other age classes; N = number of participants per age class.