Relative validity of the food frequency questionnaire used to assess dietary intake in the Leiden Longevity Study

Nutrition Journal

Table 1 Baseline characteristics of participants of the Leiden Longevity Study providing FFQ data

		Subjects with FFQ and 24h recall data
Variable	All subjects	All	Men	Women
N	1630	128	62	66
Offspring, n (%)	1151 (71)	62 (48)	30 (48)	32 (48)
Age, years	62 ± 7	62 ± 6	64 ± 6	61 ± 6
Males, n (%)	709 (44)	62 (48)	61 (100)	0 (0)
Body mass index, kg/m²	25.3 ± 3.5^a	25.7 ± 3.4^e	26.0 ± 2.7	25.3 ± 4.0
Energy intake to basal metabolic rate ratio	1.32^a	1.27^e	1.24	1.29
Alcohol use, n (%)	1133 (72)^b	95 (74)	51 (82)	44 (67)
Supplement use, n (%)	573 (35)	45 (35)	17 (27)	28 (42)
Prescribed diet, n (%)	189 (12)	15 (12)	7 (11)	8 (12)
Current cigarette smoking, n (%)	193 (12)^c	13 (10)^f	6 (10)	7 (11)
Medical condition, n (%)	476 (29)^d	50 (39)^g	26 (42)	24 (36)
Myocardial infarction, n (%)	36 (2)	0 (0)	0 (0)	0 (0)
Cerebrovascular accident, n (%)	40 (3)	2 (2)	1 (2)	1 (2)
Hypertension, n (%)	332 (23)	40 (36)	22 (41)	18 (32)
Diabetes mellitus, n (%)	60 (4)	9 (8)	7 (13)	2 (4)
Cancer, n (%)	122 (7)	10 (8)	5 (8)	5 (8)

a = Data on BMI and EI to BMR ratio were missing for 48 subjects; b= Data on alcohol use were missing for 47 subjects; c = Data on current smoking were missing for 49 subjects; d = Data on MI, cerebrovascular accident, hypertension and diabetes were missing for, respectively, 182, 183, 209 and 198 subjects; e = Data on BMI and EI to BMR ratio were missing for 2 subjects; f = Data on current smoking were missing for one subject; g = Data on cerebrovascular accident, hypertension and diabetes were missing for, respectively, 15, 17 and 20 subjects.

ISSN: 1475-2891