title: FFQ for the adult population of the capital of Ecuador (FFQ-Quito): development, reliability and validity.
abstract: OBJECTIVE
  To assess the reliability and validity of a semi-quantitative FFQ designed to evaluate the usual nutrient intake of adults in Quito, Ecuador.
  
  
  METHODS
  Dietary data using 24 h recalls (24hR) were used to design a list of commonly consumed foods. The relative validity of a 111-item FFQ was evaluated by comparing nutrient intakes against three non-consecutive 24hR. All nutrients were energy-adjusted. Reliability was assessed using two FFQ (FFQ1 and FFQ2) and assessed by the intra-class correlation coefficient. The comparisons between the FFQ and the 24hR were assessed by the de-attenuated Pearson correlation coefficient, weighted kappa and by Bland-Altman plots.
  
  
  METHODS
  Quito, Ecuador.
  
  
  METHODS
  Overall, 345 adults were enrolled in the present study. Two hundred and fifty participated in FFQ development and ninety-five participated in the FFQ validity and reliability.
  
  
  RESULTS
  The FFQ produced higher energy and nutrient intakes. Reliability correlation coefficients after adjusting for energy ranged from 0·62 to 0·88 for protein and Ca, respectively. For the validity study, energy-adjusted and de-attenuated correlation coefficients between the questionnaire and the 24hR ranged from 0·21 for fat to 0·65 for Ca. Only 4 % of the participants were grossly misclassified and 46 % had weighted kappa higher than 0·42. The Bland-Altman plot showed a constant bias with a tendency to increase according to the intake level.
  
  
  CONCLUSIONS
  The FFQ showed reasonably good relative validity and reliable measurements, especially for nutrients considered protective and risk markers of non-communicable disease, and can be used to assess usual nutrient intake in this population.
authors: 1Department of Social Medicine,School of Medicine,Postgraduate Studies Program in Epidemiology,Federal University of Rio Grande do Sul,Rua Ramiro Barcelos 2400,90035-003 Porto Alegre,Brazil.
authors: Katherine M
authors: KM
authors: Silva-Jaramillo
authors: 1Department of Social Medicine,School of Medicine,Postgraduate Studies Program in Epidemiology,Federal University of Rio Grande do Sul,Rua Ramiro Barcelos 2400,90035-003 Porto Alegre,Brazil.
authors: Marilda B
authors: MB
authors: Neutzling
authors: 1Department of Social Medicine,School of Medicine,Postgraduate Studies Program in Epidemiology,Federal University of Rio Grande do Sul,Rua Ramiro Barcelos 2400,90035-003 Porto Alegre,Brazil.
authors: Michele
authors: M
authors: Drehmer
mesh_terms: D000328:Adult; D004032:Diet; D015930:Diet Records; D004034:Diet Surveys; D004484:Ecuador; D002149:Energy Intake; D005247:Feeding Behavior; D005260:Female; D006801:Humans; D008297:Male; D011939:Mental Recall; D008875:Middle Aged; D015596:Nutrition Assessment; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires / Q000592:standards*; D055815:Young Adult
keywords: Dietary intake; FFQ; Reliability; Validation studies
references: Lancet. 1986 Feb 8;1(8476):307-10
references: 2868172
references: J Natl Cancer Inst. 2000 Apr 19;92(8):597-9
references: 10772671
references: J Chronic Dis. 1978;31(6-7):399-418
references: 711832
references: Am J Clin Nutr. 1983 Jun;37(6):986-95
references: 6846242
references: Ann Oncol. 2012 Jan;23(1):37-45
references: 21617020
references: Public Health Nutr. 2013 Oct;16(10):1782-8
references: 22995762
references: Public Health Nutr. 2014 Feb;17(2):287-96
references: 23199788
references: Public Health Nutr. 2013 Nov;16(11):1995-2004
references: 23113958
references: Lancet. 2011 Apr 23;377(9775):1438-47
references: 21474174
references: J Nutr Health Aging. 2001;5(3):139-43
references: 11458282
references: Salud Publica Mex. 1998 Mar-Apr;40(2):133-40
references: 9617194
references: Lancet. 1995 Oct 21;346(8982):1085-7
references: 7564793
references: Lancet. 2010 Nov 27;376(9755):1861-8
references: 21074258
references: J Nutr Educ Behav. 2012 Nov-Dec;44(6):609-13
references: 21737352
references: Am J Clin Nutr. 1994 Jan;59(1 Suppl):262S-265S
references: 8279437
references: Cad Saude Publica. 2009 Apr;25(4):840-8
references: 19347210
references: Am J Clin Nutr. 2008 Aug;88(2):324-32
references: 18689367
references: Cad Saude Publica. 2010 Nov;26(11):2068-79
references: 21180980
references: Am J Epidemiol. 1985 Jul;122(1):13-26
references: 4014190
references: Nutr Res. 2010 Aug;30(8):550-7
references: 20851309
references: Am J Clin Nutr. 1999 Oct;70(4):439-47
references: 10500011
references: Int J Epidemiol. 1997;26 Suppl 1:S49-58
references: 9126533
references: Public Health Nutr. 2002 Aug;5(4):567-87
references: 12186666
references: Cad Saude Publica. 2013 Feb;29(2):379-89
references: 23459823
references: Int J Epidemiol. 1997;26 Suppl 1:S71-81
references: 9126535
references: Food Nutr Res. 2012;56:
references: 23118710
references: Prev Chronic Dis. 2006 Jul;3(3):A77
references: 16776878
references: PLoS One. 2012;7(5):e37958
references: 22662256
references: Am J Clin Nutr. 1997 Apr;65(4 Suppl):1220S-1228S; discussion 1229S-1231S
references: 9094926
references: Am J Clin Nutr. 1989 Jul;50(1):155-67
references: 2750688
references: J Natl Cancer Inst. 2010 May 5;102(9):583-5
references: 20407089