• The Maastricht FFQ: Development and validation of a comprehensive food frequency questionnaire for the Maastricht study.

      van Dongen, Martien Cjm; Wijckmans-Duysens, Nicole E G; den Biggelaar, Louise Jcj; Ocké, Marga C; Meijboom, Saskia; Brants, Henny Am; de Vries, Jeanne Hm; Feskens, Edith Jm; Bueno-de-Mesquita, H Bas; Geelen, Anouk; et al. (2018-10-26)
      The aim of this study was to develop and validate a comprehensive food frequency questionnaire (FFQ) for The Maastricht Study, a population-based prospective cohort study in Maastricht, The Netherlands. Item selection for the FFQ was based on explained variation and contribution to intake of energy and 24 nutrients. For validation, the FFQ was completed by 135 participants (25-70 y of age) of the Nutrition Questionnaires plus study. Per person, on average 2.8 (range 1-5) telephone-based 24-h dietary recalls (24HRs), two 24-h urinary samples, and one blood sample were available. Validity of 54 nutrients and 22 food groups was assessed by ranking agreement, correlation coefficients, attenuation factors, and ultimately deattenuated correlation coefficients (validity coefficients). Median correlation coefficients for energy and macronutrients, micronutrients, and food groups were 0.45, 0.36, and 0.38, respectively. Median deattenuated correlation coefficients were 0.53 for energy and macronutrients, 0.45 for micronutrients, and 0.64 for food groups, being >0.50 for 18 of 22 macronutrients, 16 of 30 micronutrients and >0.50 for 17 of 22 food groups. The FFQ underestimated protein and potassium intake compared with 24-h urinary nitrogen and potassium excretion by -18% and -2%, respectively. Correlation coefficients ranged from 0.50 and 0.55 for (fatty) fish intake and plasma eicosapentaenoic acid and docosahexaenoic acid, and from 0.26 to 0.42 between fruit and vegetable intake and plasma carotenoids. Overall, the validity of the 253-item Maastricht FFQ was satisfactory. The comprehensiveness of this FFQ make it well suited for use in The Maastricht Study and similar populations.
    • A national FFQ for the Netherlands (the FFQ-NL1.0): development and compatibility with existing Dutch FFQs.

      Eussen, Simone Jpm; van Dongen, Martien Cjm; Wijckmans, Nicole Eg; Meijboom, Saskia; Brants, Henny Am; de Vries, Jeanne Hm; Bueno-de-Mesquita, H Bas; Geelen, Anouk; Sluik, Diewertje; Feskens, Edith Jm; et al. (2018-04-22)
      In the Netherlands, various FFQs have been administered in large cohort studies, which hampers comparison and pooling of dietary data. The present study aimed to describe the development of a standardized Dutch FFQ, FFQ-NL1.0, and assess its compatibility with existing Dutch FFQs.
    • Organic food consumption during pregnancy and its association with health-related characteristics: the KOALA Birth Cohort Study.

      Simões-Wüst, Ana Paula; Moltó-Puigmartí, Carolina; Jansen, Eugene Hjm; van Dongen, Martien Cjm; Dagnelie, Pieter C; Thijs, Carel (2017-08)
      To investigate the associations of organic food consumption with maternal pre-pregnancy BMI, hypertension and diabetes in pregnancy, and several blood biomarkers of pregnant women.
    • Social networks in relation to self-reported symptomatic infections in individuals aged 40-75 - the Maastricht study.

      Brinkhues, Stephanie; Schram, Miranda T; Hoebe, Christian J P A; Kretzschmar, Mirjam E E; Koster, Annemarie; Dagnelie, Pieter C; Sep, Simone J S; van Kuijk, Sander M J; Savelkoul, Paul H M; Dukers-Muijrers, Nicole H T M (2018-07-04)
      Most infections are spread through social networks (detrimental effect). However, social networks may also lower infection acquisition (beneficial effect). This study aimed to examine associations between social network parameters and prevalence of self-reported upper and lower respiratory, gastrointestinal and urinary tract infections in a population aged 40-75.