Abstract:
OBJECTIVE:To investigate item non-response in a postal food-frequency questionnaire (FFQ), and to assess the effect of substituting/imputing missing values on dietary intake levels in the Norwegian Women and Cancer study (NOWAC). We have adapted and probably for the first time applied k nearest neighbours (KNN) imputation to FFQ data. DESIGN:Data from a recent reproducibility study were used. The FFQ was mailed twice (test-retest) about 3 months apart to the same subjects. Missing responses in the test FFQ were imputed using the null value (frequencies = null, amount = smallest), the sample mode, the sample median, KNN, and retest values. SETTING:A methodological substudy of NOWAC, a national population-based cohort. SUBJECTS:A random sample of 2000 women aged 46-75 years was drawn from the cohort in 2002 (response 75%). The imputation methods were compared for 1430 women who completed at least 50% of the test FFQ. RESULTS:We imputed 16% missing values in the overall test data matrix. Compared to null value imputation, the largest differences in estimated dietary intake were seen for KNN, and for food items with a high proportion of missing. Imputation with retest values increased total energy intake, indicating that not all missing values are caused by respondents failing to specify no consumption, and that null value imputation may lead to underestimation and misclassification. CONCLUSION:Missing values in FFQs present a methodological challenge. We encourage the application and evaluation of newer imputation methods, including KNN, which may reduce imputation errors and give more accurate intake estimates.
journal_name
Public Health Nutrjournal_title
Public health nutritionauthors
Parr CL,Hjartåker A,Scheel I,Lund E,Laake P,Veierød MBdoi
10.1017/S1368980007000365subject
Has Abstractpub_date
2008-04-01 00:00:00pages
361-70issue
4eissn
1368-9800issn
1475-2727pii
S1368980007000365journal_volume
11pub_type
杂志文章abstract:OBJECTIVE:Bread is a staple of the Mediterranean diet but contributes substantially to its salt content (19 % in Spain). The objective of the present study was to assess the feasibility and acceptability of salt reduction in partially baked breads, partly replacing salt (NaCl) with a potassium salt, with subsequent fol...
journal_title:Public health nutrition
pub_type: 杂志文章
doi:10.1017/S1368980015000944
更新日期:2016-04-01 00:00:00
abstract:OBJECTIVES:To describe food consumption during the school day of rural Jamaican children and participation in two government school feeding programmes. To determine factors which were related to these. DESIGN:Cross sectional. SETTING:16 primary schools in rural Jamaica. SUBJECTS:415 children in grades 2 and 5 (ages ...
journal_title:Public health nutrition
pub_type: 杂志文章
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更新日期:1998-03-01 00:00:00
abstract:OBJECTIVE:To evaluate the prevalence of vitamin D deficiency and insufficiency, as well as their association with Hb and elevated blood lead levels (BLL) in children in China. DESIGN:A cross-sectional and 1-year retrospective study. SETTING:Department of Laboratory Medicine, West China Second University Hospital, Sic...
journal_title:Public health nutrition
pub_type: 杂志文章
doi:10.1017/S1368980013001675
更新日期:2014-04-01 00:00:00
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journal_title:Public health nutrition
pub_type: 杂志文章
doi:10.1017/S136898001100156X
更新日期:2012-03-01 00:00:00
abstract:OBJECTIVE:The present study reviewed the literature on iodine status among women of childbearing age and pregnant women in the UK. Particular attention was given to study quality and methods used to assess iodine status. DESIGN:A systematic review was conducted to examine the literature and critically evaluate study d...
journal_title:Public health nutrition
pub_type: 杂志文章
doi:10.1017/S1368980018003506
更新日期:2018-12-31 00:00:00
abstract:OBJECTIVE:To assess the intake and sources of non-milk extrinsic sugars (NMES) and fat among children in Scotland in relation to socio-economic status, and to estimate the changes in diet required to achieve recommended levels of intake. DESIGN:Cross-sectional survey with diet assessed by semi-quantitative FFQ. SETTI...
journal_title:Public health nutrition
pub_type: 杂志文章
doi:10.1017/S1368980009992175
更新日期:2010-08-01 00:00:00
abstract:OBJECTIVE:Previous studies evaluating the associations of circulating Zn and Se levels with asthma have produced inconsistent results. Therefore, we conducted a meta-analysis to summarize and quantitatively synthesize the evidence from observational research. DESIGN:Meta-analysis. SETTING:We searched PubMed, Web of S...
journal_title:Public health nutrition
pub_type: 杂志文章,meta分析
doi:10.1017/S1368980019003021
更新日期:2020-06-01 00:00:00
abstract:OBJECTIVE:Perceptions of social-contextual food environments and associated factors that influence food purchases are understudied in American Indian (AI) communities. The purpose of the present study was to: (i) understand the perceived local food environment; (ii) investigate social-contextual factors that influence ...
journal_title:Public health nutrition
pub_type: 杂志文章
doi:10.1017/S1368980019001095
更新日期:2019-10-01 00:00:00
abstract:OBJECTIVE:To assess the contribution of different food groups to total salt purchases and to evaluate the estimated reduction in salt purchases if mandatory maximum salt limits in South African legislation were being complied with. DESIGN:This study conducted a cross-sectional analysis of purchasing data from Discover...
journal_title:Public health nutrition
pub_type: 杂志文章
doi:10.1017/S1368980020005273
更新日期:2020-12-28 00:00:00
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journal_title:Public health nutrition
pub_type: 杂志文章
doi:10.1017/S136898001800277X
更新日期:2019-04-01 00:00:00
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journal_title:Public health nutrition
pub_type: 杂志文章
doi:10.1017/S1368980009990267
更新日期:2009-11-01 00:00:00
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journal_title:Public health nutrition
pub_type: 杂志文章,评审
doi:10.1017/S1368980017001689
更新日期:2017-11-01 00:00:00
abstract:OBJECTIVE:To describe the knowledge, attitudes and practices of type 2 diabetics in Yakeshi City and to assess the effect of implementation of nutritional and eating education in enhancing knowledge and practices regarding a healthy diet. DESIGN:A questionnaire-based survey was conducted with 162 diabetics to determin...
journal_title:Public health nutrition
pub_type: 杂志文章,多中心研究,随机对照试验
doi:10.1017/S1368980013002735
更新日期:2014-10-01 00:00:00
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journal_title:Public health nutrition
pub_type: 杂志文章
doi:10.1017/S1368980018003762
更新日期:2019-04-01 00:00:00
abstract:OBJECTIVE:Previous research on the health transition and nutrition security in black South African households revealed the need for further research among farm workers who belong to the poorest population categories. This article gives an overview of the link between nutrition security, livelihoods and HIV/AIDS in Sout...
journal_title:Public health nutrition
pub_type: 杂志文章
doi:10.1079/phn2005739
更新日期:2005-10-01 00:00:00
abstract:OBJECTIVE:To explore if the secular trend in height is contributing to delay overweight rise among Brazilian adolescents. DESIGN:Changes in BMI mean over time were fitted using linear regression including as independent variables survey year, height, survey-specific income quintiles, age and an interaction term of hei...
journal_title:Public health nutrition
pub_type: 杂志文章
doi:10.1017/S1368980016000203
更新日期:2016-08-01 00:00:00
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journal_title:Public health nutrition
pub_type: 杂志文章
doi:10.1017/S1368980017002877
更新日期:2018-02-01 00:00:00
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journal_title:Public health nutrition
pub_type: 杂志文章
doi:10.1017/S1368980020002414
更新日期:2020-09-11 00:00:00
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journal_title:Public health nutrition
pub_type: 杂志文章
doi:10.1017/S1368980017003500
更新日期:2018-04-01 00:00:00
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journal_title:Public health nutrition
pub_type: 杂志文章
doi:10.1017/S1368980020003808
更新日期:2020-10-29 00:00:00
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journal_title:Public health nutrition
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更新日期:2020-10-13 00:00:00
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journal_title:Public health nutrition
pub_type: 杂志文章,评审
doi:10.1079/phn2001299
更新日期:2002-02-01 00:00:00
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journal_title:Public health nutrition
pub_type: 杂志文章
doi:10.1017/S1368980015002372
更新日期:2016-06-01 00:00:00
abstract:OBJECTIVE:The present study sought to determine the feasibility of an experimental research design to investigate the effects of exposure to magazine advertising on children's food choices. DESIGN:Children were randomized to read either a magazine with food advertisements or a magazine with no food advertisements. The...
journal_title:Public health nutrition
pub_type: 杂志文章,随机对照试验
doi:10.1017/S1368980010002983
更新日期:2011-08-01 00:00:00
abstract:OBJECTIVE:The present study examined the effect of ingredient bundles (i.e. measured ingredients with recipes) and recipe tastings as a strategy to increase the selection of healthy, target foods (kale, brown rice and whole-wheat pasta). DESIGN:Each of the three conditions was tested once per week for three weeks. The...
journal_title:Public health nutrition
pub_type: 杂志文章
doi:10.1017/S1368980019000259
更新日期:2019-06-01 00:00:00
abstract:OBJECTIVE:To validate a fat intake questionnaire (FIQ) developed to assess habitual dietary intake while focusing on the assessment of detailed fatty acid intake including total trans unsaturated fatty acids (TUFA). DESIGN:An 88 food item/food group FIQ was developed using a meal pattern technique. Validation was achi...
journal_title:Public health nutrition
pub_type: 杂志文章
doi:10.1079/phn2005668
更新日期:2005-02-01 00:00:00
abstract:OBJECTIVE:To examine the association between fast-food consumption, diet quality and body weight in a community sample of working adults. DESIGN:Cross-sectional and prospective analysis of anthropometric, survey and dietary data from adults recruited to participate in a worksite nutrition intervention. Participants se...
journal_title:Public health nutrition
pub_type: 杂志文章
doi:10.1017/S1368980015001871
更新日期:2016-04-01 00:00:00
abstract:OBJECTIVE:To examine diet costs in relation to dietary quality and socio-economic position, and to investigate underlying reasons for differences in diet costs. DESIGN:Dietary intake was assessed by a 4 d food diary and evaluated using the 2005 Healthy Eating Index (HEI). National consumer food prices collected by Sta...
journal_title:Public health nutrition
pub_type: 杂志文章
doi:10.1017/S1368980010003642
更新日期:2011-09-01 00:00:00
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journal_title:Public health nutrition
pub_type: 杂志文章
doi:10.1017/S1368980019003756
更新日期:2020-04-01 00:00:00
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journal_title:Public health nutrition
pub_type: 杂志文章,多中心研究
doi:10.1017/S1368980012003977
更新日期:2013-08-01 00:00:00