Online self-administered data collection, by reducing the logistic burden and cost, could advantageously replace classical methods based on dietitian's interviews when assessing dietary intake in large epidemiological studies. Studies comparing such new instruments with traditional methods are necessary. Our objective was to compare one NutriNet-Santé web-based self-administered 24 h dietary record with one 24 h recall carried out by a dietitian. Subjects completed the web-based record, which was followed the next day by a dietitianconducted 24 h recall by telephone (corresponding to the same day and using the same computerised interface for data entry). The subjects were 147 volunteers aged 48 -75 years (women 59·2 %). The study was conducted in February 2009 in France. Agreement was assessed by intraclass correlation coefficients (ICC) for foods and energy-adjusted Pearson's correlations for nutrients. Agreement between the two methods was high, although it may have been overestimated because the two assessments were consecutive to one another. Among consumers only, the median of ICC for foods was 0·8 in men and 0·7 in women (range 0·5-0·9). The median of energy-adjusted Pearson's correlations for nutrients was 0·8 in both sexes (range 0·6-0·9). The mean Pearson correlation was higher in subjects # 60 years (P¼ 0·02) and in those who declared being 'experienced/expert' with computers (P¼0·0003), but no difference was observed according to educational level (P¼ 0·12). The mean completion time was similar between the two methods (median for both methods: 25 min). The web-based method was preferred by 66·1 % of users. Our web-based dietary assessment, permitting considerable logistic simplification and cost savings, may be highly advantageous for large population-based surveys. Key words: Comparative study: Dietary records: Internet: InterviewCollection of high-quality dietary data in large populations is a priority challenge in nutritional epidemiology. Usual methods for measuring food and nutrient intakes (food records, 24 h recalls, dietary history and FFQ) are based on self-administered questionnaires or interviews by trained dietitians. These methods are complex and costly, requiring substantial logistic resources when applied to large populations (1) . Over the past few decades, new technologies have been developed to enhance accuracy, increase speed and minimise the cost and inconvenience of assessing dietary intake. The use of information and communication technologies for dietary assessment has recently been reviewed (1 -3) . Those reviews stated that new methods hold promise as novel, high-quality, costefficient tools. However, several limitations in previously published validation and comparison studies were identified: many were based on a small sample size (less than 100 subjects), focused on relatively young populations and examined a restricted range of nutrients (mainly macronutrients). Therefore, research into validating technology-based applications for dietary assessment in a variety o...
Online data collection could advantageously replace paper-and-pencil questionnaires in epidemiological studies by reducing the logistic burden, the cost and the duration of data processing. However, there is a need for studies comparing these new instruments to traditional ones. Our objective was to compare the web-based version of the NutriNet-Santé self-administered anthropometric questionnaire to the paper-based version. The questionnaire included 17 questions divided into subquestions (55 variables in all) dealing with height, weight, hip and waist circumferences, weight history, restrictive diet and weight self-perception. Both versions of the questionnaire were filled out by 147 volunteers (paper version first, N = 76, or web-based version first, N = 71) participating in the SU.VI.MAX (''Supplémentation en VItamines Minéraux et AntioXydants'') cohort (age-range: 49-75 years; men: 46.3%). At the end of the test, subjects filled in a ''satisfaction'' questionnaire giving their opinions and feelings about each version. Agreement was assessed by intraclass correlation coefficients (ICCs) and kappas. We also quantified the number of errors inherent in the paper version.Agreement between the two versions was high. ICCs ranged from 0.86 to 1.00. Kappas ranged from 0.69 to 1.00 for comparable variables. A total of 82 data entry mistakes (1.5% of total entries), 60 missing values (1.1%), 57 inconsistent values (1.1%) and 3 abnormal values (0.1%) were counted in the paper version (non-existent in the webbased version due to integrated controls). The web-based version was preferred by 92.2% of users. In conclusion, the quality of information provided by the web-based anthropometric questionnaire used in the NutriNet-Santé Study was equal to, or better than, that of the paper version, with substantial logistic and cost advantages.
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