Validity and reproducibility of a self-administered questionnaire to determine dietary supplement users among Japanese

Ishihara, Junko; Sobue, T; Yamamoto, Shun; Sasaki, Satoshi; Akabane, Masayuki; Tsugane, Shoichiro

doi:10.1038/sj.ejcn.1601164

Cited by 24 publications

(28 citation statements)

References 15 publications

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“…This was true also for Dorant et al, who reported a PPV of 96.4% and a NPV of 82.7% (Dorant et al, 1994). In contrast to our data, Ishihara et al showed a higher NPV (97.2%) than PPV (64.3%) (Ishihara et al, 2001).…”

Section: Discussioncontrasting

confidence: 55%

“…Two previous studies, one in the Netherlands and one in Japan, have reported a slightly lower overall sensitivity (65.9 and 75.0%, respectively) with a prevalence of 25.7% dietary supplement users among participants in the study from the Netherlands and 10% a year-round dietary supplement use in the Japanese study (Dorant et al, 1994;Ishihara et al, 2001). The overall specificity in these two studies was 98.5 and 95.4%, respectively.…”

Section: Discussionmentioning

confidence: 87%

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Sensitivity and specificity of self-reported use of dietary supplements

Messerer¹,

Wolk²

2004

Eur J Clin Nutr

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Objective: To evaluate the sensitivity and specificity of a self-administered food frequency questionnaire (FFQ)-used in a cohort of 48 000 men to determine dietary supplement use. Design: Questionnaire data regarding use of dietary supplements were compared with 14 24-h recall interviews spread over a year. Setting and subjects: A random sample of 248 middle-aged and elderly Swedish men was included in the analysis. Results and conclusions: Use of any supplement in at least one interview was reported by 51% (in three or more interviews by 38%). Sensitivity and specificity of the FFQ regarding any supplement use was 78 and 93%, respectively. Sensitivity for multivitamins, vitamins C and E was 69, 67 and 78%, respectively. The sensitivity increased to 93% and the specificity decreased to 88% when a user was defined as a person reporting use in at least three interviews. Conclusions: Dietary supplement use might be measured by a self-administered questionnaire relatively well especially when supplements are used more regularly.

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Section: Discussioncontrasting

confidence: 55%

Section: Discussionmentioning

confidence: 87%

Sensitivity and specificity of self-reported use of dietary supplements

Messerer¹,

Wolk²

2004

Eur J Clin Nutr

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“…Therefore, the lack of awareness of children's supplements may be one reason for the low prevalence of children's supplement use in this survey. The supplement use by adults in the United States has been increasing (19,(29)(30)(31) and similar trends, although somewhat delayed, have been observed in Japan (7)(8)(9). The parents who were aware of the existence of children's supplements generally displayed an affirmative approach to children's supplement use.…”

Section: Discussionmentioning

confidence: 80%

“…The number of adult supplement users in Japan has recently become larger and larger, as in the United States and other developed countries (7)(8)(9)(10). According to recent studies in various areas of Japan, 55% of men and 61% of women have used supplements ( 10 ).…”

mentioning

confidence: 99%

Use of Dietary Supplements among Preschool Children in Japan

Sato

Yamagishi

Hashimoto

et al. 2009

J Nutr Sci Vitaminol

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Summary This study was conducted to examine the characteristics and use of dietary supplements by preschool children in Japan. A survey was conducted among 2,125 parents of preschool children to discover the status of dietary supplement use and their attitudes towards supplement use by their children. Logistic regression models were used to determine which characteristics predict supplement use in this population. For detailed characterization, child supplement users were also categorized as either the users of vitamins and minerals only or the users of other supplement components. For parents of non-user children, the parent's knowledge and attitudes toward supplements for children were investigated. Fifteen percent of children had used dietary supplements. Two parent-related factors were especially important, the frequency with which they referred to nutritional labels and their own supplement use, which had a significant encouraging effect on their children's supplement use. The parents of child supplement users showed limited awareness of the government system concerning diet and food, placed safety over efficacy, selected products with natural ingredients, and did not seek consultations with professionals. These parents, especially those who were aware of the specially designed supplements for children, exhibited positive responses to supplement use by their children. It is likely that parents' knowledge and attitudes toward dietary supplements and nutrition have a striking effect on their children's use of supplements. Unfortunately, their knowledge at present was less than satisfactory. More accurate information on nutrition, dietary intake and dietary supplements must be disseminated.

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“…Assessment of supplement use by the food frequency questionnaire is also reliable. 18,19 Participants typically returned food frequency questionnaires every 4 years during the follow-up period (1984( , 1986( , 1994( , and 19981991 and1995 in NHS II;1986, 1994, and 1998 in HPFS), and vitamin D intake was reset for each participant at each of these time points according to the most recent level of intake.…”

Section: Assessment Of Vitamin D Intakementioning

confidence: 99%

Vitamin D Intake and Risk of Incident Hypertension

et al. 2005

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Abstract-Emerging evidence suggests an inverse relation between vitamin D and blood pressure. We examined the independent association between intake of vitamin D and the risk of incident hypertension among participants of 3 large and independent prospective cohorts: Nurses Health Study I (NHS I; nϭ77 436), NHS II (nϭ93 803), and Health Professionals' Follow-up Study (HPFS; nϭ38 074). Relative risks and 95% confidence intervals for incident hypertension were computed according to quintiles of vitamin D intake using Cox proportional hazards regression and adjusted for relevant covariates. Each cohort was followed for Ն8 years. Vitamin D intake was not associated with the risk of developing hypertension. Growing evidence points to vitamin D as having an important association with blood pressure. Data from animal studies implicate circulating active vitamin D as an inhibitor of renin expression in the juxtaglomerular apparatus as well as an inhibitor of vascular smooth muscle cell proliferation. 3,4 Oral supplementation with vitamin D lowers blood pressure in hypertensive rats. [5][6][7] In humans, cross-sectional data suggest an association between low vitamin D intake (Ͻ400 IU per day) and higher blood pressure, 8 and a single interventional study in vitamin D-deficient elderly women found that a combination of calcium and vitamin D supplementation had a greater blood pressure-lowering effect than calcium supplementation alone. 9 However, there are no prospective data in the general population that higher vitamin D intake lowers the risk of hypertension.To determine whether higher vitamin D intake is associated with a lower risk of incident hypertension, we analyzed data from 3 large prospective cohort studies that together comprised Ͼ200 000 participants from the 2 Nurses' Health Studies and the Health Professionals' Follow-up Study (HPFS). Methods Study PopulationsThe older cohort of women (Nurses' Health Study I [NHS I]) was assembled in 1976, when 121 700 female nurses 30 to 55 years of age returned an initial questionnaire. 10 The younger cohort of women (NHS II) was assembled in 1989, when 116 671 female registered nurses 25 to 42 years of age returned a mailed questionnaire. 11 In 1986, 51 529 male health professionals 40 to 75 years of age who returned an initial questionnaire were enrolled (HPFS). 12 Subsequent questionnaires have been mailed every 2 years to update information on health-related behavior and medical events. Detailed dietary information was collected every 4 years using a semiquantitative food frequency questionnaire. 13 The assembly of the 3 populations for the purpose of this study is outlined in the Figure. Assessment of Vitamin D IntakeThe semiquantitative food frequency questionnaire asks about commonly used portion sizes of various foods and prompts participants to record the frequency of consumption during the previous year, with 9 potential response categories ranging from less than once per month to Ն6 times per day; this questionnaire has been validated in these as well as sever...

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Validity and reproducibility of a self-administered questionnaire to determine dietary supplement users among Japanese

Cited by 24 publications

References 15 publications

Sensitivity and specificity of self-reported use of dietary supplements

Sensitivity and specificity of self-reported use of dietary supplements

Use of Dietary Supplements among Preschool Children in Japan

Vitamin D Intake and Risk of Incident Hypertension

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