Validation of a food frequency questionnaire to determine vitamin <scp>D</scp> intakes using the method of triads

Weir, R. R.; Carson, Emma; Mulhern, Maria S.; Laird, Éamon; Healy, Martin; Pourshahidi, L.K.

doi:10.1111/jhn.12328

Cited by 32 publications

(51 citation statements)

References 31 publications

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“…A validated food frequency questionnaire was used to estimate the habitual dietary intake of vitamin D once a year . The questionnaire comprised of 17 questions pertaining to 13 food groups which contribute to dietary intake of vitamin D, including milk and dairy products, fish, and dietary supplements.…”

Section: Methodsmentioning

confidence: 99%

Conjunctival ultraviolet autofluorescence area, but not intensity, is associated with myopia

Kearney

O’Donoghue

Pourshahidi

et al. 2019

Clinical and Experimental Optometry

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Section: Methodsmentioning

confidence: 99%

Conjunctival ultraviolet autofluorescence area, but not intensity, is associated with myopia

Kearney

O’Donoghue

Pourshahidi

et al. 2019

Clinical and Experimental Optometry

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“…In order to estimate dietary vitamin D intake, footballers completed a validated food frequency questionnaire (FFQ) [49]. These data were collected on a single occasion due to the negligible contribution of dietary sources to total 25(OH)D concentration and the low intake of such foods in the Western diet [50, 51], despite a growing range of vitamin D-fortified products.…”

Section: Experimental Methodsmentioning

confidence: 99%

Vitamin D3 supplementation using an oral spray solution resolves deficiency but has no effect on VO2 max in Gaelic footballers: results from a randomised, double-blind, placebo-controlled trial

et al. 2016

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Purpose Vitamin D inadequacy is a global health concern in athletes as well as the general population. Whilst the role of vitamin D in skeletal health is well defined, there remains uncertainty over whether vitamin D supplementation has an added benefit beyond bone health.MethodsThis randomised placebo-controlled trial in healthy male and female Gaelic footballers (n = 42) investigated the effect of vitamin D3 supplementation [3000 IU (75 µg) daily for 12 weeks, via an oral spray solution] on VO2 max which was the primary outcome measure. Secondary outcomes included skeletal muscle and lung function.ResultsSupplementation significantly increased total 25-hydroxyvitamin D concentrations compared to the placebo group (mean ± SD change from baseline, 36.31 ± 32.34 vs. 6.11 ± 23.93 nmol/L, respectively; P = 0.006). At baseline, 50 and 22 % of footballers presented with vitamin D insufficiency (31–49 nmol/L) and deficiency (<30 nmol/L), respectively. Total 25-hydroxyvitamin D concentration did not significantly correlate with any measure of physical performance. Analysis of covariance (ANCOVA) models demonstrated that vitamin D supplementation over 12 weeks had no significant effect on VO2 max (P = 0.375), vertical jump height (P = 0.797), left and right handgrip strength (P = 0.146 and P = 0.266, respectively), forced vital capacity (P = 0.573) or forced expiratory volume at 1 s (P = 0.665), after adjusting for confounders. The high prevalence of vitamin D inadequacy observed in this cohort of collegiate Gaelic footballers supports the need for vitamin D supplementation during wintertime to avoid being at risk of poor bone health.ConclusionsTwelve-week daily supplementation with 3000 IU (75 µg) vitamin D3 successfully resolved deficiency but did not have any significant effect on VO2 max, skeletal muscle or lung function.

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“…n 49 (35) ). This may lead to an erroneous acceptance of the null hypothesis due to limited power to detect a difference in the traditional hypothesis test (i.e.…”

Section: Discussionmentioning

confidence: 99%

Improved interpretation of studies comparing methods of dietary assessment: combining equivalence testing with the limits of agreement

et al. 2016

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The aim of this study was to demonstrate the use of testing for equivalence in combination with the Bland and Altman method when assessing agreement between two dietary methods. A sample data set, with eighty subjects simulated from previously published studies, was used to compare a FFQ with three 24 h recalls (24HR) for assessing dietary I intake. The mean I intake using the FFQ was 126·51 (SD 54·06) µg and using the three 24HR was 124·23 (SD 48·62) µg. The bias was −2·28 (SD 43·93) µg with a 90 % CI 10·46, 5·89 µg. The limits of agreement (LOA) were −88·38, 83·82 µg. Four equivalence regions were compared. Using the conventional 10 % equivalence range, the methods are shown to be equivalent both by using the CI (−12·4, 12·4 µg) and the two one-sided tests approach (lower t = −2·99 (79 df), P = 0·002; upper t = 2·06 (79 df), P = 0·021). However, we make a case that clinical decision making should be used to set the equivalence limits, and for nutrients where there are potential issues with deficiency or toxicity stricter criteria may be needed. If the equivalence region is lowered to ±5 µg, or ±10 µg, these methods are no longer equivalent, and if a wider limit of ±15 µg is accepted they are again equivalent. Using equivalence testing, acceptable agreement must be assessed a priori and justified; this makes the process of defining agreement more transparent and results easier to interpret than relying on the LOA alone.

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Validation of a food frequency questionnaire to determine vitamin D intakes using the method of triads

Abstract: The method of triads was applied using these three measurements to determine the overall validity of the FFQ. Results: Vitamin D intakes from 4d-WFR ranged between 0.42 and 31.65 lg day À1 , whereas intakes determined from the FFQ ranged from

Cited by 32 publications

References 31 publications

Conjunctival ultraviolet autofluorescence area, but not intensity, is associated with myopia

Conjunctival ultraviolet autofluorescence area, but not intensity, is associated with myopia

Vitamin D3 supplementation using an oral spray solution resolves deficiency but has no effect on VO2 max in Gaelic footballers: results from a randomised, double-blind, placebo-controlled trial

Improved interpretation of studies comparing methods of dietary assessment: combining equivalence testing with the limits of agreement

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