Development and validation of a food frequency questionnaire for vitamin D intake among urban pregnant women in Malaysia

Zaleha Md Isa, Khadijah Shamsuddin, I. B. Noriklil Bukhary, G. L. Khor, Zaleha Abdullah Mahdy, H. Haslinda, Y. Noor Sharifatul Hana, G. Hasanain Faisal

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Introduction: A culturally valid tool is lacking in order to assess vitamin D intake among Malaysians. This study aimed to develop and determine the validity and reliability of a semi-quantitative food frequency questionnaire (FFQ) for assessment of vitamin D intake among pregnant women living in urban areas of Malaysia. Methods: A total of 79 volunteer mothers (aged 18 to 40 years) in their fi rst trimester of pregnancy participated in this study voluntarily. They completed both the 3-day 24-hour dietary recalls (3DR) and semi-quantitative food frequency questionnaires (FFQ1). The FFQ1 was validated against vitamin D intake calculated from the 3DR. After one week, 41 (51.89%) subjects completed the same FFQ1 (now called FFQ2) for reliability assessment. Results: The median vitamin D intake from 3DR was 117.6 IU/day with an interquartile range (IQR) of 54.8 to 193.7 IU/ day. The median and IQR values from FFQ1 were 147.7 and 103.7 to 233.9 IU/ day, respectively. The Spearman correlation coeffi cient was strong and positive, r=0.810 (p=0.01); cross-classifi cation analyses revealed no misclassifi cation and the Bland-Altman plot showed good agreement between the two dietary methods. The intra-class correlation (ICC) for reliability of vitamin D intake was 0.98; the cross-classifi cation analysis showed 95.12% and was classifi ed into the same quartile which supported a consistent habitual eating pattern. Conclusion: The new FFQ developed to assess vitamin D intake showed high correlation and high agreement with the majority of the sample population classifi ed into the same quartile. It is concluded that the new FFQ is a valid and reliable screening tool for vitamin D intake for pregnant women in the urban areas of Malaysia.

Original languageEnglish
Pages (from-to)179-190
Number of pages12
JournalMalaysian Journal of Nutrition
Volume21
Issue number2
Publication statusPublished - 2015

Fingerprint

Malaysia
food frequency questionnaires
pregnant women
vitamin D
Vitamin D
Pregnant Women
Food
diet recall
Cations
cations
urban areas
Pregnancy Trimesters
Cholecalciferol
Reproducibility of Results
Surveys and Questionnaires
Volunteers
eating habits
volunteers
Eating
Mothers

Keywords

  • FFQ
  • Malaysia
  • Pregnant women
  • Reliability
  • Validation
  • Vitamin D

ASJC Scopus subject areas

  • Nutrition and Dietetics
  • Food Science

Cite this

Md Isa, Z., Shamsuddin, K., Noriklil Bukhary, I. B., Khor, G. L., Abdullah Mahdy, Z., Haslinda, H., ... Hasanain Faisal, G. (2015). Development and validation of a food frequency questionnaire for vitamin D intake among urban pregnant women in Malaysia. Malaysian Journal of Nutrition, 21(2), 179-190.

Development and validation of a food frequency questionnaire for vitamin D intake among urban pregnant women in Malaysia. / Md Isa, Zaleha; Shamsuddin, Khadijah; Noriklil Bukhary, I. B.; Khor, G. L.; Abdullah Mahdy, Zaleha; Haslinda, H.; Noor Sharifatul Hana, Y.; Hasanain Faisal, G.

In: Malaysian Journal of Nutrition, Vol. 21, No. 2, 2015, p. 179-190.

Research output: Contribution to journalArticle

Md Isa, Z, Shamsuddin, K, Noriklil Bukhary, IB, Khor, GL, Abdullah Mahdy, Z, Haslinda, H, Noor Sharifatul Hana, Y & Hasanain Faisal, G 2015, 'Development and validation of a food frequency questionnaire for vitamin D intake among urban pregnant women in Malaysia', Malaysian Journal of Nutrition, vol. 21, no. 2, pp. 179-190.
Md Isa, Zaleha ; Shamsuddin, Khadijah ; Noriklil Bukhary, I. B. ; Khor, G. L. ; Abdullah Mahdy, Zaleha ; Haslinda, H. ; Noor Sharifatul Hana, Y. ; Hasanain Faisal, G. / Development and validation of a food frequency questionnaire for vitamin D intake among urban pregnant women in Malaysia. In: Malaysian Journal of Nutrition. 2015 ; Vol. 21, No. 2. pp. 179-190.
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abstract = "Introduction: A culturally valid tool is lacking in order to assess vitamin D intake among Malaysians. This study aimed to develop and determine the validity and reliability of a semi-quantitative food frequency questionnaire (FFQ) for assessment of vitamin D intake among pregnant women living in urban areas of Malaysia. Methods: A total of 79 volunteer mothers (aged 18 to 40 years) in their fi rst trimester of pregnancy participated in this study voluntarily. They completed both the 3-day 24-hour dietary recalls (3DR) and semi-quantitative food frequency questionnaires (FFQ1). The FFQ1 was validated against vitamin D intake calculated from the 3DR. After one week, 41 (51.89{\%}) subjects completed the same FFQ1 (now called FFQ2) for reliability assessment. Results: The median vitamin D intake from 3DR was 117.6 IU/day with an interquartile range (IQR) of 54.8 to 193.7 IU/ day. The median and IQR values from FFQ1 were 147.7 and 103.7 to 233.9 IU/ day, respectively. The Spearman correlation coeffi cient was strong and positive, r=0.810 (p=0.01); cross-classifi cation analyses revealed no misclassifi cation and the Bland-Altman plot showed good agreement between the two dietary methods. The intra-class correlation (ICC) for reliability of vitamin D intake was 0.98; the cross-classifi cation analysis showed 95.12{\%} and was classifi ed into the same quartile which supported a consistent habitual eating pattern. Conclusion: The new FFQ developed to assess vitamin D intake showed high correlation and high agreement with the majority of the sample population classifi ed into the same quartile. It is concluded that the new FFQ is a valid and reliable screening tool for vitamin D intake for pregnant women in the urban areas of Malaysia.",
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AU - Shamsuddin, Khadijah

AU - Noriklil Bukhary, I. B.

AU - Khor, G. L.

AU - Abdullah Mahdy, Zaleha

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AB - Introduction: A culturally valid tool is lacking in order to assess vitamin D intake among Malaysians. This study aimed to develop and determine the validity and reliability of a semi-quantitative food frequency questionnaire (FFQ) for assessment of vitamin D intake among pregnant women living in urban areas of Malaysia. Methods: A total of 79 volunteer mothers (aged 18 to 40 years) in their fi rst trimester of pregnancy participated in this study voluntarily. They completed both the 3-day 24-hour dietary recalls (3DR) and semi-quantitative food frequency questionnaires (FFQ1). The FFQ1 was validated against vitamin D intake calculated from the 3DR. After one week, 41 (51.89%) subjects completed the same FFQ1 (now called FFQ2) for reliability assessment. Results: The median vitamin D intake from 3DR was 117.6 IU/day with an interquartile range (IQR) of 54.8 to 193.7 IU/ day. The median and IQR values from FFQ1 were 147.7 and 103.7 to 233.9 IU/ day, respectively. The Spearman correlation coeffi cient was strong and positive, r=0.810 (p=0.01); cross-classifi cation analyses revealed no misclassifi cation and the Bland-Altman plot showed good agreement between the two dietary methods. The intra-class correlation (ICC) for reliability of vitamin D intake was 0.98; the cross-classifi cation analysis showed 95.12% and was classifi ed into the same quartile which supported a consistent habitual eating pattern. Conclusion: The new FFQ developed to assess vitamin D intake showed high correlation and high agreement with the majority of the sample population classifi ed into the same quartile. It is concluded that the new FFQ is a valid and reliable screening tool for vitamin D intake for pregnant women in the urban areas of Malaysia.

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