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 language | English |
|---|---|
| Pages (from-to) | 179-190 |
| Number of pages | 12 |
| Journal | Malaysian Journal of Nutrition |
| Volume | 21 |
| Issue number | 2 |
| Publication status | Published - 2015 |
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Keywords
- FFQ
- Malaysia
- Pregnant women
- Reliability
- Validation
- Vitamin D
ASJC Scopus subject areas
- Nutrition and Dietetics
- Food Science
Cite this
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 journal › Article
}
TY - JOUR
T1 - Development and validation of a food frequency questionnaire for vitamin D intake among urban pregnant women in Malaysia
AU - Md Isa, Zaleha
AU - Shamsuddin, Khadijah
AU - Noriklil Bukhary, I. B.
AU - Khor, G. L.
AU - Abdullah Mahdy, Zaleha
AU - Haslinda, H.
AU - Noor Sharifatul Hana, Y.
AU - Hasanain Faisal, G.
PY - 2015
Y1 - 2015
N2 - 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.
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.
KW - FFQ
KW - Malaysia
KW - Pregnant women
KW - Reliability
KW - Validation
KW - Vitamin D
UR - http://www.scopus.com/inward/record.url?scp=84947338239&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84947338239&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:84947338239
VL - 21
SP - 179
EP - 190
JO - Malaysian Journal of Nutrition
JF - Malaysian Journal of Nutrition
SN - 1394-035X
IS - 2
ER -