title: Validity and Reproducibility of a Dietary Questionnaire for Consumption Frequencies of Foods during Pregnancy in the Born in Guangzhou Cohort Study (BIGCS).
abstract: This study aimed to examine the reproducibility and validity of a new food frequency questionnaire (FFQ) used in a birth cohort study to estimate the usual consumption frequencies of foods during pregnancy. The reference measure was the average of three inconsecutive 24 h diet recalls (24 HR) administrated between two FFQs, and the reproducibility was measured by repeating the first FFQ (FFQ1) approximately eight weeks later (FFQ2). A total of 210 pregnant women from the Born in Guangzhou Cohort Study (BIGCS) with full data were included in the analysis. The Spearman's correlation coefficients of FFQ1 and FFQ2 ranged from 0.33 to 0.71. The intraclass correlation coefficients of the two FFQs ranged from 0.22 to 0.71. The Spearman's correlation coefficients of the 24 HR and FFQ2 ranged from 0.23 to 0.62. Cross-classification analysis showed 65.1% of participants were classified into same and contiguous quintiles, while only 3.2% were misclassified into the distant quintiles. Bland-Altman methods showed good agreement for most food groups across the range of frequencies between FFQ1 and FFQ2. Our findings indicated that the reproducibility and validity of the FFQ used in BIGCS for assessing the usual consumption frequencies of foods during pregnancy were acceptable.
authors.affiliation: Division of Birth Cohort Study, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, 9 Junsui Road, Tianhe District, Guangzhou 510623, China. ymyeasy@126.com.
authors.forename: Ming-Yang
authors.initials: MY
authors.lastname: Yuan
authors.affiliation: Division of Birth Cohort Study, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, 9 Junsui Road, Tianhe District, Guangzhou 510623, China. Hjr0703@163.com.
authors.forename: Jian-Rong
authors.initials: JR
authors.lastname: He
authors.affiliation: Division of Birth Cohort Study, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, 9 Junsui Road, Tianhe District, Guangzhou 510623, China. cnnfezx@163.com.
authors.forename: Nian-Nian
authors.initials: NN
authors.lastname: Chen
authors.affiliation: Division of Birth Cohort Study, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, 9 Junsui Road, Tianhe District, Guangzhou 510623, China. lujinhua10@gmail.com.
authors.forename: Jin-Hua
authors.initials: JH
authors.lastname: Lu
authors.affiliation: Division of Birth Cohort Study, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, 9 Junsui Road, Tianhe District, Guangzhou 510623, China. shsy_22@163.com.
authors.forename: Song-Ying
authors.initials: SY
authors.lastname: Shen
authors.affiliation: Division of Birth Cohort Study, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, 9 Junsui Road, Tianhe District, Guangzhou 510623, China. xiaowanqing87@163.com.
authors.forename: Wan-Qing
authors.initials: WQ
authors.lastname: Xiao
authors.affiliation: Division of Birth Cohort Study, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, 9 Junsui Road, Tianhe District, Guangzhou 510623, China. hufang0351083@126.com.
authors.forename: Fang
authors.initials: F
authors.lastname: Hu
authors.affiliation: Division of Birth Cohort Study, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, 9 Junsui Road, Tianhe District, Guangzhou 510623, China. xiaohuiyun1982@126.com.
authors.forename: Hui-Yun
authors.initials: HY
authors.lastname: Xiao
authors.affiliation: Division of Birth Cohort Study, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, 9 Junsui Road, Tianhe District, Guangzhou 510623, China. kiky205@163.com.
authors.forename: Yan-Yan
authors.initials: YY
authors.lastname: Wu
authors.affiliation: Division of Birth Cohort Study, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, 9 Junsui Road, Tianhe District, Guangzhou 510623, China. mountain_xia@163.com.
authors.forename: Xiao-Yan
authors.initials: XY
authors.lastname: Xia
authors.affiliation: Division of Birth Cohort Study, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, 9 Junsui Road, Tianhe District, Guangzhou 510623, China. mzmxly81@163.com.
authors.forename: Yu
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Division of Birth Cohort Study, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, 9 Junsui Road, Tianhe District, Guangzhou 510623, China. mewmewprincess@hotmail.com.
authors.forename: Lan
authors.initials: L
authors.lastname: Qiu
authors.affiliation: Division of Birth Cohort Study, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, 9 Junsui Road, Tianhe District, Guangzhou 510623, China. mywachy@163.com.
authors.forename: Ying-Fang
authors.initials: YF
authors.lastname: Wu
authors.affiliation: Division of Birth Cohort Study, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, 9 Junsui Road, Tianhe District, Guangzhou 510623, China. bighcy@163.com.
authors.forename: Cui-Yue
authors.initials: CY
authors.lastname: Hu
authors.affiliation: Division of Birth Cohort Study, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, 9 Junsui Road, Tianhe District, Guangzhou 510623, China. qxiu0161@163.com.|Department of Neonatal Surgery, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, 9 Junsui Road, Tianhe District, Guangzhou 510623, China. qxiu0161@163.com.
authors.forename: Hui-Min
authors.initials: HM
authors.lastname: Xia
authors.affiliation: Division of Birth Cohort Study, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, 9 Junsui Road, Tianhe District, Guangzhou 510623, China. huimin.xia876001@gmail.com.
authors.forename: Xiu
authors.initials: X
authors.lastname: Qiu
mesh_terms: D000328:Adult; D002681:China; D015331:Cohort Studies; D004032:Diet / Q000208:ethnology; D004034:Diet Surveys; D005260:Female; D005502:Food / Q000145:classification; D005518:Food Preferences / Q000208:ethnology; D006801:Humans; D039382:Maternal Nutritional Physiological Phenomena / Q000208:ethnology; D011247:Pregnancy; D011446:Prospective Studies; D015203:Reproducibility of Results; D057566:Self Report; D018709:Statistics, Nonparametric; D055815:Young Adult
keywords: China; dietary assessment; food frequency questionnaire; pregnant women; validation