Vitamin D of Chinese Children and Adolescents

Completed

• Conditions: Vitamin D Deficiency

• Registration Number: NCT03221972
• Lead Sponsor: Lichen Yang

Brief Summary

The aim of this study was to assess the vitamin D status and analyze risk factors for vitamin D inadequacy of Chinese children and adolescents aged 6-17y.

Detailed Description

In this study, we analyzed the vitamin D status of Chinese children and adolescents aged 6-17y, and related risk factors (such as gender, region strata, ambient UVB level at area of residence, season, and outdoor time, etc.). Serum 25 hydroxyvitamin D \[25(OH)D\] was measured with a radioimmunoassay kit in 15 000 children and adolescent participants in Chinese national nutrition and health survey (CNNHS) 2010-2012. Age, gender, region type, ethnicity, outdoor time, vitamin D supplementation were recorded in unified design questionnaires. Season was recorded by the date of blood taken; location was divided into north and south by China's Qinling mountains and Huaihe river; and ambient ultraviolet B (UVB) radiation level was classified according to the corresponding dose of each participant living area from National Aeronautics and Space Administration data.

Study Timeline

• Study Start: 2010-01-01
• Primary Completion: 2013-12-30
• Study Completion: 2016-10-30
• Status Verified: 2017-07
• Study First Submitted: 2017-07-12
• Study First Submitted QC: 2017-07-18
• Last Update Submitted: 2017-07-18
• Study First Posted: 2017-07-19
• Last Update Posted: 2017-07-19

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 15000

Inclusion Criteria

Participanted in China national nutrition and health survey (CNNHS) 2010-2012; Aged 6-17 years; Had blood taken;

Exclusion Criteria

No.

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
25 hydroxyvitamin D	through study completion, an average of 1 year	To describe the vitamin D status,ng/mL.

Secondary Outcome Measures

Name	Time	Method
Environmental data	up to 25 weeks	season,region type, latitude, ambient ultraviolet B radiation level
Outdoor time	through study completion, an average of 1 year	outdoor activity time
Demographic data	through study completion, an average of 1 year	age, gender, ethnicity
Vitamin D supplementation	through study completion, an average of 1 year	frequency of vitamin D supplements taking for each participant

Trial Locations

Locations (1)

National Institute for Nutrition and Health, China CDC; 🇨🇳 Beijing, Beijing, China