Between January 2013 and June 2014, families were recruited at Kätilöopisto Helsinki Maternity Hospital, Helsinki, Finland. The primary outcomes were bone strength and incidence of parent-reported infections. Secondary outcomes included child growth and development, and incidence of asthma and allergies. Main results have been published (see publications).
We have completed a VIDI follow-up study (VIDI2) when the children were 6 to 7 years of age during 2019-2021. Main aim of the follow-up study is to investigate long-term health consequences of early childhood vitamin D intervention. Data processing and analyzing is currently ongoing.
Study is carried out by HUS Helsinki University Hospital together with University of Helsinki, in a collaboration with Folkhälsan Research Center and Karolinska Institutet.