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Long term extension of a randomised controlled trial of probiotics using electronic health records.


ABSTRACT: Most randomised controlled trials (RCTs) are relatively short term and, due to costs and available resources, have limited opportunity to be re-visited or extended. There is no guarantee that effects of treatments remain unchanged beyond the study. Here, we illustrate the feasibility, benefits and cost-effectiveness of enriching standard trial design with electronic follow up. We completed a 5-year electronic follow up of a RCT investigating the impact of probiotics on asthma and eczema in children born 2005-2007, with traditional fieldwork follow up to two years. Participants and trial outcomes were identified and analysed after five years using secure, routine, anonymised, person-based electronic health service databanks. At two years, we identified 93% of participants and compared fieldwork with electronic health records, highlighting areas of agreement and disagreement. Retention of children from lower socio-economic groups was improved, reducing volunteer bias. At 5 years we identified a reduced 82% of participants. These data allowed the trial's first robust analysis of asthma endpoints. We found no indication that probiotic supplementation to pregnant mothers and infants protected against asthma or eczema at 5 years. Continued longer-term follow up is technically straightforward.

SUBMITTER: Davies G 

PROVIDER: S-EPMC5955897 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature

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Long term extension of a randomised controlled trial of probiotics using electronic health records.

Davies Gareth G   Jordan Sue S   Brooks Caroline J CJ   Thayer Daniel D   Storey Melanie M   Morgan Gareth G   Allen Stephen S   Garaiova Iveta I   Plummer Sue S   Gravenor Mike M  

Scientific reports 20180516 1


Most randomised controlled trials (RCTs) are relatively short term and, due to costs and available resources, have limited opportunity to be re-visited or extended. There is no guarantee that effects of treatments remain unchanged beyond the study. Here, we illustrate the feasibility, benefits and cost-effectiveness of enriching standard trial design with electronic follow up. We completed a 5-year electronic follow up of a RCT investigating the impact of probiotics on asthma and eczema in child  ...[more]

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