Reporting missing participant data in randomised trials: systematic survey of the methodological literature and a proposed guideby Akl et al 2016
Authors conducted a systematic survey of the methodological literature to identify recommended approaches for how and what randomised clinical trial (RCT) authors should report on missing participant data and, on the basis of these approaches, to propose guidance for RCT authors. Most identified approaches invite trial authors to report the extent of MPD and the underlying reasons. Fewer approaches focus on reporting missingness patterns, methods for handling MPD and implications of MPD on results.
Professor Mike English explains how KEMRI-Wellcome are ''working with government to generate patient level data from a network of Kenyan hospitals as a platform for research'.
In celebration of Global Health Trials' fifth birthday (May 11th 2015) Professor Trudie Lang, Principal Investigator of the programme, talks to us about why Global Health Trials was started, why people should share their experience, and what the future holds.
Systematic reviews on selected nutrition interventions: descriptive assessment of conduct and methodological challengesby Rehana A Salam
Rigorous and transparent systematic reviews are recognized internationally as a credible source for evidence of effectiveness. However, in the field of nutrition, despite attempts at developing consensus on actions and interventions to reduce undernutrition and micronutrient deficiencies, there is lack of coordination among various groups. Each of these methodological choices influences the findings of the reviews, and lack of standardization across these domains increases the complexity for users of systematic reviews in interpreting results. There is a need to develop a consensus on methodologies for nutrition reviews, criteria for assessing the evidence and possibly facilitating development and collation of the evidence in the subject area.
Translating research into practice: the introduction of the INTERGROWTH-21st package of clinical standards, tools and guidelines into policies, programmes and servicesby INTERGROWTH-21st
This paper describes the approach to translating the findings, tools and resources generated by the INTERGROWTH-21st Project into practice. http://onlinelibrary.wiley.com/doi/10.1111/1471-0528.12416/abstract
A rapid questionnaire assessment of environmental exposures to pregnant women in the INTERGROWTH-21st Projectby INTERGROWTH-21st
Impaired fetal growth and preterm birth are the leading causes of neonatal and infant mortality worldwide and there is a growing scientific literature suggesting that environmental exposures during pregnancy may play a causal role in these outcomes. This paper describes the creation of a global tool for screening pregnant women for environmental exposures in the Fetal Growth Longitudinal Study, a component of the INTERGROWTH-21st Project. http://onlinelibrary.wiley.com/doi/10.1111/1471-0528.12430/abstract
This paper describes the implementation of the INTERGROWTH-21st Project in Seattle, USA. http://onlinelibrary.wiley.com/doi/10.1111/1471-0528.12126/abstract
This paper describes the implementation of the INTERGROWTH-21st Project in Oxford, UK. http://onlinelibrary.wiley.com/doi/10.1111/1471-0528.12033/abstract
This paper describes the implementation of the INTERGROWTH-21st Project in Muscat, Oman. http://onlinelibrary.wiley.com/doi/10.1111/1471-0528.12043/abstract
This paper describes the implementation of the INTERGROWTH-21st Project in Nairobi, Kenya. http://onlinelibrary.wiley.com/doi/10.1111/1471-0528.12045/abstract
This paper describes the implementation of the INTERGROWTH-21st Project in Turin, Italy. http://onlinelibrary.wiley.com/doi/10.1111/1471-0528.12124/abstract
This paper describes the implementation of the INTERGROWTH-21st Project in Nagpur, India. http://onlinelibrary.wiley.com/doi/10.1111/1471-0528.12058/abstract
This paper describes the implementation of the INTERGROWTH-21st Project in Beijing, China. http://onlinelibrary.wiley.com/doi/10.1111/1471-0528.12044/abstract
This paper describes the implementation of the INTERGROWTH-21st Project in Pelotas, Brazil. http://onlinelibrary.wiley.com/doi/10.1111/1471-0528.12046/abstract
The INTERGROWTH-21st Project presented a complex set of ethical challenges given the involvement of health institutions in geographically and culturally diverse areas of the world, with differing attitudes to pregnancy. This paper addresses how the research team dealt with some of those issues. http://onlinelibrary.wiley.com/doi/10.1111/1471-0528.12030/abstract
Statistical considerations for the development of prescriptive fetal and newborn growth standards in the INTERGROWTH-21st Projectby INTERGROWTH-21st
This paper considers the statistical aspects of the three components of the INTERGROWTH-21st Project - the Fetal Growth Longitudinal Study, the Preterm Postnatal Follow-up Study, and the Newborn Corss-Sectional Study - as they relate to the construction of the INTERGROWTH-21st standards, in particular, the sample size. http://onlinelibrary.wiley.com/doi/10.1111/1471-0528.12031/abstract
The INTERGROWTH-21st Project data management was structured incorporating both a centralise and decentralised system for the eight study centres, which all used the same database and standardised data collection instruments, manual and processes. This paper describes the data collection, entry and management processes that ensure that the data collected in the INTERGROWTH-21st Project were of exceptionally high quality. http://onlinelibrary.wiley.com/doi/10.1111/1471-0528.12080/abstract
Given the multicentre nature of the INTERGROWTH-21st Project and the expected number of preterm births, it is vital that all centres follow the same standardised clinical care protocols to assess and manage preterm infants, so as to ensure maximum validity of the resulting standards as indicators of growth and nutrition with minimal confounding. Moreover, it is well known that evidence-based clinical practice guidelines can reduce the delivery of inappropriate care and support the introduction of new knowledge into clinical practice. The INTERGROWTH-21st Neonatal Group produced an operations manual, which reflects the consensus reached by members of the group regarding standardised definitions of neonatal morbidities and the minimum standards of care to be provided by all centres taking part in the project. This paper describes the process of developing the Basic Neonatal Care Manual, as well as the morbidity definitions and standardised neonatal care protocols applied across all the INTERGROWTH-21st participating centres. Thoughts about implementation strategies are presented. http://onlinelibrary.wiley.com/doi/10.1111/1471-0528.12312/abstract
Anthropometric standardisation and quality control protocols for the construction of new, international, fetal and newborn growth standards: the INTERGROWTH-21st Projectby INTERGROWTH-21st
The INTERGROWTH-21st Project involved taking anthropometric measurements, including head circumference, recumbent length and weight of infants, and the stature and weight of parents. In a large, international, multicentre project, it is critical that all study sites follow standardised protocols to ensure maximal validity of the growth and nutrition indicators used. This paper describes, in detal, the anthropometric training, standardisation and quality control procedures used to collect data for these new standards. http://onlinelibrary.wiley.com/doi/10.1111/1471-0528.12127/abstract
Anthropometric protocols for the construction of new international fetal and newborn growth standards: the INTERGROWTH-21st Projectby INTERGROWTH-21st
The INTERGROWTH-21st Project involved taking anthropometric measurements, including head circumference, recumbent length and weight of infants, and the stature and weight of parents. In a large, international, multicentre project, it is critical that all study sites follow standardised protocols to ensure maximal validity of the growth and nutrition indicators used. This paper describes, in detal, the selection of anthropometric personnel, equipment, measurement and calibration protocols used to construct the new INTERGROWTH-21st standards. http://onlinelibrary.wiley.com/doi/10.1111/1471-0528.12125/abstract
Correct estimation of gestational age is essential for any study of ultrasound biometry and for everyday clinical practice. However, inconsistency in pregnancy dating may occur through differences in measurement methods or errors during measurement. This paper describes the standardised crown-rump length (CRL) measurement methodology and interpretation used across study sites in the INTERGROWTH-21st Project. These methods should minimise potential systematic errors in dating associated with pooling data drom different health institutions, and represent a model for standardising CRL measurement in future studies. http://onlinelibrary.wiley.com/doi/10.1111/1471-0528.12056/abstract
Standardisation and quality control of ultrasound measurements taken in the INTERGROWTH-21st Projectby INTERGROWTH-21st
Meticulous standardisation and ongoing monitoring of adherence to measurement protocols during data collection are essential to ensure consistency and to minimise systematic error in multicentre studies. Strict ultrasound fetal biometric measurement protocols are used in the INTERGROWTH-21st Project so that data of the highest quality from different centres can be compared and potentially pooled. A central Ultrasound Quality Unit (USQU) has been set up to oversee this standardisation, training and quality control process. This paper describes the procedures used, which can form a model for research settings involving ultrasound measurements.
A unified protocol is essential to ensure that fetal ultrasound measurements taken in multicentre research studies are accurate and reproducible. This paper describes the methodology used to take two-dimensional, ultrasound measurements in the longitudinal, fetal growth component of the INTERGROWTH-21st Project. These standardised methods should minimise the systematic errors associated with pooling data from different sites. They represent a model for carrying out similar research studies in the future. http://onlinelibrary.wiley.com/doi/10.1111/1471-0528.12313/abstract
This paper outlines the objectives, design and implementation of the INTERGROWTH-21st Project, a multicentre, multiethnic, population-based project conducted in eight geographical areas (Brazil, China, India, Italy, Kenya, Oman, UK and USA), with technical support from four global specialised units, to study growth, health and nutrition from pregnancy to early infancy. It aims to produce prescriptive growth standards, which conceptually extend the World Health Organization (WHO) Multicentre Growth Reference Study (MGRS) to cover fetal and newborn life. http://onlinelibrary.wiley.com/doi/10.1111/1471-0528.12047/abstract
Conceptual basis for prescriptive growth standards from conception to early childhood: present and futureby INTERGROWTH-21st
Healthy growth in utero and after birth is fundamental for lifelong health and wellbeing. Current fetal growth charts in use are not true standards, since they are based on cross-sectional measurements of attained size under conditions that do not accurately reflect normal growth. The development of prescriptive intrauterine and newborn growth standards derived from the INTERGROWTH-21st Project provides the data that will allow us for the first time to establish what 'normal' fetal growth is. http://onlinelibrary.wiley.com/doi/10.1111/1471-0528.12057/abstract
Zulfiqar Bhutta, Chair of the INTERGROWTH-21st Steering Committee, introduces the rationale for the INTERGROWTH-21st Project. http://onlinelibrary.wiley.com/doi/10.1111/1471-0528.12032/abstract
Professor Sir Sabaratnam Arulkumaran, President of FIGO, introduces the methods of the INTERGROWTH-21st Project. http://onlinelibrary.wiley.com/doi/10.1111/1471-0528.12314/abstract