This study is a randomized controlled trial of liquefied petroleum gas (LPG) stove and fuel distribution in 3,200 households in four countries (India, Guatemala, Peru, and Rwanda). Following a common protocol, each intervention site will recruit 800 pregnant women (aged 18-34 years, 9 - \<20 weeks gestation) and will randomly assign half their households to receive LPG stoves and an 18-month supply of LPG. Control households are anticipated to continue to cook primarily with solid biomass fuels and will receive compensation based on a uniform set of trial-wide principles, customized to each site based on formative research. The mother will be followed along with her child until the child is 1 year old. The researchers estimate that 15% of households will have a second, non-pregnant older adult woman (aged 40 to \<80 years) who will also be enrolled at baseline and followed during the 18-month follow-up period. To optimize intervention use, the researchers will implement behavior change strategies informed by previous experiences and formative research in Year 1. This study will assess cookstove use, conduct repeated personal exposure assessments of household air pollution, and collect dried blood spots and urinary samples for biomarker analysis and biospecimen storage. The primary outcomes are low birth weight, severe pneumonia incidence, and stunting of the child, and systolic blood pressure in the older adult woman. Participants in India, Guatemala and Rwanda will be followed until the child is 5 years old to assess the longer-term effects of the intervention.
Globally, nearly 3 billion people rely on solid fuels for cooking and heating, the vast majority in low- and middle-income countries (LMICs). The resulting household air pollution (HAP) is the third leading risk factor in the 2010 global burden of disease, accounting for an estimated 4.3 million deaths annually, largely among women and young children. Previous interventions have provided cleaner biomass-based cookstoves but have failed to reduce exposure to levels that produce meaningful health improvements. There have been no large-scale field trials with liquefied petroleum gas (LPG) cookstoves, likely the cleanest scalable intervention. The aim of this study is to conduct a randomized controlled trial of LPG stove and fuel distribution in 3,200 households in four LMICs (India, Guatemala, Peru, and Rwanda) to deliver rigorous evidence regarding potential health benefits across the lifespan. Each intervention site will recruit 800 pregnant women (aged 18-34 years, 9 - \<20 weeks gestation) and will randomly assign half their households to receive LPG stoves and an 18-month supply of LPG. Control households are anticipated to continue to cook primarily with solid biomass fuels and will receive compensation based on a uniform set of trial-wide principles, customized to each site based on formative research. The mother will be followed along with her child until the child is 1 year old. In households with a second, non-pregnant older adult woman (aged 40 to \<80 years) the researchers will also enroll and follow her during the 18-month follow-up period in order to assess cardiopulmonary, metabolic, and cancer outcomes. To optimize intervention use, the researchers will implement behavior change strategies. This study will assess cookstove use, conduct repeated personal exposure assessments to HAP (PM2.5, black carbon, carbon monoxide), and collect dried blood spots and urinary samples for biomarker analysis and biospecimen storage on all participants at multiple time points. The primary outcomes are low birth weight, severe pneumonia incidence, and stunting of the child, and systolic blood pressure in the older adult woman. This study will address the following specific aims: (1) using an intent-to-treat analysis, determine the effect of a randomized LPG stove and fuel intervention on health in four diverse LMIC populations using a common protocol; (2) determine the exposure-response relationships for HAP and health outcomes; and (3) determine relationships between LPG intervention and both targeted and exploratory biomarkers of exposure/health effects. This study will provide evidence, including costs and implementation strategies, to inform national and global policies on scaling up LPG stoves among vulnerable populations. Ultimately, this will facilitate deeper policy-level discussions as well as identify requirements for initiating and sustaining HAP interventions globally. The intervention delivery occurred until the child was one year of age. The researchers will continue to follow participants in India, Guatemala and Rwanda until the child is 5 years old to assess the longer-term effects of the intervention. Previous evidence suggests that the benefits of reduced exposure during the first, critical year of development will continue even if the intervention ends. The researchers will continue using methods employed during the HAPIN trial period. The HAPIN trial provides a unique context in which to address these questions, particularly given the successful intervention and exposure reduction. Participants are well-characterized and health and exposures to air pollution are being documented. Critically, because of its experimental design of the trial, continued follow-up of the cohort will provide rigorous causal inferences about the effects of this 500-day intervention over the most important period of early childhood development.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
PREVENTION
Masking
NONE
Enrollment
3,640
The intervention consists of a high-quality locally available liquefied petroleum gas (LPG) stove having at least two burners, a continuous supply of LPG fuel for 18 months, and the promotion of stove use on an exclusive basis for cooking. The intervention will be provided free of charge to all intervention households upon enrollment. On a weekly basis, study staff will examine stove condition, perform any necessary repairs, and measure and record weight of LPG tanks in order to anticipate need for refills.
Universidad del Valle de Guatemala
Guatemala City, Departamento de Guatemala, Guatemala
Sri Ramachandra Institute of Higher Education and Research
Chennai, Tamil Nadu, India
Puno Global Non-Communicable Disease Research Site, School of Medicine, Johns Hopkins University
Puno, Peru
Rwanda Research Site, London School of Hygiene and Tropical Medicine, University of Liverpool
Kigali, Rwanda
Birth weight
Birth weight is assessed by a trained nurse or health worker within 24 hours of birth. Infants are weighed naked or in a pre-weighed blanket. Weight is measured to the nearest 10 g using a digital electronic scale, if performed by the study field staff; otherwise, hospital medical records are used.
Time frame: Within 24 hours of birth (up to 5 months post-randomization of mother)
Incidence of HAPIN Defined Severe Pneumonia
The number of times a child has severe pneumonia over their period of follow-up during the first year of life is assessed. For this study pneumonia criteria are adapted from the WHO classification of childhood pneumonia (2014) and there are 3 algorithms for case criteria: 1) the presence of cough and/or difficult breathing and at least 1 general danger sign plus evidence of pneumonia on lung imaging (i.e., lung ultrasound or chest x-ray), or 2) the presence of cough and/or difficult breathing and hypoxemia (measured either via pulse oximetry (SpO2), or observing a child requiring advanced respiratory support (i.e., intubation and mechanical ventilation, non-invasive ventilation with continuous or bi-level positive airway pressure support, or high-flow nasal cannula oxygen), or 3) children who die prior to evaluation but their death is attributed to pneumonia by verbal autopsy. Cases of pneumonia are recorded children present to HAPIN health facilities with respiratory symptoms.
Time frame: Up to 12 months after birth
Length-for-age z-score 2 standard deviations below the standard
The primary outcome measured is stunting at one year of age, defined as a length-for-age z-score (LAZ) that is 2 standard deviations below the median of the growth standard. Infant length is assessed at birth and quarterly thereafter, until the child is 12 months old. Z-scores are calculated using the 2006 World Health Organization (WHO) Multi-Growth Reference Standard (MGRS).
Time frame: 12 months after birth
Systolic Blood Pressure Among Older Adult Women
Systolic blood pressure is assessed in the older adult women in the intervention and control arms using automatic sphygmomanometers (Omron HEM-907XL; Osaka, Japan). The study team uses the procedures adapted from previously validated methods and cardiovascular outcome studies, following recommendations for the American Heart Association and the European Society of Hypertension.
Time frame: Baseline, 3, 6, 9, 12, and 18 months post-randomization
Child Linear Growth During Extended Follow-up
Linear growth of children is assessed in centimeters of height.
Time frame: 24, 36, 48 and 60 months of age
Caregiver Reported Early Childhood Development Instrument (CREDI) Score During Extended Follow-up
Child development is assessed with the Caregiver Reported Early Childhood Development Instrument (CREDI). The CREDI is a population-level measure of early childhood development (ECD) for children from 0-3 years of age. The CREDI assesses 4 domains of child development: 1) motor (fine and gross motor), 2) language (expressive and receptive language), 3) cognitive (executive function, problem solving and reasoning, and pre-academic knowledge), and 4) social-emotional (emotional and behavioral self-regulation, emotional knowledge, and social competence). The CREDI long form consists of up to 108 items and the number of questions answered depends on the age of the child. Responses of "yes" are coded as 1 and "no" is coded as 0; certain items are reverse coded. Both domain-specific and overall z-scores are calculated. Total raw scores increase by age (with developmental progression), and higher scores indicate increased development.
Time frame: 24 months of age
Malawi Developmental Assessment Tool (MDAT) Score
The MDAT measures gross motor (39 items), fine motor (42 items), language/cognition (40 items) and social skills (36 items). Originally developed and validated in rural Malawi, it has now been used in over 25 countries with more than 8,000 children as both a clinical and research tool. The MDAT is a continuous test with start and stop rules. Most items are administered directly to the child and items that are not easily observed (e.g., child speaks in full sentences; child understands sharing with others; child can dress self) are administered by parent report. Children receive either a pass or fail for each item, and summed pass scores can produce a composite score as well as domain-specific scores. Total scores range from 0 to 157 where higher scores indicate greater neurodevelopment.
Time frame: 36, 48 and 60 months of age
Gestational Systolic Blood Pressure
Blood pressure is assessed in the pregnant women in the intervention and control arms using automatic sphygmomanometers (OMRON HEM-907XL; Osaka, Japan). The study team will use the procedures adapted from previously validated methods and cardiovascular outcome studies, following recommendations for the American Heart Association and the European Society of Hypertension.
Time frame: Baseline (9-20 weeks gestation), 24-28 and 32-36 weeks gestation
Gestational Diastolic Blood Pressure
Blood pressure is assessed in the pregnant women in the intervention and control arms using automatic sphygmomanometers (OMRON HEM-907XL; Osaka, Japan). The study team will use the procedures adapted from previously validated methods and cardiovascular outcome studies, following recommendations for the American Heart Association and the European Society of Hypertension.
Time frame: Baseline (9-20 weeks gestation), 24-28 and 32-36 weeks gestation
Systolic Blood Pressure in New Mothers
Blood pressure is assessed in the new mothers in the intervention and control arms using automatic sphygmomanometers (OMRON HEM-907XL; Osaka, Japan). The study team will use the procedures adapted from previously validated methods and cardiovascular outcome studies, following recommendations for the American Heart Association and the European Society of Hypertension.
Time frame: 9, 12, and 18 months post-randomization
Diastolic Blood Pressure in New Mothers
Blood pressure is assessed in the new mothers in the intervention and control arms using automatic sphygmomanometers (OMRON HEM-907XL; Osaka, Japan). The study team will use the procedures adapted from previously validated methods and cardiovascular outcome studies, following recommendations for the American Heart Association and the European Society of Hypertension.
Time frame: 9, 12, and 18 months post-randomization
Diastolic Blood Pressure Among Older Adult Women
Diastolic blood pressure is assessed in the older adult women in the intervention and control arms using automatic sphygmomanometers (Omron HEM-907XL; Osaka, Japan). The study team uses the procedures adapted from previously validated methods and cardiovascular outcome studies, following recommendations for the American Heart Association and the European Society of Hypertension.
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Time frame: Baseline, 3, 6, 12 and 18 months post-randomization
Mean arterial pressure
Mean arterial pressure is assessed in the older adult women in the intervention and control arms using automatic sphygmomanometers (Omron HEM-907XL; Osaka, Japan). Mean arterial pressure is calculated as DBP+(SBP-DBP)/3, where SBP=systolic blood pressure and DBP=diastolic blood pressure.
Time frame: Baseline, 3, 6, 12 and 18 months post-randomization
Pulse pressure
Pulse pressure is assessed in the older adult women in the intervention and control arms using automatic sphygmomanometers (Omron HEM-907XL; Osaka, Japan). pressure. Pulse pressure is the difference between systolic blood pressure and diastolic blood pressure.
Time frame: Baseline, 3, 6, 12 and 18 months post-randomization
Fetal Growth
Pregnant women have ultrasounds at Baseline and during gestation weeks 24-28 and gestation weeks 32-36 to measure fetal growth outcomes. Specifically, the researchers evaluate head circumference (HC), abdominal circumference (AC), femur length (FL) and estimated fetal weight (EFW) during gestation. The researchers are comparing (i) z-scores of individual fetal growth measurements (HC, AC, FL, EFW) at the 2 growth ultrasound visits between intervention and control participants (separately at 24-28 weeks gestation and 32-36 weeks gestation); (ii) differences in proportions of the 2.5th percentiles of each of these measurements evaluated separately at 24-28 and 32-36 weeks gestation; (iii) Z-score trajectories of HC, AC, FL and EFW as a function of gestational age and intervention; and (iv) prevalence of small for gestational age (SGA) during the fetal period through birth as measured by WHO INTERGROWTH 21st standards.
Time frame: Baseline, Gestation Week 24-28 and Gestation Week 32-36
Gestational age at birth
Gestational age at birth is measured in weeks, as continuous outcome, among all live births.
Time frame: Up to 5 months (within 24 hours of birth, 3-5 months post randomization)
Preterm birth
Preterm birth is defined as delivery of a living infant prior to 37 completed weeks of gestation.
Time frame: Up to 5 months (within 24 hours of birth, 3-5 months post randomization)
WHO Non-severe Pneumonia
Cumulative incidence of WHO non-severe pneumonia (2014 definition and 2013 definition) during the first year of life. Cases of pneumonia are recorded whenever children present to HAPIN health facilities with respiratory symptoms.
Time frame: Up to 12 months after birth
WHO Severe Pneumonia
Cumulative incidence of WHO non-severe pneumonia (2014 definition and 2013 definition) during the first year of life. Cases of pneumonia are recorded whenever children present to HAPIN health facilities with respiratory symptoms.
Time frame: Up to 12 months after birth
Hospitalization for respiratory illness
Cumulative incidence of hospitalizations for a respiratory illness during the first year of life.
Time frame: Up to 12 months after birth
WHO Pocket Book Non-severe Pneumonia
Cumulative incidence of WHO non-severe pneumonia during the first year of life, as defined in the second edition of the "Pocket book of hospital care for children" (2013). Cases of pneumonia are recorded whenever children present to HAPIN health facilities with respiratory symptoms.
Time frame: Up to 12 months after birth
WHO Pocket Book Severe Pneumonia
Cumulative incidence of WHO severe pneumonia during the first year of life, as defined in the second edition of the "Pocket book of hospital care for children" (2013). Cases of pneumonia are recorded whenever children present to HAPIN health facilities with respiratory symptoms.
Time frame: Up to 12 months after birth
Hypoxemic Pneumonia
Cumulative incidence of hypoxemic pneumonia during the first year of life. Cases of pneumonia are recorded whenever children present to HAPIN health facilities with respiratory symptoms.
Time frame: Up to 12 months after birth
Ultrasound or Radiograph Pneumonia
Cumulative incidence of lung ultrasound or chest radiograph pneumonia during the first year of life. Cases of pneumonia are recorded whenever children present to HAPIN health facilities with respiratory symptoms.
Time frame: Up to 12 months after birth
Brachial artery reactivity testing (BART)
Brachial artery reactivity testing (BART) measures endothelial function via flow-mediated dilatation to reactive hyperemia following the release of arm blood-flow occlusion. In this test, baseline artery diameter is measured, then a blood pressure cuff is inflated to induce distal arm ischemia for 5 minutes and after releasing the pressure, the post-occlusion brachial artery diameter is measured. The ratio of post- to pre-occlusion artery diameter represents endothelial function where lower values indicate worse endothelial function. (Peru only)
Time frame: Baseline, 18 months post-randomization
Carotid intima-media thickness (CIMT) Among Older Adult Women
The carotid intima-media thickness test (CIMT) is used to determine the extent of carotid atherosclerotic vascular disease. The test measures the thickness of the inner two layers of the carotid artery and can detect plaque build up prior to physical symptoms being experienced. The carotid ultrasound will be performed with a portable ultrasound by trained sonographers.
Time frame: Baseline, 18 months post-randomization
St. George Respiratory Questionnaire (SGRQ) Score
Adult respiratory health and well-being is assessed with the St. George Respiratory Questionnaire (SGRQ). The SGRQ measures impaired health and perceived well-being among individuals with chronic airway disease. The SGRQ has sections assessing symptoms, activities that cause breathlessness or are limited because of breathlessness, and the impacts of respiratory problems on employment, sense of control of health, panic, stigmatization, medication use, side effects of therapies, expectations for health and disturbances of daily life. The questionnaire includes multiple choice, true/false and open-ended questions.
Time frame: Baseline, 18 months post-randomization
Short Form 36 Survey (SF-36) Score Among Older Adult Women
The Short Form 36 survey (SF-36) is a standardized, preference-based 36 item questionnaire evaluating quality of life. The survey has 8 sections (vitality, physical functioning, bodily pain, general health perceptions, physical role functioning, emotional role functioning, social role functioning, and mental health). Possible scores range from 0 (lowest quality of life) to 100 (highest quality of life).
Time frame: Baseline, 18 months post-randomization
Weight
Weight is measured in kilograms (kg). Weight in new mothers in Rwanda is measured when the child is 24 months old. For new mothers in Guatemala weight is measured when the child is 24 and 36 months old. In older adult women, weight is measured when the child is 24 months old. Weight is measured in children at 24, 36, 48 and 60 months of age.
Time frame: 24, 36, 48 and 60 months of age of the child
Body Mass Index (BMI)
BMI is calculated as weight in kilograms divided by height in meters (m) squared (kg/m\^2). BMI in new mothers in Rwanda is calculated from height and weight measurements obtained when the child is 24 months old. For new mothers in Guatemala BMI is calculated from height and weight measurements obtained when the child is 24 and 36 months old. In older adult women, BMI is calculated from height and weight measurements obtained when the child is 24 months old.
Time frame: 24, 36, 48 and 60 months of age of the child
Height
Height is measured in meters. Height in new mothers in Rwanda is measured when the child is 24 months old. For new mothers in Guatemala height is measured when the child is 24 and 36 months old. In older adult women, height is measured when the child is 24-months old.
Time frame: 24 and 36 months of age of the child
Child Blood Pressure
Blood pressure is assessed in the children using automatic sphygmomanometers (OMRON HEM-907XL; Osaka, Japan). The study team uses the procedures adapted from previously validated methods and cardiovascular outcome studies, following recommendations for the American Heart Association and the European Society of Hypertension.
Time frame: 24 (Rwanda only) and 60 months of age
Child Linear Growth
Linear growth of children is assessed in centimeters at birth and quarterly thereafter, until the child is 12 months old.
Time frame: Birth (3-5 months post-randomization), and 3, 6, 9, and 12 months of age
Caregiver Reported Early Childhood Development Instrument (CREDI) Score
Child development is assessed with the Caregiver Reported Early Childhood Development Instrument (CREDI). The CREDI is a population-level measure of early childhood development (ECD) for children from 0-3 years of age. The CREDI assesses 4 domains of child development: 1) motor (fine and gross motor), 2) language (expressive and receptive language), 3) cognitive (executive function, problem solving and reasoning, and pre-academic knowledge), and 4) social-emotional (emotional and behavioral self-regulation, emotional knowledge, and social competence). The CREDI long form consists of up to 108 items and the number of questions answered depends on the age of the child. Responses of "yes" are coded as 1 and "no" is coded as 0; certain items are reverse coded. Both domain-specific and overall z-scores are calculated. Total raw scores increase by age (with developmental progression), and higher scores indicate increased development.
Time frame: 3 and 12 months of age