Applied Implementation Research for Clean Cooking in Cambodia

NCT06942715 | Recruiting

• 3 other identifiers: STUDY000079291R01ES035395-01A12025P013174
• Study Type: interventional
• Target: 6,150
• Locations: 1 country
• Sites: 1

Brief Summary

The goal of this study is to learn how to help families in Cambodia switch to using electric induction stoves instead of traditional stoves that burn wood or charcoal. The study will also look at whether this switch is safe, affordable, and sustainable over time. The main questions researchers want to answer are:

• What strategies work best to encourage families to use induction stoves regularly and stop using traditional cooking methods?
• Does switching to induction cooking reduce household air pollution for primary cooks?
• What are the costs and benefits of these strategies? To answer these questions, researchers will compare four different strategies across 62 peri-urban villages in Cambodia. They will use data loggers to track when families use induction stoves or traditional stoves, and measure air pollution levels in the home before and after families receive induction stoves. Participants will:
• Receive an electric induction stove and support based on their group's strategy
• Have their stove use tracked through special devices
• Take part in air pollution measurements in their homes
• Share information about their cooking habits and experiences

Conditions

Exposure to Environmental Pollution; Exposure to Household Air Pollution

Keywords

Cooking methods; Induction stoves

Outcome Measures

Primary Outcomes (4)

• Induction stove purchase: Proportion of eligible households that purchase an induction stove, based on study and sales records

  This outcome will assess the proportion of eligible households that purchase an induction stove during the intervention period. Purchase data will be tracked through verified sales receipts linked to household study IDs. The outcome will be calculated as the number of participating households with a confirmed induction stove purchased divided by the total number of households in the enrolled community. Results will be reported overall and stratified by household income status.

  12 months, at the end of intervention completion

• Induction stove use: Number of daily cooking events

  This outcome will assess the intensity of induction stove use derived from built-in stove usage data loggers installed on all induction stoves sold to participants. All participating households that purchase an induction stove and consent to follow-up monitoring will have induction stove usage recorded up to 30 months following stove purchase. These devices log time-of-use for each induction surface/burner and energy used by the stove during cooking. This metric will count the number of daily cooking events.

  Up to 30 months following stove purchase

• Induction stove use: Duration of daily cooking

  This outcome will assess the intensity of induction stove use derived from built-in stove usage data loggers installed on all induction stoves sold to participants. All participating households that purchase an induction stove and consent to follow-up monitoring will have induction stove usage recorded up to 30 months following stove purchase. These devices log time-of-use for each induction surface/burner and energy used by the stove during cooking. This metric will evaluate the duration of stove use per day

  Up to 30 months following stove purchase

• Induction stove use: Daily electricity consumption of cooking events

  This outcome will assess the intensity of induction stove use derived from built-in stove usage data loggers installed on all induction stoves sold to participants. All participating households that purchase an induction stove and consent to follow-up monitoring will have induction stove usage recorded up to 30 months following stove purchase. These devices log time-of-use for each induction surface/burner and energy used by the stove during cooking. This metric will evaluate the amount of energy used per day by the induction stove unit: (electricity consumption in kWh)

  Up to 30 months following stove purchase

Secondary Outcomes (3)

• Biomass stove disuse: Proportion of days with no biomass stove use among households that purchased an induction stove

  Daily, over a 1-week period following stove purchase

• Determinants: Induction stove purchase and use determinants

  30 months

• Personal exposure: Changes in personal 24-hour exposure to PM2.5 among primary cooks, measured before and after the intervention

  30 months

Other Outcomes (6)

• Reach: Number and proportion of households reached by implementation strategies

  30 months

• Adoption: Proportion of recruited implementing organizations that adopt and deliver the implementation strategies as designed

  30 months

• Implementation: Intervention quality

  30 months

Study Arms (5)

"Standard" implementation delivery

EXPERIMENTAL

The intervention will be promoted through a combination of (1) digital outreach and (2) community-centered demand generation. This includes: 1. Low-touch awareness raising through geo-targeted social media promotion. 2. In-person, village-level promotion through community engagement and local communication channels to raise awareness and build trust

Other: Electric Induction Cookstoves

"Standard Plus" implementation delivery

EXPERIMENTAL

The intervention will be promoted through a combination of (1) digital outreach and (2) community-centered demand generation, paired with (3) stove subsidies. This includes: 1. Low-touch awareness raising through geo-targeted social media promotion. 2. In-person, village-level promotion through community engagement and local communication channels to raise awareness and build trust. 3. Lower-value, untargeted stove subsidy for all households and a higher-value, targeted subsidy for low-income households to improve affordability and access.

Other: Electric Induction Cookstoves

"Enhanced" implementation delivery

EXPERIMENTAL

The intervention will be promoted through a combination of (1) digital outreach, (2) community-centered demand generation, and (3) direct sales. This includes: 1. Low-touch awareness raising through geo-targeted social media promotion. 2. In-person, village-level promotion through community engagement and local communication channels to raise awareness and build trust. 3. Door-to-door and group-based direct sales efforts to engage customers, demonstrate products, and facilitate purchases.

Other: Electric Induction Cookstoves

"Enhanced Plus" implementation delivery

EXPERIMENTAL

The intervention will be promoted through a combination of (1) digital outreach, (2) community-centered demand generation, and (3) direct sales, paired with (4) stove subsidies. This includes: 1. Low-touch awareness raising through geo-targeted social media promotion. 2. In-person, village-level promotion through community engagement and local communication channels to raise awareness and build trust. 3. Door-to-door and group-based direct sales efforts to engage customers, demonstrate products, and facilitate purchases. 4. Lower-value, untargeted stove subsidy for all households and a higher-value, targeted subsidy for low-income households to improve affordability and access

Other: Electric Induction Cookstoves

"Reference" implementation delivery

ACTIVE COMPARATOR

The intervention will be promoted through only digital outreach, using low-touch awareness raising through geo-targeted social media promotion.

Other: Electric Induction Cookstoves

Interventions

Electric Induction Cookstoves OTHER

The intervention consists of high-quality, locally available electric induction cookstoves with one or two burners, each equipped with cloud-connected data loggers, and includes compatible cookware.

"Enhanced Plus" implementation delivery; "Enhanced" implementation delivery; "Reference" implementation delivery; "Standard Plus" implementation delivery; "Standard" implementation delivery

Eligibility Criteria

• Age: 18 Years+
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• \- A household must:
• Provide consent to participate in our study, with at least one adult household member who identifies as the primary cook consenting to serve as the study participant
• Resides in village selected for implementation
• Household has electricity access
• Household does not already use electricity-based induction cooking technology

You may not qualify if:

• Household members currently smoke cigarettes or other tobacco products
• Plans to move permanently outside the study area in the next 12 months
• The primary cook prepares food and/or drink for commercial sale

Sponsors & Collaborators

• National Institute of Environmental Health Sciences (NIEHS): collaborator
• Emory University: lead

Study Sites (1)

International Development Enterprises: iDE

Kampong Speu, Kampong Speu Province, Cambodia

RECRUITING

Study Officials

• Matthew Freeman, PhD

  Rollins School of Public Health

  PRINCIPAL INVESTIGATOR

Central Study Contacts

Matthew Freeman, PhD

CONTACT

404-712-8767; matthew.freeman@emory.edu

Jedidiah Snyder, PhD

CONTACT

jedidiah.snyder@emory.edu

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: NONE
• Purpose: HEALTH SERVICES RESEARCH
• Intervention Model: PARALLEL
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Professor

Model Details: Hybrid type II cluster randomized trial

Study Record Dates

• First Submitted: March 24, 2025
• First Posted: April 24, 2025
• Study Start: October 13, 2025
• Primary Completion (Estimated): December 1, 2028
• Study Completion (Estimated): December 1, 2028
• Last Updated: January 7, 2026

Record last verified: 2026-01

Data Sharing

• IPD Sharing: Will share
• Shared Documents: STUDY PROTOCOL, SAP, ICF, CSR
• Time Frame: Data will be shared either at the time of publication or at the end of the performance period of the extramural award that produced it, whichever comes first.
• Access Criteria: A review committee will evaluate applications. Successful applicants will be required to sign data use agreements outlining the terms and conditions of data access. Data will be made available through a publicly accessible repository, where approved users can access the data, metadata, and any associated documentation

Locations

CA (1)