Optimizing Ventilation to Improve Health

Not Applicable

Completed

• Conditions: Pollution; Exposure
• Interventions: Other: Installation of ventilation

• Registration Number: NCT03894995
• Lead Sponsor: Stanford University

Brief Summary

Our overall goal is to optimize preferred, ventilating windows/apertures/vents in low-income neighborhoods of Dhaka, Bangladesh. We will:

I. Collect baseline data on housing types and finalize windows/vents protoypes.

II. Measure the impact of improved ventilation on air exchange rates in houses in low-income neighborhoods of Dhaka and characterize the current and potential market for windows/vents in households in low-income neighborhoods of Dhaka, Bangladesh.

III. Understand recipients' (tenants and landords) perceived benefits of installed window/vent designs and difficulties faced with adoption of each design

Detailed Description

Not available

Study Timeline

• Study Start: 2018-06-19
• Study First Submitted: 2019-03-27
• Study First Submitted QC: 2019-03-27
• Study First Posted: 2019-03-29
• Primary Completion: 2021-11-01
• Study Completion: 2022-06-30
• Status Verified: 2022-10
• Last Update Submitted: 2022-10-07
• Last Update Posted: 2022-10-12

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 240

Inclusion Criteria

• 1. lack cross-ventilation at the time of enrollment
• 2. have obtained landlord permission to make adjustments to their dwelling,
• 3. have a free roof where a window can be installed

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Exclusion Criteria

• 1. Household reports receiving dust from nearby machine that pulverizes materials for making roads

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Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Part 3. Intervention	Installation of ventilation	Households will participate in a baseline survey and a Beck-DeGroot-Marshak auction to establish willingness-to-pay for ventilation. If the household wins, or if it is decided to install ventilation in all intervention households, the household will receive installation of a ventilating mechanism.

Primary Outcome Measures

Name	Time	Method
Household air exchange rate - spring (Part 3)	50 minutes	Repeated household measurements of effective point ventilation to approximate air exchange rates in both treatment and control households will be obtained. Air exchange rates will be reported as air changes per hour for the home as well as liters of air per cubic meter per second per person.
Number of households that adopt the intervention (Part 3)	20 minutes	Takeup of the intervention will be defined by whether a household had a ventilation design installed, either by winning the BDM auction paying the full price or by accepting a free installation after previously losing the BDM auction.
Concentration of outdoor particulate matter 2.5 (Part 2)	up to 5 hours	We will determine the outdoor PM2.5 levels near the study households.
Household air exchange rate - fall (Part 3)	50 minutes	Repeated household measurements of effective point ventilation to approximate air exchange rates in both treatment and control households will be obtained. Air exchange rates will be reported as air changes per hour for the home as well as liters of air per cubic meter per second per person.
Concentration of indoor particulate matter 2.5 (Part 2)	up to 5 hours	We will determine the indoor PM2.5 levels in study households, as well as the number of hours with indoor PM2.5 exceeding 50 and 100 µg/m3 during the observation period.
Personal exposure to particulate matter 2.5 - child (Part 2)	up to 5 hours	We will determine the PM2.5 levels near the child using a monitor worn on her body.
Household air exchange rate - winter (Part 3)	50 minutes	Repeated household measurements of effective point ventilation to approximate air exchange rates in both treatment and control households will be obtained. Air exchange rates will be reported as air changes per hour for the home as well as liters of air per cubic meter per second per person.
Household air exchange rate - summer (Part 3)	50 minutes	Repeated household measurements of effective point ventilation to approximate air exchange rates in both treatment and control households will be obtained. Air exchange rates will be reported as air changes per hour for the home as well as liters of air per cubic meter per second per person.
Concentration of radon gas in house (Part 3)	7 days	We will assess the concentration gas in a subset of study households.
Concentration of indoor particulate matter 2.5 (Part 3)	48 hours for normal tests; 72 hours for quality control tests.	We will determine the indoor PM2.5 levels in study households, as well as the number of hours with indoor PM2.5 exceeding 50 and 100 µg/m3 during the observation period. A subset of households will have longer tests for quality control.
Revealed willingness-to-pay for ventilation (Part 3)	20 minutes	We will obtain stated willingness-to-pay for the ventilation designs through the BDM auction mechanism, which will be used to trace out a demand curve for ventilation, plotting the number of households that are willing to pay for a window agaist their stated price.
Number of non-study, neighboring households that adopt the intervention and their willingness to pay (Part 4)	15 minutes	We will survey households that neighbor enrolled study households to ask if they have installed a window on their own since the enrollment for the randomized control trial. If they did install a window, we will ask how much they paid.
Personal exposure to particulate matter 2.5 - mother (Part 2)	up to 5 hours	We will determine the PM2.5 levels near the mother using a monitor worn on her body.

Trial Locations

Locations (1)

International Centre for Diarrhoeal Disease Research, Bangladesh; 🇧🇩 Dhaka, Bangladesh