Optimizing Ventilation to Improve Health

Pollution; Exposure Clinical Trial

Official title:

Optimizing Windows to Improve Ventilation in Dhaka Slums

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT03894995
• Other study ID #: 46212
• Status: Completed
• Phase: N/A
• Start date: June 19, 2018
• Est. completion date: June 30, 2022

Study information

• Verified date: October 2022
• Source: Stanford University
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial 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

Recruitment information / eligibility

• Status: Completed
• Enrollment: 240
• Est. completion date: June 30, 2022
• Est. primary completion date: November 1, 2021
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 18 Years and older

Eligibility

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

Exclusion Criteria:

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

Related Conditions & MeSH terms

• Pollution; Exposure

Intervention

Other:
• Installation of ventilation
The intervention is installation of a ventilating structure, in this case a window in the house roof.

Locations

Country	Name	City	State
Bangladesh	International Centre for Diarrhoeal Disease Research, Bangladesh	Dhaka

Sponsors (4)

Lead Sponsor	Collaborator
Stanford University	International Centre for Diarrhoeal Disease Research, Bangladesh, Johns Hopkins University, University at Buffalo

Country where clinical trial is conducted

Bangladesh, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Household air exchange rate - spring (Part 3)	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.	50 minutes
Primary	Household air exchange rate - summer (Part 3)	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.	50 minutes
Primary	Household air exchange rate - fall (Part 3)	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.	50 minutes
Primary	Household air exchange rate - winter (Part 3)	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.	50 minutes
Primary	Number of households that adopt the intervention (Part 3)	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.	20 minutes
Primary	Revealed willingness-to-pay for ventilation (Part 3)	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.	20 minutes
Primary	Concentration of radon gas in house (Part 3)	We will assess the concentration gas in a subset of study households.	7 days
Primary	Concentration of indoor particulate matter 2.5 (Part 3)	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.	48 hours for normal tests; 72 hours for quality control tests.
Primary	Concentration of indoor particulate matter 2.5 (Part 2)	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.	up to 5 hours
Primary	Concentration of outdoor particulate matter 2.5 (Part 2)	We will determine the outdoor PM2.5 levels near the study households.	up to 5 hours
Primary	Personal exposure to particulate matter 2.5 - mother (Part 2)	We will determine the PM2.5 levels near the mother using a monitor worn on her body.	up to 5 hours
Primary	Personal exposure to particulate matter 2.5 - child (Part 2)	We will determine the PM2.5 levels near the child using a monitor worn on her body.	up to 5 hours
Primary	Number of non-study, neighboring households that adopt the intervention and their willingness to pay (Part 4)	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.	15 minutes