Optimizing Ventilation to Improve Health

Optimizing Windows to Improve Ventilation in Dhaka Slums

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

Study Overview

• Status: Completed
• Conditions: Pollution; Exposure
• Intervention / Treatment: Other: Installation of ventilation

• Study Type: Interventional
• Enrollment (Actual): 240
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Bangladesh
  • Dhaka, Bangladesh, 1212
    • International Centre for Diarrhoeal Disease Research, Bangladesh

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 14 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

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

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Prevention
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: None (Open Label)

Number of Arms

5

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
No Intervention: Part 1. Focus group discussions on ventilation preferences; Participant's perceived benefits/detriments of having ventilation options in the household and their opinions on the behavior change material developed to encourage increased household ventilation will be explored using 6-9 focus group discussions with 10-12 participants each.
No Intervention: Part 2. PM 2.5 pilot; Indoor, outdoor, and personal particulate matter concentrations among ten mother-child pairs and their homes will be monitored.
Experimental: Part 3. Intervention; 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.	Other: Installation of ventilation; The intervention is installation of a ventilating structure, in this case a window in the house roof.
No Intervention: Part 3. Control; For 12 month after intervention, the air exchange rate will be measured in all control households.
No Intervention: Part 4. Spillover; Households that neighbor enrolled study households will be surveyed and asked whether they, on their own, chose to install a window. If they did install a window, they will be asked how much they paid.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
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
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
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
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
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
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
Concentration of radon gas in house (Part 3)	We will assess the concentration gas in a subset of study households.	7 days
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.
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
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
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
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
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

Collaborators and Investigators

• Sponsor: Stanford University
• Collaborators: Johns Hopkins University; University at Buffalo; International Centre for Diarrhoeal Disease Research, Bangladesh
• Investigators: Principal Investigator: Stephen P Luby, Dr., Stanford University

Study record dates

Study Major Dates

• Study Start (Actual): June 19, 2018
• Primary Completion (Actual): November 1, 2021
• Study Completion (Actual): June 30, 2022

Study Registration Dates

• First Submitted: March 27, 2019
• First Submitted That Met QC Criteria: March 27, 2019
• First Posted (Actual): March 29, 2019

Study Record Updates

• Last Update Posted (Actual): October 12, 2022
• Last Update Submitted That Met QC Criteria: October 7, 2022
• Last Verified: October 1, 2022

More Information

Terms related to this study

• Keywords: Ventilation
• Other Study ID Numbers: 46212

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: No

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No