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Completed

NCT Number: NCT03894995

Optimizing Ventilation to Improve Health

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

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Key information

Conditions

Pollution; Exposure Pathologic Processes Pathological Conditions, Signs and Symptoms Respiration Disorders Respiratory Aspiration Respiratory Tract Diseases

Age range

18 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

International Centre for Diarrhoeal Disease Research, Bangladesh

Dhaka, 1212, Bangladesh

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

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

Treatment and study plan

Installation of ventilation

Other

The intervention is installation of a ventilating structure, in this case a window in the house roof.

Primary outcomes

  1. Household air exchange rate - spring (Part 3)

    Time frame: 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.

  2. Household air exchange rate - summer (Part 3)

    Time frame: 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.

  3. Household air exchange rate - fall (Part 3)

    Time frame: 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.

  4. Household air exchange rate - winter (Part 3)

    Time frame: 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.

  5. Number of households that adopt the intervention (Part 3)

    Time frame: 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.

  6. Revealed willingness-to-pay for ventilation (Part 3)

    Time frame: 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.

  7. Concentration of radon gas in house (Part 3)

    Time frame: 7 days

    We will assess the concentration gas in a subset of study households.

  8. Concentration of indoor particulate matter 2.5 (Part 3)

    Time frame: 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.

  9. Concentration of indoor particulate matter 2.5 (Part 2)

    Time frame: 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.

  10. Concentration of outdoor particulate matter 2.5 (Part 2)

    Time frame: up to 5 hours

    We will determine the outdoor PM2.5 levels near the study households.

  11. Personal exposure to particulate matter 2.5 - mother (Part 2)

    Time frame: up to 5 hours

    We will determine the PM2.5 levels near the mother using a monitor worn on her body.

  12. Personal exposure to particulate matter 2.5 - child (Part 2)

    Time frame: up to 5 hours

    We will determine the PM2.5 levels near the child using a monitor worn on her body.

  13. Number of non-study, neighboring households that adopt the intervention and their willingness to pay (Part 4)

    Time frame: 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.

Sponsors and collaborators

Lead sponsor

Stanford University

Other

Collaborators

  • International Centre for Diarrhoeal Disease Research, Bangladesh
  • Johns Hopkins University
  • University at Buffalo

Registry information

Official study title

Optimizing Windows to Improve Ventilation in Dhaka Slums

Important dates

Study start
2018
Primary completion
2021
Study completion
2022
First posted
Mar 29, 2019
Registry last updated
Oct 12, 2022

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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