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Occupation and Asthma in an Urban Low Income Population

This study has been completed.
Sponsor:
Collaborator:
National Heart, Lung, and Blood Institute (NHLBI)
Information provided by (Responsible Party):
New York University School of Medicine
ClinicalTrials.gov Identifier:
NCT00014820
First received: April 11, 2001
Last updated: December 17, 2015
Last verified: December 2015
  Purpose
To study work-related asthma in a low-income, urban population.

Condition
Asthma
Lung Diseases

Study Type: Observational
Study Design: Observational Model: Case Control
Time Perspective: Retrospective
Official Title: Occupation and Asthma in an Urban Low Income Population

Further study details as provided by New York University School of Medicine:

Enrollment: 800
Study Start Date: March 2001
Study Completion Date: February 2005
Primary Completion Date: February 2005 (Final data collection date for primary outcome measure)
Groups/Cohorts
Patients with a diagnosis of asthma (new) (Cases)
Patients with a physician diagnosis of asthma during the 7.5 years being studied who were working at the time of diagnosis, as determined by patient interviews.
Patients with a diagnosis other than asthma (Controls)
Patients (age-matched to a case patient) with a physician diagnosis other than asthma who were working at the time of diagnosis.
Patients with a diagnosis of asthma (previous)
Patients with a physician diagnosis of asthma prior to the 7.5 years being studied

Detailed Description:

BACKGROUND:

Work-related asthma is asthma that is attributable to, or is made worse by, environmental exposures in the workplace. Published estimates of the proportion of adult asthma attributable to occupational factors have varied widely, depending on population, methodology, and definitions, from 2 percent to 33 percent. Occupational asthma is of great public health importance because it is potentially preventable, can cause substantial disability, and in some cases is completely curable. Among adults in the United States, asthma has become a major public health problem, with rates most elevated among low income, urban, African American and Latino sectors of the population, and with substantial evidence suggesting potential occupational contributions to the excess rates. These important sectors of the U.S. population have, however, been inadequately represented in the occupational asthma research literature.

DESIGN NARRATIVE:

This was a case control study of physician-diagnosed asthma, occupation, industry, and workplace environmental exposures designed to evaluate the hypothesis that a substantial component of the asthma burden in a low income, urban, largely minority population was due to occupational factors. The study design addressed a variety of methodologic challenges including healthy worker effects, difficulty contacting and recruiting this potentially high risk population, large numbers of potential etiologic agents, mixed exposures, small workplaces, and low absolute incidence of occupational asthma.

The study population was the catchment population of Bellevue Hospital, a general hospital in lower Manhattan, New York City, with busy ambulatory care services that serve low income working communities. Cases and controls were recruited from among outpatients and inpatients at Bellevue Hospital and interviewed face-to-face or by telephone. Occupation, industry, and occupational exposures were determined by questionnaire supplemented by a Job Exposure Matrix. Odds ratios (ORs) of association between asthma and specific industrial, occupational, and exposure categories, controlled for major confounders, were estimated. The ORs were used to calculate occupation- and industry-specific Attributable Fractions, and an overall Population Attributable Fraction of asthma attributable to occupational factors. New onset occupational asthma and work-aggravated asthma were investigated separately.

  Eligibility

Ages Eligible for Study:   18 Years to 65 Years   (Adult)
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population
Patients at Bellevue Hospital who were given a diagnosis between the dates of 1/1/1996 and 6/30/2003.
Criteria

Exclusion criteria:

  1. Subject unwilling to be interviewed or does not give informed consent
  2. For nonsmokers, age under 18 or over 65. For smokers, age under 18 or over 45
  3. For cases, asthma diagnosis (at Bellevue or elsewhere) prior to beginning of study period. For controls, asthma diagnosis ever.
  4. Unemployed at case onset age
  5. Fee-coded as Medicaid for all visits during study period
  6. Fluency in either English or Spanish inadequate to communicate clearly with interviewer, or need for interpreter in language other than Spanish noted in chart
  7. Medical records not HIV disease, STD, addiction-related diagnosis, or other "sensitive" diagnosis (to avoid problems of confidentiality)
  8. Clear understanding of what is being asked is lacking, in judgement of interviewer
  9. Responses to initial interview questions appear grossly unreliable, in the judgement of the interviewer
  10. Prisoners
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT00014820

Sponsors and Collaborators
New York University School of Medicine
National Heart, Lung, and Blood Institute (NHLBI)
Investigators
Principal Investigator: George Friedman-Jimenez New York University School of Medicine
  More Information

Responsible Party: New York University School of Medicine
ClinicalTrials.gov Identifier: NCT00014820     History of Changes
Other Study ID Numbers: 7953  R01HL062621 
Study First Received: April 11, 2001
Last Updated: December 17, 2015
Health Authority: United States: Federal Government
United States: Institutional Review Board

Additional relevant MeSH terms:
Asthma
Lung Diseases
Bronchial Diseases
Respiratory Tract Diseases
Lung Diseases, Obstructive
Respiratory Hypersensitivity
Hypersensitivity, Immediate
Hypersensitivity
Immune System Diseases

ClinicalTrials.gov processed this record on September 30, 2016