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Volume 26, Number 9—September 2020

Costs Associated with Nontuberculous Mycobacteria Infection, Ontario, Canada, 2001–2012

Lauren C. RamsayComments to Author , Emily Shing, John Wang, Theodore K. Marras, Jeffrey C. Kwong, Sarah K. Brode, Frances B. Jamieson, and Beate Sander
Author affiliations: University Health Network, Toronto, Ontario, Canada (L.C. Ramsay, T.K. Marras, J.C. Kwong, S.K. Brode, B. Sander); University of Toronto, Toronto (L.C. Ramsay, T.K. Marras, J.C. Kwong, S.K. Brode, F.B. Jamieson, B. Sander); Public Health Ontario, Toronto (E. Shing, J. Wang, J.C. Kwong, F.B. Jamieson, B. Sander); ICES, Toronto (J. Wang, J.C. Kwong, S.K. Brode, B. Sander); West Park Healthcare Centre, Toronto (S.K. Brode)

Main Article

Table 1

Variables used for matching persons exposed to nontuberculous mycobacteria to unexposed persons in study of costs associated with nontuberculous mycobacteria infection, Ontario, Canada, 2001–2012*

Variable Index date Death date
Baseline covariates–hard-matching
Index date ± 30 d NA
Death date NA ± 90 d
Age ± 1 y ± 5 y
Propensity score variable
Rurality Index of Ontario† At index date 180 d before death
Neighborhood income quintile At index date 180 d before death
Collapsed aggregated diagnosis groups‡ 2 y before index date

*Persons were hard-matched with regard to age, sex, and index date as well as within 0.2 SDs of the logit of the propensity score. To examine the effect of nontuberculous mycobacteria on costs before death, exposed persons who died during the observation period were rematched with 3 unexposed persons from the general population who also died during the same period, by use of covariates assessed 180 days before. NA, not applicable.
†The Rurality Index of Ontario is a weighted function of community population/density, travel time to nearest basic referral center, and travel time to nearest advanced referral center (
‡The Johns Hopkins ACG system ( groups comorbid diagnoses into clinical groups considering illness recurrence, severity, and resource use intensity.

Main Article

Page created: July 10, 2020
Page updated: August 18, 2020
Page reviewed: August 18, 2020
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