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. 2023 Aug 10:42:100871.
doi: 10.1016/j.lanwpc.2023.100871. eCollection 2024 Jan.

Prevalence, incidence, and survival analysis of interstitial lung diseases in Hong Kong: a 16-year population-based cohort study

Yisha Ye  1 , Chor-Wing Sing  1   2 , Richard Hubbard  3 , David Chi Leung Lam  4 , Hang-Long Li  4 , Gloria Hoi-Yee Li  5 , Shun-Cheong Ho  1 , Ching Lung Cheung  1   2
Affiliations

Prevalence, incidence, and survival analysis of interstitial lung diseases in Hong Kong: a 16-year population-based cohort study

Yisha Ye et al. Lancet Reg Health West Pac. .

Abstract

Background: Published data on the epidemiology of interstitial lung disease (ILD) in Asia is scarce. Understanding the epidemiology is important for authorities in the health management planning. This study aimed to estimate the prevalence, incidence, and survival of ILD in Hong Kong from 2005 to 2020 and evaluate the change of trend over time.

Methods: In this retrospective cohort study, we identified ILD patients between 2005 and 2020 using a territory-wide electronic health record database. Prevalence, incidence rates, and age- and sex-standardised incidence rates with United Nations population in 2020 as a reference were estimated. Trends in prevalence and incidence were analysed using joinpoint regression and the average annual percent change (AAPC) was estimated. Median survival, and risk factors of mortality were evaluated using Cox proportional hazard regression.

Findings: We identified 5924 patients and included 5884 of them for analysis. The prevalence of ILD increased from 24.7 to 33.6 per 100,000 population from 2005 to 2020 with an AAPC of 1.94 (95% confidence interval, CI: 1.69-2.34). The standardized incidence rate decreased from 5.36 to 2.57 per 100,000 person from 2005 to 2020 (AAPC -3.56, 95% CI, -4.95 to -1.78). The median survival of ILD was 2.50 (95% CI, 2.32-2.69) years. Male, older age, higher Charlson comorbidity index, and IIP subtype were associated with increased mortality with statistical significance.

Interpretation: This study provided the first epidemiological evaluation of ILD in Hong Kong. Further studies on ILD in multiple Asian cities and countries are warranted.

Funding: None.

Keywords: Electronic health record; Epidemiology; Idiopathic interstitial pneumonia; Interstitial lung disease; Mortality.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Fig. 1
Fig. 1
Flow diagram of patient selection.
Fig. 2
Fig. 2
Prevalence of ILD in Hong Kong, 2005–2020.
Fig. 3
Fig. 3
Incidence rate of ILD in Hong Kong, 2005–2020.
See this image and copyright information in PMC

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