Risk factors associated with tuberculosis recurrence in South Korea determined using a nationwide cohort study

Objective Prevention of tuberculosis (TB) recurrence is an important issue in TB control. South Korea, a country with a high average income, has been challenged with an intermediate burden of TB. We aimed to estimate the TB recurrence rate after successful completion of the first anti-TB chemotherapy, and to identify the risk factors for the TB recurrence by focusing on co-morbidities and behavioral factors. Methods This is a population-based cohort study using data from the National Health Insurance (NHI) database between 2002 and 2013. Newly diagnosed TB patients were identified using the classification of disease codes and prescription records. Final analytical subjects included people who successfully completed the first anti-TB chemotherapy. The primary outcome measure was recurrent TB 6-month after the first treatment completion. A set of associated risk factors, including demographic characteristics, co-morbidities, and health behavior factors were analyzed using Cox regression analysis. Results Among 5,446 TB patients, 2,226 (40.1%) completed the first anti-TB treatment. During the follow-up period, 150 (6.7%) patients had TB recurrence, and the crude recurrent rate was 22.6 per 1000 person-years. The majority of recurrence cases (89%) occurred within the first 2-year period. The major findings show that participants who are male (adjusted HR (aHR) =1.81, at a 95% CI, range: 1.11-2.94), older in age (aHR = 1.07, at a 95% CI, range: 1.00-1.14), have a lower income (aHR = 1.96, at a 95% CI, range: 1.10-3.48) and who are underweight (aHR = 1.92, at a 95% CI, range 1.15-3.20) were at higher risks for TB recurrence. Conclusion People who have risk factors for recurrent TB need to improve treatment compliance through more effective TB management, and follow-up observation for one or two years after the treatment completion.

Automated summary

This study aimed to estimate the TB recurrence rate in South Korea after successful completion of the first anti-TB chemotherapy and identify the risk factors for recurrence. The results showed that male gender, older age, lower income, and being underweight were associated with a higher risk of TB recurrence. These findings highlight the importance of effective TB management and follow-up observation for individuals with these risk factors.