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Updated: May 24, 2026

Comprehensive & Cost Effective Laboratory Monitoring of HIV/AIDS: an African Role Model
Published on: October 31, 2010
[Impact of delayed diagnoses bias on the estimation of AIDS incubation]
Hui-xin Liu1, Lu Wang, Qian-qian Qin
1National Center for AIDS/STD Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 102206, China; School of Public Health, Peking Union Medical College.
Objective:
Using the HIV positive paid blood donors (PBDs) as example, to investigate the impact of the delayed diagnosed HIV/AIDS patients on the calculated median incubation of AIDS.
Methods:
Information was retrospectively collected on HIV/AIDS patients who were infected through paid blood donation. Data was from the national HIV/AIDS case reporting system. The time of diagnosed HIV/AIDS after the screening was defined as delayed diagnoses. All the cases were diagnosed between Jan. 1(st) 1995 and the end of the screening were classified as group 1, while the cases diagnosed between Jan. 1(st) 1995 and Dec. 31(st) 2010 were classified as group 2. Kaplan-Meier method was used to calculate the median AIDS incubation of cases from the two groups. Results from the two groups on their incubation periods were compared.
Results:
From the data of group 1, we noticed that the median AIDS incubation was 9.62 years but the 95%CI were not provided in the results of SAS software. When using the data from group 2, we found that the median AIDS incubation was 9.83 years, with the 95%CI as 9.73 to 9.83 years.
Conclusion:
Our data showed that, if excluding the delayed diagnosed cases, the AIDS incubation periods were shorter and biased.
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