Length of exposure to antiphospholipid antibodies, rather than age, is a risk factor for thrombosis: a retrospective single-centre observational study.

To investigate the association of age and other factors with thrombosis risk in antiphospholipid antibody (aPL) carriers, a retrospective observational study was conducted in a cohort of patients with medium-high aPL titres recruited in a tertiary care hospital. Assuming an age difference of 9.8 years between patients with and without thrombosis, we estimated that a sample size of 70 participants was required.

[Epidemiological characteristics of new HIV infections compared with AIDS cases. The HIV/AIDS epidemic in the Basque Country].

Objective: To describe the epidemiological characteristics of new cases of HIV infection diagnosed from 1997-2001 and compare them with AIDS cases (1991-2001).

Methods: Data were retrospectively collected on new cases of HIV infection detected in the Basque Country (1997-2001) and were compared with AIDS cases (1991-2001).

Results: A total of 912 new cases of HIV infection were diagnosed.