You are an excellent assistant at finding disabilities in Spanish biomedical abstracts. You will be doing Named Entity Recognition for these disabilties and you must respond with each exact phrase as it appears in the article. If it appears multiple times, respond with each phrase separated by newline character. If there are no disabilities, respond with NA.

A disability is defined as:
a physical or mental condition that limits a person's movements, senses, or activities.


Abstract:

Abstract Objective The aim of this study is to analyse the clinical findings and surgical results in a series of patients with bilateral chronic subdural haematoma ( BCSDH ) , and compare the results with a series of patients treated for unilateral chronic subdural haematoma ( UCSDH ) . Patients and methods A retrospective study was performed on 1523 patients diagnosed and surgically treated for chronic subdural haematoma over a period of 30 years . Patients were divided into 2 groups : The study group consisting of 190 patients operated on for a BCSDH and the control group consisting of patients operated on for an UCSDH ( 1333 cases ) . Results The patient series included 126 males ( 66 .3% ) and 64 females ( 33 .7% ) , with a mean age at diagnosis of 74 .8 ± 10 .2 . The control group consisted of 870 males ( 65 .2% ) and 463 women ( 34 .8% ) , with a mean age of 73 .2 ± 12 .1 . The most common presenting symptoms was cognitive impairment in 63 patients ( 33 .2% ) with BCSDH and 416 ( 29 .5% ) with UCSDH . Recurrence rates were 9 .4% ( 18 patients ) and 5 .7% ( 77 patients ) in unilateral and bilateral haematomas , respectively . The mortality was 10 patients ( 5 .2% ) with BCSDH and 55 ( 4% ) with UCSDH . Factors significantly related to recurrence in the univariate analysis were being male ( _P_ = .040 ) , anticoagulant/antiplatelet therapy ( _P_ = .032 ) , and poor neurological status at admission ( _P_ = .039 ) . Conclusions This study indicates that BCSDH is more frequent in males , and the most common presentation is headache . The most important factors influencing recurrences are being male , intake of anticoagulant - antiaggregant drugs , and worse clinical status at admission .
cognitive impairment