| Summary: | <p>Abstract</p> <p>Background</p> <p>Most methods for negation detection in clinical text have been developed for English text, and there is a need for evaluating the feasibility of adapting these methods to other languages. A Swedish adaption of the English rule-based negation detection system NegEx, which detects negations through the use of trigger phrases, was therefore evaluated.</p> <p>Results</p> <p>The Swedish adaption of NegEx showed a precision of 75.2% and a recall of 81.9%, when evaluated on 558 manually classified sentences containing negation triggers, and a negative predictive value of 96.5% when evaluated on 342 sentences not containing negation triggers.</p> <p>Conclusions</p> <p>The precision was significantly lower for the Swedish adaptation than published results for the English version, but since many negated propositions were identified through a limited set of trigger phrases, it could nevertheless be concluded that the same trigger phrase approach is possible in a Swedish context, even though it needs to be further developed.</p> <p>Availability</p> <p>The triggers used for the evaluation of the Swedish adaption of NegEx are available at <url>http://people.dsv.su.se/~mariask/resources/triggers.txt</url> and can be used together with the original NegEx program for negation detection in Swedish clinical text.</p>
|
|---|