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Table 2 Results for the Swedish adaption of NegEx

From: Negation detection in Swedish clinical text: An adaption of NegEx to Swedish

Sentences with negation trigger phrases

English (%)

Swedish (%) (95% CI)

Recall (sensitivity)

82.4

81.9 (77.3 - 86.4)

Specificity

82.5

74.7 (69.6 - 79.7)

Precision (positive predictive value)

84.5

75.2 (70.2 - 80.1)

Negative predictive value

80.2

81.4 (76.7 - 86.1)

Sentences without negation trigger phrases

English (%)

Swedish (%) (95% CI)

Negative predictive value

97.0

96.5 (94.5 - 98.6)

  1. Recall: No. of correctly detected negated propositions divided by no. of manually rated negated propositions. Specificity: No. of propositions correctly detected as not negated divided by no. propositions that were manually rated as not negated. Precision: No. of correctly detected negated propositions divided by total no. of propositions that NegEx classified as negated. Negative predictive value: No. of propositions that NegEx correctly did not classify as negated divided by total no. of propositions that NegEx did not classify as negated. (Figures for English from Chapman et al. [1].)