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J Am Med Inform Assoc 16:220-227 doi:10.1197/jamia.M3007
  • Original Investigation

Using Empiric Semantic Correlation to Interpret Temporal Assertions in Clinical Texts

Table 1

Linear Regression Model Variables

Variable Definition Coefficient Significance
Value stated numeric value in the temporal assertion (1–30 in this sample) 0.0414 <0.001
Round Number true if value is a multiple of 5 (any unit) or 6 (with months) −0.0218 0.002
ln(duration) logarithm of stated duration in days, which equals the product of unit and value 0.1500 0.023
Gt 18 yrs true if duration ≥ 18 yrs, so the event should not be in the database 0.8160 <0.001
Intercept 0.4060 0.416

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