Table 1

Top five information-rich ngrams identified through χ2 feature selection in each categorisation task

Ngramsχ2 value
Communication/handoff failurefall nurs order emerg depart depart3786.7
2793.9
2462.0
1902.3
1853.6
Policy/procedure issuemin later fall polici glucomet glucose glucos run1714.5
1474.9
1429.4
1408.1
1373.5
Technology issuecgi field dose system medconnect4917.1
1664.5
1646.7
1488.2
1425.2
Lapse/slipdose pharmacy order pharmacist med2158.7
1520.0
929.4
901.2
664.2
Distractions/interruptionsdata entri vaccin error tablet medic1686.5
1467.1
1452.1
1437.0
895.2
  • The words are stemmed.