Table 15 Extracted supporting rules for ICU days prediction (75% – 85% accuracy)

(AIRWAY = 'No Need') and ED-RESP < 21 and ED-BP < 142 ED- PULSE < 79 and 37.05 ≤ AGE < 44.15 Then ICU stay days ≤ 2

(AIRWAY = 'No Need') and AGE ≥ 52.9 and ED-BP ≥ 141 Then ICU stay days ≤ 2

(AIRWAY = 'Need') and 117 ≤ ED-BP < 135 and ED-RESP < 19 and 68 ≤ ED-PULSE < 138 and 15.05 ≤ AGE < 46.4 Then ICU stay days ≥ 3

(AIRWAY = 'Need') and 136 ≤ ED-BP < 150 and ED-RESP < 19 and ED-PULSE < 138 and 15.05 ≤ AGE < 23.25 Then ICU stay days ≥ 3

(AIRWAY = 'No Need') and 96 ≤ ED-BP < 163 and 39.15 ≤ AGE < 69.05 Then ICU stay days ≤ 2

(AIRWAY = 'Need') and ED-BP < 156 and AGE ≥ 24.35 Then ICU stay days ≥ 3

(AIRWAY = 'Need') and ED-BP < 146 and AGE < 17.85 and 135 ≤ ED-PULSE < 181 Then ICU stay days ≥ 3

(AIRWAY = 'Need') and ED-BP < 146.5 and AGE < 17.85 and ED- PULSE < 131 and ED-RESP < 18 Then ICU stay days ≥ 3

(AIRWAY = 'No Need') and ED-BP ≥ 141 Then ICU stay days ≤ 2

(AIRWAY = 'Need') and ED-BP < 114 Then ICU stay days ≥ 3

(AIRWAY = 'Need') and 114 ≤ ED-BP < 135.5 and ED-PULSE < 97 and 17.2 ≤ AGE < 46.95 and ED-RESP < 7 Then ICU stay days ≥ 3

(AIRWAY = 'No Need') and AGE ≥ 52.9 and ED-BP ≥ 141 Then ICU stay days ≤ 2

(AIRWAY = 'Need') and ED-BP < 114 Then ICU stay days ≥ 3

(AIRWAY = 'Need') and 110.5 ≤ ED-BP < 180.5 and ED- PULSE ≥ 62 and 4.35 ≤ AGE < 44.5 and ED-GCS < 10 Then ICU stay days ≥ 3

(AIRWAY = 'No Need') and AGE ≥ 37 and 135 ≤ ED-BP < 163 Then ICU stay days ≤ 2

(AIRWAY = 'No Need') and 37.05 ≤ AGE < 55.6 and ED-GCS ≥ 11 and 88 ≤ ED-BP < 163 Then ICU stay days ≤ 2

ED-BP > 100 and ED-RESP > 19 Then ICU stay days ≤ 2