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

Rules Test Acc. Method
(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 13/16(81.3%) CART
(AIRWAY = 'No Need') and AGE ≥ 52.9 and ED-BP ≥ 141 Then ICU stay days ≤ 2 12/15(80%) CART
(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 23/28(82.1%) CART
(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 10/13(77%) CART
(AIRWAY = 'No Need') and 96 ≤ ED-BP < 163 and 39.15 ≤ AGE < 69.05 Then ICU stay days ≤ 2 44/55(80%) CART
(AIRWAY = 'Need') and ED-BP < 156 and AGE ≥ 24.35 Then ICU stay days ≥ 3 76/96(79.2%) CART
(AIRWAY = 'Need') and ED-BP < 146 and AGE < 17.85 and 135 ≤ ED-PULSE < 181 Then ICU stay days ≥ 3 9/11(81.2%) CART
(AIRWAY = 'Need') and ED-BP < 146.5 and AGE < 17.85 and ED- PULSE < 131 and ED-RESP < 18 Then ICU stay days ≥ 3 15/20(75%) CART
(AIRWAY = 'No Need') and ED-BP ≥ 141 Then ICU stay days ≤ 2 223/265(84.2%) CART
(AIRWAY = 'Need') and ED-BP < 114 Then ICU stay days ≥ 3 44/52(84.6%) CART
(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 10/13(77%) CART
(AIRWAY = 'No Need') and AGE ≥ 52.9 and ED-BP ≥ 141 Then ICU stay days ≤ 2 12/15(80%) CART
(AIRWAY = 'Need') and ED-BP < 114 Then ICU stay days ≥ 3 44/52(84.6%) CART
(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 35/46(76.1%) CART
(AIRWAY = 'No Need') and AGE ≥ 37 and 135 ≤ ED-BP < 163 Then ICU stay days ≤ 2 31/35(88.6%) CART
(AIRWAY = 'No Need') and 37.05 ≤ AGE < 55.6 and ED-GCS ≥ 11 and 88 ≤ ED-BP < 163 Then ICU stay days ≤ 2 40/49(81.6%) CART
ED-BP > 100 and ED-RESP > 19 Then ICU stay days ≤ 2 145/180(80.6%) C4.5
1. Though these rules are not reliable enough for practical use, they can contain pattern information which may be of interest to physicians. ED-BP is Emergency Department Blood Pressure; ED-RESP is Emergency Department Respiratory Rate; ED-PULSE is Emergency Department Pulse Rate; ED-GCS is Emergency Department Glasgow Coma Score.