Machine Learning Approaches to Predict Patient’s Length of Stay in Emergency Department

Table 3

Descriptive statistical results of categorical variables.

Categorical attribute	Attribute type	Details	Occurrence (%)	Number of records
Day of the month	Input	1, 2, 9, 12, 13, 15, 18, 22, 23, 28	10.0 each	40 each
Month	Input	1, 2, 3, 4, 5, 6, 7, 8, 9, 10	10.0 each	40 each
Day	Input	1: Friday	13.0	52
		2: Saturday	15.0	60
		3: Sunday	13.5	54
		4: Monday	13.5	54
		5: Tuesday	15.0	60
		6: Wednesday	15.5	62
		7: Thursday	14.5	58
Year	Input	2019	50.0	200
		2020	50.0	200
Gender	Input	1: female	46.5	186
		2: male	53.5	214
Insurance	Input	1: insured	74.0	296
		0: cash	26.0	104
Mode of arrival	Input	1: ambulatory	53.5	214
		2: ambulance	46.5	186
Immediate treatment	Input	0: not taken	99.5	398
		1: taken	0.5	2
Triage level	Input	1: level 1	0.5	2
		2: level 2	2.0	8
		3: level 3	20.5	82
		4: level 4	57.3	229
		5: level 5	19.7	79
Medication	Input	1: taken	54.0	216
		0: not taken	46.0	184
Consultation	Input	1: taken	75.0	300
		0: not taken	25.0	100
CBC	Input	1: taken	25.7	103
		0: not taken	74.3	297
KFT	Input	1: taken	17.5	70
		0: not taken	82.5	330
LFT	Input	1: taken	4.7	19
		0: not taken	95.3	381
Cardiac enzymes	Input	1: taken	6.8	27
		0: not taken	93.2	373
RBS	Input	1: taken	3.0	12
		0: not taken	97.0	388
CRB	Input	1: taken	4.5	18
		0: not taken	95.5	382
Amylase	Input	1: taken	1.0	4
		0: not taken	99.0	396
Lipase	Input	1: taken	2.3	9
		0: not taken	97.7	391
Urine analysis	Input	1: taken	6.0	24
		0: not taken	94.0	376
Stool analysis	Input	1: taken	1.3	5
		0: not taken	98.7	395
ABGS	Input	1: taken	0.5	2
		0: not taken	99.5	398
PT, INR	Input	1: taken	1.8	7
		0: not taken	98.2	393
PTT	Input	1: taken	0.3	1
		0: not taken	99.7	399
Urine culture	Input	1: taken	0.3	1
		0: not taken	99.7	399
Urea	Input	1: taken	0.5	2
		0: not taken	99.5	398
Creatinine	Input	1: taken	1.0	4
		0: not taken	99.0	396
Troponin	Input	1: taken	1.0	4
		0: not taken	99.0	396
Xray	Input	1: taken	15.8	63
		0: not taken	84.2	337
Ultrasound	Input	1: taken	1.8	7
		0: not taken	98.2	393
CT scan	Input	1: taken	2.8	11
		0: not taken	97.2	389
MRI	Input	1: taken	0.8	3
		0: not taken	99.2	397
Others	Input	1: taken	23.3	93
		0: not taken	76.7	307
BMP	Input	1: taken	2.8	11
		0: not taken	97.2	389
Lockdown	Input	0: no lockdown	63.0	252
		1: lockdown	6.0	24
		2: partial ban from 6 pm to 10 am, walking on foot	1.5	6
		3: part-time and work permits granted	4.0	16
		4: odd, even cars from 8 am to 7 pm	3.5	14
		5: partial ban 11 pm–6 am	0.5	2
		6: partial ban 1 pm–6 am	2.5	10
		7: partial ban 12 pm–6 am	19.0	76
CAT	Output	3 categories:
		1: 0–100	83.0	332
		2: 101–200	14.3	57
		3: 201–300	2.7	11
		5 categories:
		1: 0–60	53.0	212
		2: 61–120	34.5	138
		3: 121–180	8.0	32
		4: 181–240	2.8	11
		5: 241–300	1.7	7