Table 1.

Visits associated with each variable value used in the clinical order prediction model

Category	Variable	ED		UCC 1		UCC 2
		n	%	n	%	n	%
Acuity	High	37 341	58.53	18 621	36.28	5794	22.69
	Low	26 457	41.47	32 702	63.72	19 741	77.31
Age	16-24 y	740	1.16	7	0.01	5	0.02
	25-44 y	9492	14.85	9028	17.56	4149	16.25
	45-64 y	20 571	32.19	15 119	29.41	6897	27.01
	65-74 y	16 391	25.65	14 492	28.19	7088	27.76
	75+ y	16 712	26.15	12 768	24.83	7396	28.96
Complaint concept (top 5)	Pain	18 010	28.00	9433	17.89	7192	27.15
	Chest	3606	5.61	1627	3.08	749	2.83
	Shortness of breath	3400	5.29	1009	1.91	431	1.63
	Abdomen	3243	5.04	677	1.28	447	1.69
	Chest pain	2841	4.42	761	1.44	507	1.91
Sex	Male	59 259	92.73	47 363	92.12	23 193	90.83
	Female	4647	7.27	4051	7.88	2342	9.17
Order history (top 5)	Creatinine eGFR panel	18 902	29.58	9569	18.61	2093	8.20
	Glucose	18 898	29.57	9549	18.57	2086	8.17
	Urea nitrogen	18 898	29.57	9567	18.61	2088	8.18
	Electrolyte panel	18 881	29.54	9611	18.69	2090	8.18
	CBC with diff (BHS)	18 796	29.41	9524	18.52	1607	6.29
Problem list (top 5)	Health status factors	42 639	72.19	36 830	76.29	17 892	75.32
	Musculoskeletal and connective tissue	40 431	68.45	31 428	65.10	16 283	68.55
	Endocrine, nutrition, metabolic	39 877	67.52	31179	64.58	14 947	62.92
	Circulatory system	39 526	66.92	29 106	60.29	13 708	57.71
	Mental diseases and disorders	34 813	58.94	33 684	69.77	16 119	67.86
Shift	Day	37 850	59.23	35 427	68.91	24 931	97.63
	Evening	19 786	30.96	11 070	21.53	184	0.72
	Night	6270	9.81	4917	9.56	420	1.64
Source of arrival (top 5)	Nonreferred	17 421	82.30	23 097	80.64	6179	87.97
	Offsite clinic	1442	6.81	0	0.00	56	0.80
	Other	1112	5.25	0	0.00	0	0.00
	Onsite clinic	463	2.19	769	2.68	506	7.20
	Offsite nursing home	268	1.27	0	0.00	0	0.00
Vital signs	Pulse oximetry normal	57 687	98.64	46 392	99.19	22 765	99.31
	Systolic normal	48 294	81.80	40 820	85.01	19 388	83.96
	Pulse normal	47 193	79.85	38 906	81.01	18 834	81.36
	Diastolic normal	46 638	79.03	37 730	78.60	18 772	81.36
	Respiration normal	45 737	77.50	44 008	91.79	20 140	87.34
	No pain	24 714	42.42	23 232	48.85	7462	32.67
	Temperature normal	17 632	30.08	11 905	25.06	7561	33.05

BHS: Boston Healthcare System; CBC: complete blood count; ED: emergency department; eGFR: estimated glomerular filtration rate; UCC: urgent care center.