. 2021 Sep 8;21:931. doi: 10.1186/s12879-021-06614-6

Table 1.

Characteristics of Patients in the training and testing Cohorts

Characteristic	Training cohort			Testing cohort
Characteristic	COVID-19	Other types of-pneumonia	P value	COVID-19	Other types of pneumonia	p value
Patients	52	60	–	11	11	–
Exams	206	69	–	38	13	–
Age	52.7 ± 12.6	41.5 ± 15.5	< 0.001^b	47.5 ± 16.1	46.9 ± 18.4	0.942^b
Gender, Male (%)	31 (60%)	33 (55%)	0.623^a	5 (45%)	8 (73%)	0.387^a
Exposure history			0.006^a			0.375^a
Close contact with infected patients	52 (100%)	52(87%)		8 (73%)	6 (55%)
Unknown cause	0 (0%)3	8(13%)		3 (27%)	5 (45%)
Comorbidities, No. (%)
Cardiovasular disease	1 (2%)	1(2%)	1.000^a	2 (18%)	1 (9%)	0.534^a
Diabetes	4 (8%)	0(0%)	0.029^a	0 (0%)	0 (0%)	–
Hypertension, No. (%)	9 (17%)	4(7%)	0.080^a	0 (0%)	1 (9%)	0.317^a
COPD	3 (6%)	2(3%)	0.535^a	0 (0%)	0 (0%)	–
Chronic liver disease	2 (4%)	1(2%)	0.478^a	0 (0%)	0 (0%)	–
Chronic kidney disease	0 (0%)	0(0%)	–	0 (0%)	1 (9%)	0.317^a
Cancer, No. (%)	0 (0%)	1(2%)	0.352^a	1 (9%)	2 (18%)	0.544^a
Symptoms
Fever, No. (%)	46 (88%)	46 (77%)	0.104^a	6 (55%)	7 (64%)	0.672^a
Cough, No. (%)	43 (83%)	26 (43%)	< 0.001^a	6 (55%)	3 (27%)	0.387^a
Myalgia, No. (%)	10 (19%)	2 (3%)	0.007^a	2 (18%)	0 (0%)	0.476^a
Fatigue, No. (%)	18 (35%)	2 (3%)	< 0.001^a	0 (0%)	0 (0%)	–
Headache, No. (%)	9 (17%)	1 (2%)	0.01^a	2 (18%)	0 (0%)	0.476^a
Nausea, No. (%)	5 (10%)	0 (0%)	0.046^a	2 (18%)	0 (0%)	0.476^a
Diarrhea, No. (%)	7 (13%)	1 (2%)	0.04^a	1 (9%)	0 (0%)	1.000^a
Bellyache, No. (%)	0 (0%)	0 (0%)	–	1 (9%)	0 (0%)	1.000^a
Dyspnea, No. (%)	1 (2%)	0 (0%)	0.464^a	0 (0%)	0 (0%)	–
Other symptoms, No. (%)	19 (37%)	14 (23%)	0.126^a	4 (36%)	2 (18%)	0.635^a
Laboratory results
White blood cell count	4.8 ± 2.0	8.2 ± 3.5	< 0.001^b	5.1 ± 1.8	9.4 ± 3.4	0.001^b
Number of neutrophils, × 10⁹/L	3.2 ± 1.9	5.8 ± 3.2	< 0.001^b	3.2 ± 1.5	6.8 ± 3.3	0.003^b
Lymphocyte count, × 10⁹/L	1.2 ± 0.8	1.6 ± 1.1	0.032^b	1.4 ± 0.5	1.7 ± 1.0	0.473^b
Hemoglobin	134.1 ± 25.2	138.7 ± 17.6	0.267^b	128.3 ± 19.8	139.7 ± 21.3	0.206^b
Platelet count, × 10⁹/L	175.8 ± 60.3	225.6 ± 62.0	< 0.001^b	215.6 ± 70.7	230.1 ± 89.0	0.678^b

p^a chi-square test, p^b Student’s t test. p^c Kruskal–Wallis H test