Table 1

Weight of trained artificial neural network for PCR response

		First hidden layer					Second hidden layer
		Node 1	Node 2	Node 3	Node 4	Node 5	Node 1	Node 2	Node 3
Input layer	Drug addiction
	No	0.12	−0.822	−0.414	0.053	−0.503
	Yes	−0.8	0.32	−0.055	0.211	0.241
	Respiratory rate
	5–10	−0.271	−0.133	0.228	0.143	−0.343
	10–14	0.02	0.42	0.412	−0.119	0.216
	14–18	−0.548	−0.173	−0.032	0.149	−0.408
	18–22	0.087	−0.309	0.25	0.258	0.297
	22–28	0.153	−0.241	−0.289	−0.049	0.288
	≥28	−0.212	0.291	0.026	−0.251	−0.203
	Contact
	No	−0.002	−0.115	0.361	−0.36	0.517
	Yes	0.345	−0.247	−0.169	−0.277	−0.264
	Cough
	No	0.032	0.428	−0.197	0.471	0.408
	Yes	−0.251	0.271	0.325	0.232	0.064
	Sore throat
	No	0.436	−0.439	−0.182	−0.319	0.397
	Yes	0.373	−0.234	0.264	0.399	−0.505
	Chest pain
	No	0.442	−0.433	−0.445	−0.357	−0.141
	Yes	0.356	−0.39	0.192	0.212	−0.088
	Dyspnoea
	No	−0.314	0.21	0.216	−0.474	0.319
	Yes	0.146	−0.248	−0.225	0.432	0.222
	Respiratory distress
	No	−0.625	0.115	0.562	−0.367	0.003
	Yes	0.444	−0.761	−0.018	−0.594	−0.313
	Dizziness
	No	−0.303	−0.019	0.077	0.11	0.071
	Yes	0.001	−0.05	−0.41	−0.076	0.427
	Headache
	No	−0.046	−0.144	0.358	−0.358	−0.128
	Yes	−0.369	−0.19	−0.196	0.291	0.021
	Myalgia
	No	−0.297	0.316	0.164	0.435	−0.044
	Yes	0.299	−0.254	0.217	0.118	−0.374
	Reduced consciousness
	No	0.448	−0.179	−0.39	−0.343	−0.259
	Yes	−0.133	0.228	−0.054	0.222	0.027
	Hyposmia
	No	0.258	0.024	0.298	−0.455	−0.396
	Yes	0.34	0.075	0.338	−0.33	−0.467
	Paresis
	No	0.127	0.348	0.072	−0.117	0.16
	Yes	0.004	0.395	0.278	0.396	0.152
	Weakness
	No	0.641	−0.263	0.25	0.272	0.377
	Yes	0.033	−0.259	−0.257	−0.438	−0.031
	Tremor
	No	0.183	−0.327	−0.21	−0.141	−0.123
	Yes	0.17	0.507	0.024	0.377	0.089
	Nausea
	No	−0.184	0.342	0.086	0.413	0.304
	Yes	−0.092	0.3	−0.223	−0.194	−0.336
	Vomiting
	No	0.183	−0.075	0.251	0.142	0.252
	Yes	0.207	0.284	0.042	0.422	0.102
	Diarrhoea
	No	−0.262	−0.103	0.465	−0.103	0.027
	Yes	0.505	0.169	−0.38	−0.124	−0.356
	Anorexia
	No	−0.271	0.323	−0.007	−0.019	−0.228
	Yes	0.101	0.197	−0.176	0.199	−0.216
	Age	0.244	−0.193	0.09	−0.154	−0.18
	Duration	10.058	−0.782	−0.18	−0.86	−0.06
	Saturation by pulse oximetry	−0.678	0.45	−0.144	−0.019	0.452
	Temperature	−0.439	0.36	−0.039	0.085	−0.086
Second hidden layer	Node 1	0.306	0.111	0.151	−0.274	0.055
	Node 2	−1.057	0.492	−0.427	−0.053	1.392
	Node 3	0.215	−0.106	−0.21	−0.017	0.007
Output layer	PCR
	Negative						0.707	0.963	−0.054
	Positive						−0.721	−0.792	0.317