Table 5.

Multivariate Poisson regression analysis of difficult-to-transfer cases in children

	Risk Ratio	95% confidence interval			P value
Year
2018	Reference
2019	1.03	0.90	−	1.18	0.704
2020	1.14	0.98	−	1.32	0.081
Month
June	Reference
January	0.75	0.57	−	0.99	0.041
February	0.82	0.62	−	1.09	0.18
March	1.16	0.89	−	1.50	0.28
April	0.90	0.68	−	1.19	0.446
May	0.92	0.70	−	1.21	0.549
July	0.83	0.63	−	1.09	0.18
August	0.90	0.69	−	1.19	0.466
September	1.02	0.78	−	1.34	0.888
October	1.01	0.77	−	1.33	0.931
November	1.03	0.79	−	1.36	0.806
December	0.72	0.54	−	0.97	0.03
Time of transportation
9 am to 10 am	Reference
0 am to 1 am	2.26	1.23	−	4.13	0.008
1 am to 2 am	2.15	1.15	−	4.03	0.017
2 am to 3 am	1.94	0.99	−	3.82	0.053
3 am to 4 am	1.56	0.74	−	3.27	0.238
4 am to 5 am	0.82	0.32	−	2.12	0.689
5 am to 6 am	1.07	0.44	−	2.63	0.874
6 am to 7 am	0.72	0.26	−	1.98	0.528
7 am to 8 am	0.67	0.26	−	1.73	0.414
8 am to 9 am	1.30	0.66	−	2.57	0.453
10 am to 11 am	1.31	0.68	−	2.51	0.423
11 am to 12 pm	1.35	0.72	−	2.52	0.346
12 pm to 1 pm	2.06	1.16	−	3.67	0.013
1 pm to 2 pm	1.54	0.86	−	2.77	0.147
2 pm to 3 pm	1.31	0.72	−	2.37	0.376
3 pm to 4 pm	2.16	1.24	−	3.79	0.007
4 pm to 5 pm	2.06	1.18	−	3.60	0.011
5 pm to 6 pm	2.76	1.61	−	4.74	< 0.001
6 pm to 7 pm	3.16	1.85	−	5.39	< 0.001
7 pm to 8 pm	3.17	1.85	−	5.41	< 0.001
8 pm to 9 pm	2.54	1.48	−	4.38	0.001
9 pm to 10 pm	3.05	1.78	−	5.24	< 0.001
10 pm to 11 pm	3.71	2.16	−	6.38	< 0.001
11 pm to 0 am	3.08	1.76	−	5.40	< 0.001
Day of week
Friday	Reference
Monday	1.18	0.94	−	1.48	0.156
Tuesday	0.98	0.77	−	1.25	0.895
Wednesday	0.95	0.75	−	1.21	0.687
Thursday	1.18	0.94	−	1.49	0.151
Saturday	1.37	1.11	−	1.70	0.004
Sunday	1.37	1.11	−	1.70	0.003
Suspected COVID-19	1.72	0.25	−	12.08	0.584