Table 5 Multivariate Poisson regression analysis of difficult-to-transfer cases in children

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