Table 1 Factors related to the death of patients hospitalized due to COVID-19 in the population insured by Iran Health Insurance Organization until March 20, 2021 (based on the multiple logistic regression model)

Insurance fund

Iranian Fund

18,070

15.43

3,298

15.43

Ref

Rural Fund

100,405

87.81

13,943

12.19

0.75

0.72

0.79

P < 0.001

Other Social Strata

33,076

89.95

6,800

17.05

0.92

0.87

0.98

P < 0.001

Foreign Citizens Fund

1,445

77.44

421

22.56

1.45

1.28

1.66

P < 0.001

Universal health insurance

45,853

88.08

6,206

11.92

0.84

0.81

0.89

P < 0.001

Fund of the Civil Servants

62,328

83.99

11,880

16.01

0.82

0.79

0.87

P < 0.001

Age group

 < 20

14,111

95.25

703

4.75

Ref

20–30

13,092

95.88

562

4.12

1.15

1.03

1.3

P < 0.001

30–40

26,073

94.94

1,389

5.06

1.45

1.32

1.6

P < 0.001

40–50

32,335

92.93

2,459

7.07

2.09

1.92

2.3

P < 0.001

50–60

44,954

90.18

4,895

9.82

2.89

2.66

3.15

P < 0.001

60–70

54,362

85.48

9,232

14.52

4.39

4.05

4.78

P < 0.001

70–80

41,066

79.97

10,287

20.03

6.48

5.96

7.03

P < 0.001

 > 80

35,327

73.04

13,040

26.96

9.65

8.89

10.49

P < 0.001

Gender

Male

131,635

84.64

23,883

15.36

Ref

Female

129,685

87.41

18,684

12.59

0.81

0.8

0.84

P < 0.001

ICU Admission

No

221,330

92.29

18,499

7.71

Ref

Yes

39,990

62.43

24,068

37.57

7.49

7.32

7.67

P < 0.001

Hospital Type

Private

3,607

88

492

12

Ref

charity

690

83.43

137

16.57

1.73

1.37

2.19

P < 0.001

Government universities hospitals

254,024

85.93

41,584

14.07

2.08

1.87

2.31

P < 0.001

Other government hospitals

1,178

85.86

194

14.14

1.45

1.19

1.77

P < 0.001

Non-governmental public

1,823

91.92

160

8.08

0.98

0.8

1.2

P < 0.001

Month of admission

2020-February

705

85.56

119

14.44

Ref

2020-March

16,283

86.17

2613

13.83

0.46

0.66

0.32

P < 0.001

2020-April

15,490

86.99

2317

13.01

0.33

0.48

0.23

P < 0.001

2020-May

13,138

88.49

1709

11.51

0.25

0.37

0.18

P < 0.001

2020-June

17,229

88.22

2300

11.78

0.31

0.44

0.21

P < 0.001

2020-July

25,414

86.13

4093

13.87

0.39

0.57

0.27

P < 0.001

2020-August

20,025

85.66

3351

14.34

0.39

0.56

0.27

P < 0.001

2020-September

19,300

86.9

2909

13.1

0.33

0.48

0.23

P < 0.001

2020-October

29,168

84.47

5361

15.53

0.42

0.6

0.29

P < 0.001

2020-November

39,523

83.64

7728

16.36

0.49

0.7

0.34

P < 0.001

2020-December

23,902

84.39

4420

15.61

0.37

0.53

0.26

P < 0.001

2021-January

15,390

86.51

2400

13.49

0.3

0.44

0.21

P < 0.001

2021-February

14,763

88.74

1874

11.26

0.26

0.37

0.18

P < 0.001

2021-March

10,990

88.89

1373

11.11

0.24

0.34

0.16

P < 0.001