Table 1 Characteristics of patients at baseline, stratified by month of admission.

Total (No.)

270,624

5743

37,599

32,483

25,405

53,128

70,187

44,007

2072

Sex (No.,%)

Women

134,693 (49.8)

2764 (48.1)

18,140 (48.2)

15,801 (48.6)

12,390 (48.8)

26,106 (49.1)

35,625 (50.8)

22,776 (51.8)

1091 (52.7)

Men

135,931 (50.2)

2979 (51.9)

19,459 (51.8)

16,682 (51.4)

13,015 (51.2)

27,022 (50.9)

34,562 (49.2)

21,231 (48.2)

981 (47.3)

Median age (IQR)

50 (37, 64)

55 (39, 68)

54 (39, 67)

54 (39, 67)

53 (38, 66)

50 (37, 62)

49 (37, 61)

48 (36, 62)

48 (36, 65)

Age (No. %)

< 40

79,161 (29.3)

1488 (25.9)

9604 (25.5)

8178 (25.2)

7014 (27.6)

15,887 (29.9)

22,027 (31.4)

14,276 (32.4)

687 (33.2)

40–49

50,495 (18.7)

871 (15.2)

6192 (16.5)

5321 (16.4)

4200 (16.5)

10,272 (19.3)

14,020 (20)

9227 (21)

392 (18.9)

50–59

52,646 (19.5)

988 (17.2)

7164 (19.1)

5994 (18.5)

4685 (18.4)

10,767 (20.3)

14,727 (21)

7982 (18.1)

339 (16.4)

60–69

45,935 (17.0)

1080 (18.8)

7034 (18.7)

5999 (18.5)

4608 (18.1)

9487 (17.9)

11,603 (16.5)

5844 (13.3)

280 (13.5)

70–79

25,783 (9.5)

778 (13.5)

4591 (12.2)

4202 (12.9)

2969 (11.7)

4176 (7.9)

4946 (7)

3895 (8.9)

226 (10.9)

80–89

13,966 (5.2)

452 (7.9)

2565 (6.8)

2353 (7.2)

1601 (6.3)

2166 (4.1)

2385 (3.4)

2317 (5.3)

127 (6.1)

> 89

2638 (1.0)

1488 (25.9)

9604 (25.5)

8178 (25.2)

7014 (27.6)

15,887 (29.9)

22,027 (31.4)

14,276 (32.4)

687 (33.2)

Nationality (No.,%)

Iranian

262,512 (97.0)

189 (3.3)

995 (2.6)

791 (2.4)

946 (3.7)

1777 (3.3)

1920 (2.7)

1425 (3.2)

69 (3.3)

Non-Iranian

8112 (3.0)

5554 (96.7)

36,604 (97.4)

31,692 (97.6)

24,459 (96.3)

51,351 (96.7)

68,267 (97.3)

42,582 (96.8)

2003 (96.7)

Sign and symptoms (No.%)

Vomit

9503 (3.5)

296 (5.2)

1553 (4.1)

1420 (4.4)

1150 (4.5)

1626 (3.1)

1933 (2.8)

1464 (3.3)

61 (2.9)

 Diarrhea

8031 (3.0)

264 (4.6)

1471 (3.9)

1208 (3.7)

1006 (4.0)

1387 (2.6)

1637 (2.3)

1025 (2.3)

33 (1.6)

Anorexia

26,038 (9.6)

588 (10.2)

3565 (9.5)

3114 (9.6)

2469 (9.7)

4765 (9.0)

7172 (10.2)

4172 (9.5)

193 (9.3)

Paralysis

276 (0.1)

10 (0.2)

37 (0.1)

47 (0.1)

29 (0.1)

60 (0.1)

55 (0.1)

38 (0.1)

(0.0)

Fever

104,056 (38.5)

2194 (38.2)

13,530 (36.0)

11,428 (35.2)

9914 (39.0)

21,286 (40.1)

27,865 (39.7)

17,124 (38.9)

715 (34.5)

Seizure

760 (0.3)

33 (0.6)

107 (0.3)

105 (0.3)

99 (0.4)

136 (0.3)

155 (0.2)

112 (0.3)

13 (0.6)

Muscular pain

102,184 (37.8)

2147 (37.4)

13,616 (36.2)

11,626 (35.8)

8788 (34.6)

20,097 (37.8)

27,422 (39.1)

17,679 (40.2)

809 (39.0)

Chest pain

7311 (2.7)

198 (3.4)

1412 (3.8)

1015 (3.1)

715 (2.8)

1169 (2.2)

1682 (2.4)

1079 (2.5)

41 (2.0)

Abdominal pain

6559 (2.4)

143 (2.5)

1156 (3.1)

809 (2.5)

637 (2.5)

1165 (2.2)

1700 (2.4)

919 (2.1)

30 (1.4)

Dyspnea

111,113 (41.1)

2678 (46.6)

17,898 (47.6)

14,085 (43.4)

9908 (39.0)

22,007 (41.4)

27,312 (38.9)

16,394 (37.3)

831 (40.1)

Nausea

18,618 (6.9)

480 (8.4)

2630 (7.0)

2136 (6.6)

1819 (7.2)

3427 (6.5)

4991 (7.1)

2998 (6.8)

137 (6.6)

Headache

29,143 (10.8)

516 (9.0)

3825 (10.2)

3464 (10.7)

2460 (9.7)

5830 (11.0)

7839 (11.2)

5004 (11.4)

205 (9.9)

Cough

158,910 (58.7)

2999 (52.2)

20,365 (54.2)

17,764 (54.7)

13,597 (53.5)

31,314 (58.9)

44,401 (63.3)

27,273 (62.0)

1197 (57.8)

Vertigo

8962 (3.3)

185 (3.2)

1372 (3.6)

1177 (3.6)

809 (3.2)

1657 (3.1)

2262 (3.2)

1419 (3.2)

81 (3.9)

Skin lesion

249 (0.1)

6 (0.1)

30 (0.1)

29 (0.1)

21 (0.1)

47 (0.1)

65 (0.1)

48 (0.1)

3 (0.1)

Loss of taste

4841 (1.8)

94 (1.6)

488 (1.3)

409 (1.3)

428 (1.7)

982 (1.8)

1526 (2.2)

890 (2.0)

24 (1.2)

Anosmia

8335 (3.1)

120 (2.1)

753 (2.0)

1024 (3.2)

787 (3.1)

1752 (3.3)

2183 (3.1)

1677 (3.8)

39 (1.9)

Comorbidities (No.%)

Heart disease

18,541 (6.9)

621 (10.8)

3289 (8.7)

3080 (9.5)

2353 (9.3)

3021 (5.7)

3599 (5.1)

2447 (5.6)

131 (6.3)

HIV

90 (0.0)

6 (0.1)

15 (0.0)

16 (0.0)

10 (0.0)

18 (0.0)

18 (0.0)

7 (0.0)

(0.0)

Asthma

1878 (0.7)

59 (1.0)

363 (1.0)

308 (0.9)

225 (0.9)

342 (0.6)

342 (0.5)

230 (0.5)

9 (0.4)

Neurological disease

1251 (0.5)

51 (0.9)

215 (0.6)

211 (0.6)

147 (0.6)

191 (0.4)

226 (0.3)

197 (0.4)

13 (0.6)

Hypertension

26,046 (9.6)

776 (13.5)

4602 (12.2)

4217 (13.0)

3068 (12.1)

4430 (8.3)

5346 (7.6)

3406 (7.7)

201 (9.7)

Hematologic disease

839 (0.3)

26 (0.5)

102 (0.3)

108 (0.3)

101 (0.4)

144 (0.3)

195 (0.3)

153 (0.3)

10 (0.5)

Liver disease

810 (0.3)

29 (0.5)

124 (0.3)

134 (0.4)

108 (0.4)

138 (0.3)

155 (0.2)

119 (0.3)

3 (0.1)

Kidney disease

2475 (0.9)

91 (1.6)

402 (1.1)

401 (1.2)

319 (1.3)

426 (0.8)

494 (0.7)

311 (0.7)

31 (1.5)

Diabetes

22,191 (8.2)

669 (11.6)

3830 (10.2)

3416 (10.5)

2532 (10.0)

3881 (7.3)

4647 (6.6)

3065 (7.0)

151 (7.3)

Other chronic diseases

10,271 (3.8)

315 (5.5)

1594 (4.2)

1629 (5.0)

1272 (5.0)

1780 (3.4)

2075 (3.0)

1519 (3.5)

87 (4.2)

Cancer

2349 (0.9)

70 (1.2)

419 (1.1)

412 (1.3)

313 (1.2)

367 (0.7)

390 (0.6)

360 (0.8)

18 (0.9)

Immunodeficiency

483 (0.2)

18 (0.3)

73 (0.2)

84 (0.3)

44 (0.2)

73 (0.1)

94 (0.1)

91 (0.2)

6 (0.3)

No. of comorbidities (No.%)

0

212,378 (78.5)

3960 (69.0)

27,517 (73.2)

23,300 (71.7)

18,538 (73.0)

43,062 (81.1)

58,267 (83.0)

36,098 (82.0)

1636 (79.0)

1

36,041 (13.3)

1061 (18.5)

6244 (16.6)

5541 (17.1)

4119 (16.2)

6393 (12.0)

7577 (10.8)

4836 (11.0)

270 (13.0)

2

16,405 (6.1)

529 (9.2)

2870 (7.6)

2615 (8.1)

1992 (7.8)

2764 (5.2)

3211 (4.6)

2309 (5.2)

115 (5.6)

3

4932 (1.8)

160 (2.8)

837 (2.2)

879 (2.7)

652 (2.6)

759 (1.4)

964 (1.4)

637 (1.4)

44 (2.1)

≥ 4

868 (0.3)

33 (0.6)

131 (0.3)

148 (0.5)

104 (0.4)

150 (0.3)

168 (0.2)

127 (0.3)

7 (0.3)

Pregnancy (No.%)

No

269,083 (99.4)

5690 (99.1)

37,334 (99.3)

32,295 (99.4)

25,246 (99.4)

52,857 (99.5)

69,840 (99.5)

43,759 (99.4)

2062 (99.5)

Yes

1541 (0.6)

53 (0.9)

265 (0.7)

188 (0.6)

159 (0.6)

271 (0.5)

347 (0.5)

248 (0.6)

10 (0.5)

Smoking (No.%)

No

267,436 (98.8)

5637 (98.2)

37,094 (98.7)

32,051 (98.7)

25,009 (98.4)

52,500 (98.8)

69,541 (99.1)

43,552 (99.0)

2052 (99.0)

Yes

3188 (1.2)

106 (1.8)

505 (1.3)

432 (1.3)

396 (1.6)

628 (1.2)

646 (0.9)

455 (1.0)

20 (1.0)

Drug abuse (No.%)

No

269,342 (99.5)

5692 (99.1)

37,389 (99.4)

32,293 (99.4)

25,203 (99.2)

52,916 (99.6)

69,958 (99.7)

43,828 (99.6)

2063 (99.6)

Yes

1282 (0.5)

51 (0.9)

210 (0.6)

190 (0.6)

202 (0.8)

212 (0.4)

229 (0.3)

179 (0.4)

9 (0.4)

CT Scan (No.%)

Negative

67,715 (25.0)

1638 (28.5)

9767 (26.0)

8468 (26.1)

7645 (30.1)

13,223 (24.9)

16,334 (23.3)

10,102 (23.0)

538 (26.0)

Positive

202,909 (75.0)

4105 (71.5)

27,832 (74.0)

24,015 (73.9)

17,760 (69.9)

39,905 (75.1)

53,853 (76.7)

33,905 (77.0)

1534 (74.0)

Ward

Non-ICU treated

238,575 (88.2)

4480 (78.0)

32,095 (85.4)

28,018 (86.3)

21,572 (84.9)

47,057 (88.6)

64,135 (91.4)

39,372 (89.5)

1846 (89.1)

ICU treated

32,049 (11.8)

1263 (22.0)

5504 (14.6)

4465 (13.7)

3833 (15.1)

6071 (11.4)

6052 (8.6)

4635 (10.5)

226 (10.9)

Death status

Survived

252,001 (93.1)

5174 (90.1)

34,004 (90.4)

30,040 (92.5)

23,883 (94.0)

49,262 (92.7)

65,701 (93.6)

41,880 (95.2)

2057 (99.3)

Deceased

18,623 (6.9)

569 (9.9)

3595 (9.6)

2443 (7.5)

1522 (6.0)

3866 (7.3)

4486 (6.4)

2127 (4.8)

15 (0.7)

Hospitalization days. median (IQR)

5 (2, 7)

5 (2, 7)

5 (2, 7)

5 (3, 7)

5 (2, 7)

5 (2, 7)

5 (2, 7)

4 (2, 6)

1 (1, 1)