Table 1 Characteristics of the cohort overall and according to COVID-19 outcomes

From: Long-term exposure to air pollution and severe COVID-19 in Catalonia: a population-based cohort study

 

Overall

COVID-19 hospital admission

COVID-19 ICU admission

COVID-19 death

n

4,660,502

47,174

4699

10,001

Age, years, mean (SD)

53.6 (17)

65.7 (17)

63.3 (12)

81.7 (10)

Female, n (%)

2,446,855 (52.5)

22,288 (47.2)

1508 (32.1)

5149 (51.5)

Tobacco smoking, n (%)

Non-smoker

3,033,731 (65.1)

31,911 (67.6)

2878 (61.2)

6943 (69.4)

Former smoker

680,895 (14.6)

10,057 (21.3)

1242 (26.4)

2254 (22.5)

Active smoker

945,876 (20.3)

5206 (11.0)

579 (12.3)

804 (8.0)

Individual income group, n (%)

Low

3,240,314 (69.5)

34,119 (72.3)

3229 (68.7)

7909 (79.1)

Middle

1,393,153 (29.9)

12,826 (27.2)

1441 (30.7)

2055 (20.5)

High

27,035 (0.6)

229 (0.5)

29 (0.6)

37 (0.4)

Health risk group, n (%)

Healthy

2,334,035 (50.1)

11,681 (24.8)

1250 (26.6)

567 (5.7)

Low

1,394,963 (29.9)

13,601 (28.8)

1563 (33.3)

1903 (19.0)

Moderate

698,598 (15.0)

13,133 (27.8)

1252 (26.6)

3838 (38.4)

High

232,906 (5.0)

8759 (18.6)

634 (13.5)

3693 (36.9)

Chronic comorbidities, n (%)

Diabetes mellitus

471,419 (10.1)

11,959 (25.4)

1350 (28.7)

3731 (37.3)

Obesity

1,160,099 (24.9)

19,701 (41.8)

2341 (49.8)

3927 (39.3)

COPD

223,500 (4.8)

6128 (13.0)

557 (11.9)

2116 (21.2)

Hypertension

1,181,252 (25.3)

22,578 (47.9)

2229 (47.4)

6839 (68.4)

Other cardiovascular disorders

364,787 (7.8)

9538 (20.2)

785 (16.7)

3662 (36.6)

Dyslipidemia

1,305,896 (28.0)

20,539 (43.5)

2209 (47.0)

5119 (51.2)

Nursing home status

-

4433 (9.4)

128 (2.7)

2933 (29.3)

Area of residence indicators

Urbanicity, n (%)

City

2,893,786 (62.1)

33,434 (70.9)

3287 (70.0)

6630 (66.3)

Town and suburb

1,360,492 (29.2)

11,021 (23.4)

1122 (23.9)

2740 (27.4)

Rural

406,224 (8.7)

2719 (5.8)

290 (6.2)

631 (6.3)

Socioeconomic indexes

Small area socioeconomic index, median [IQR]

41.05 [32.20, 49.45]

41.71 [32.69, 50.90]

42.32 [33.72, 51.26]

40.78 [32.16, 49.50]

Deprivation index, z-score, median [IQR]

−0.54 [−1.04, −0.04]

−0.52 [−1.03, 0.02]

−0.45 [−0.98, 0.09]

−0.60 [−1.09, −0.06]

Percentage of non-Spanish residents, %, median [IQR]

11.8 [7.0, 18.2]

12.5 [7.6, 19.3]

13.2 [8.0, 20.4]

12.0 [7.3, 18.2]

Gini index, median [IQR]

29.5 [27.2, 32.3]

29.6 [27.2, 32.2]

29.6 [27.3, 32.2]

29.7 [27.3, 32.4]

Health access

Distance to closest primary care unit, meters, median [IQR]

422 [262, 644]

409 [258, 600]

397 [252, 587]

422 [264, 632]

Average weekly TPP, %, median [IQR]

9.16 [7.95, 10.01]

9.19 [8.09, 10.01]

9.19 [8.09, 10.14]

9.16 [8.09, 10.14]

  1. Higher values of the small area socioeconomic index denote a worse socioeconomic position compared to the average of Catalonia; higher values of the deprivation index denote more deprivation Compared with the average of Spain.
  2. COPD chronic obstructive pulmonary disease, TPP test-positive proportion.