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Table 2 Socio-demographic characteristics of the respondents from first and second online surveys

From: Co-creating a local environmental epidemiology study: the case of citizen science for investigating air pollution and related health risks in Barcelona, Spain

Characteristics

Survey I (n = 488)a

Survey II (n = 560)

n

%

n

%

Age groups

 Less than 18

1

0.36

11

1.98

 18-27

24

8.63

82

14.75

 28-37

83

29.86

163

29.32

 38-47

96

34.53

157

28.24

 48-64

60

21.58

126

22.66

 More than 64

14

5.05

17

3.06

Total

278

100

556

100

District

 Eixample

153

31.35

148

26.62

 Gràcia

71

14.55

95

17.09

 Sant Martí

69

14.14

68

12.23

 Sants-Montjuïc

52

10.66

59

10.61

 Ciutat Vella

36

7.38

39

7.01

 Horta-Guinardo

35

7.17

39

7.01

 Sarrià Sant-Gervasi

28

5.74

51

9.17

 Sant Andreu

17

3.48

23

4.14

 Nou Barris

15

3.07

22

3.96

 Les Corts

9

1.84

10

1.80

 District N/A

3

0.61

2

0.36

Total

488

100

556

100

  1. aA total of 210 (43%) respondents did not answer the question