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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