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Table 1 Demographic characteristics of the interviewees (n = 1604)

From: Knowledge and perceptions of air pollution in Ningbo, China

Characteristics Frequency (n) Percentage (%) Frequency of awareness (n) Awareness rate (%) χ 2 P value
Districts       
 Jiangbei Districts 852 53.11 599 70.31 25.96 <0.0001
 Ninghai County 752 46.89 437 58.11
Gender
 Male 651 40.59 413 63.44 0.63 0.4270
 Female 953 59.41 623 65.37   
Age (years)
 14- 478 29.80 362 75.73 111.33 <.0001
 30- 411 25.62 297 72.26
 40- 249 15.52 165 66.27
 50- 271 16.90 121 44.65
  ≥ 60 195 12.16 91 46.67
Education
  ≥ College 755 47.07 561 74.30 100.78 <.0001
 High school 355 22.13 242 68.17
 Junior high school 313 19.51 155 49.52
  ≤ Elementary school 181 11.28 78 43.09
Occupation
 Manual worker 141 8.79 78 55.32 128.72 <.0001
 Homemaker and retired 350 21.82 147 42.00
 Student 182 11.35 149 81.87
 Cadre and technician 583 36.35 426 73.07
 Service 287 17.89 199 69.34
 Unemployed 61 3.80 37 60.66