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Table 1 Demographic comparison of survey respondents and residents of the City of Hamilton, Ontario

From: Public perceptions of drinking water: a postal survey of residents with private water supplies

  Census Population # (%) Study Population # (%) p-value (overall test)
Sex
Male 239 520 (49) 124 (52) 0.36
Female 250 750 (51) 115 (48)  
Age (years)
20–29 * 62 650 (17) 9 (4) <0.0001
30–39 74 830 (21) 25 (11)  
40–49 76 890 (21) 60 (25)  
50–59 57 185 (16) 63 (26)  
60–69 40 135 (11) 50 (21)  
70 and older 50 885 (14) 32 (13)  
Education
Less than grade 9 36 915 (12) 12 (5) <0.0001
Grade 9–13, no high school diploma 70 465 (23) 44 (19)  
Grade 9–13, high school diploma 51 455 (16) 56 (24)  
College or trade school diploma 101 395 (33) 71 (30)  
University, graduate or professional degree 50 930 (16) 53 (22)  
Total household income
<$10 000 12 575 (7) 2 (1) <0.0001
>$10 000 to <$20 000 25 240 (13) 8 (4)  
>$20 000 to <$30 000 21 035 (11) 16 (8)  
>$30 000 to <$40 000 20 490 (11) 24 (13)  
>$40 000 to <$50 000 18 195 (10) 15 (8)  
>$50 000 to <$60 000 16 720 (9) 18 (10)  
>$60 000 to <$70 000 15 585 (8) 18 (9)  
>$70 000 58 310 (31) 89 (47)  
Mean number of people in household 2.6 3.0 --
  1. Count in that subcategory was significantly different (χ2>3.84, p < 0.05) between survey and census population
  2. * Age range of comparison groups differ; census: 20–29 years versus sample: 18–29 years