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Table 2 Blood alcohol concentration (BAC) readings by demographics of survey respondents and time of day (N = 684)

From: Breathalysing and surveying river users in Australia to understand alcohol consumption and attitudes toward drowning risk

  Total Alcohol Yes Alcohol No X2 (p value) comparing alcohol yes to alcohol no X2 comparing BAC < 0.05% to BAC ≥0.05%
  BAC 0.001–0.049% BAC ≥0.050%
  N % N % N % N %
Total 684 100.0 60 8.8 49 7.2 575 84.1
Sex
 Male 331 48.4 25 7.6 27 8.2 279 84.3 0.024 (p = 0.876) 0.952 (p = 0.329)
 Female 353 51.6 35 9.9 22 6.2 296 83.9
Age group
 18–34 years 335 49.0 36 10.7 33 9.9 266 79.4 10.649 (p = 0.001) 7.128 (p = 0.008)
 35–54 years 251 36.7 17 6.8 15 6.0 219 87.3 3.006 (p = 0.083) 0.841 (p = 0.359)
 55+ years 98 14.3 7 7.1 1 1.0 90 91.8 5.158 (p = 0.023) 6.491 (p = 0.006)*
Remoteness classification of respondent’s residential postcode
 Major Cities 123 18.0 10 8.1 0 0.0 113 91.9 7.269 (p = 0.007) 12.124 (p < 0.001)*
 Inner Regional 391 57.2 37 9.5 40 10.2 314 80.3 8.558 (p = 0.003) 10.989 (p = 0.001)
 Outer Regional, Remote and Very Remote 146 21.3 11 7.5 9 6.2 126 86.3 0.872 (p = 0.350) 0.433 (p = 00.511)
 Unknown/International 24 3.5 2 8.3 0 0.0 22 91.7
Country of Birth
 Australia 577 84.4 53 9.2 46 8.0 478 82.8 4.112 (p = 0.043) 3.626 (p = 0.065)*
 Outside Australia 107 15.6 7 6.5 3 2.8 97 90.7
IRSAD classification of respondent’s residential postcode
 Low 118 17.3 13 11.0 16 13.6 89 75.4 5.659 (p = 0.017) 16.462 (p < 0.001)*
 High 113 16.5 14 12.4 0 0.0 99 87.6
 Other/Unknown/International 453 66.2 33 7.3 33 7.3 387 85.4
Time of day
 Morning (6:01 am to 12 pm) 196 28.7 11 5.6 0 0.0 185 94.4 21.855 (p < 0.001) 21.199 (p < 0.001)*
 Afternoon (12:01 pm to 6 pm) 476 69.6 49 10.3 42 8.8 385 80.9 11.831 (p = 0.001) 6.484 (p = 0.011)
 Evening (6:01 pm to 12 am) 12 1.8 0 0.0 7 58.3 5 41.7 16.390 (p < 0.001) 48.088 (p < 0.001)*
  1. Please note: Chi square analysis excludes the other/unknown variables. *p value reported is Fisher’s Exact Test