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Table 1 Sample characteristics at Time 1 (n = 6000) and Time 2 (n = 3285)

From: Competing with big business: a randomised experiment testing the effects of messages to promote alcohol and sugary drink control policy

  Time 1 (t1)
% (n)
Time 2 (t2)
% (n)
Test statistic
Health policy assignment
 20% tax on sugary drinks 25.0 (1500) 24.9 (819) Χ2(3) = 0.09, p = .992
 Removal of sugary drink sponsorship from sport 25.0 (1500) 25.0 (821)
 Volume-based tax on alcohol 25.0 (1500) 24.8 (815)
 Removal of alcohol sponsorship from sport 25.0 (1500) 25.3 (830)
Message condition
 Control 20.0 (1200) 19.6 (644) Χ2(4) = 0.32,
p = .988
 Standard pro-policy arguments (Standard) 20.0 (1200) 20.3 (667)
 Standard + inoculation 20.0 (1200) 19.9 (655)
 Standard + narrative 20.0 (1200) 20.2 (664)
 Standard + inoculation + narrative 20.0 (1200) 19.9 (655)
Sex
 Male 40.8 (2446) 42.2 (1386) Χ2(1) = 1.78,
p = .182
 Female 59.2 (3554) 57.8 (1899)
Age (years)
 18–24 7.5 (450) 5.9 (193) Χ2(5) = 13.60,
p = .018
 25–34 14.2 (853) 13.4 (441)
 35–44 14.1 (847) 13.6 (448)
 45–54 15.5 (929) 15.3 (504)
 55–64 21.5 (1292) 22.5 (739)
 65 and older 27.2 (1629) 29.2 (960)
SES (area-based) a
 Quintile 1 (high disadvantage) 16.2 (974) 16.4 (539) Χ2(4) = 1.34,
p = .855
 Quintile 2 18.2 (1090) 18.3 (602)
 Quintile 3 19.2 (1151) 18.2 (598)
 Quintile 4 22.4 (1342) 22.6 (743)
 Quintile 5 (low disadvantage) 24.0 (1442) 24.4 (802)
Highest level of education
 Some secondary school or less 12.4 (744) 13.2 (433) Χ2(4) = 1.34,
p = .854
 Finished secondary school 17.6 (1053) 17.7 (582)
 Some tertiary education 26.0 (1561) 25.6 (840)
 Finished tertiary education 29.5 (1768) 29.1 (956)
 Higher degree/diploma 14.6 (874) 14.4 (474)
Parent/carer of child aged under 18
 No 76.4 (4584) 77.7 (2552) Χ2(1) = 1.98,
p = .160
 Yes 23.6 (1416) 22.3 (733)
Body mass index (BMI) category b
 Underweight 2.7 (139) 2.5 (70) Χ2(3) = 0.84,
p = .839
 Healthy weight 37.3 (1926) 38.1 (1079)
 Overweight 32.6 (1682) 32.1 (907)
 Obese 27.5 (1420) 27.3 (773)
Consumed sugary drinks in past 7 days c
 No 48.4 (1453) 50.6 (830) Χ2(1) = 2.01,
p = .156
 Yes 51.6 (1547) 49.4 (810)
Frequency of drinking alcohol in last 12 months d
 Never / non-drinker 16.1 (484) 16.2 (267) Χ2(2) = 0.16,
p = .922
 2–3 days a month or less 40.8 (1225) 41.3 (680)
 At least 1–2 days a week 43.0 (1291) 42.4 (698)
Political ideology (1 = Left to 10 = Right)
 Mean (sd) 5.43 (1.93) 5.44 (1.93) F(1) = 0.09,
p = .767
  1. Note: Percentages are rounded so may not sum to 100%
  2. aSES was determined according to the Australian Bureau of Statistic’s Index of Relative Socio-Economic Disadvantage ranking for Australia using participant’s residential postcode [34]. Data is missing for 1 participant at t1 and t2 who provided an invalid postcode
  3. bBMI was computed using participant’s self-reported height and weight [BMI = weight (kg) / height (m)2] and collapsed into categories according to World Health Organization definitions [35]. BMI information is missing for 833 participants at t1 and 456 participants at t2 as they did not self-report their height and/or weight
  4. cThis question was only asked of participants assigned to a sugary drink policy (t1: n = 3000; t2: n = 1640)
  5. dThis question was only asked of participants assigned to an alcohol policy (t1: n = 3000; t2: n = 1645)