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Table 1 Unweighted descriptive statistics of mobile and landline samples and mobile-only subsample

From: Surveying alcohol and other drug use through telephone sampling: a comparison of landline and mobile phone samples

  Mobile sample Landline sample Mobile-only subsample Combined sample (dual-frame) Population estimate (census data)
N (unweighted) 1002 1012 295 2014  
Gender      
Male 52% (49%-55%)* 37% (34%-40%) 57% (51%-63%)* 56% (53%-58%) 49%
Age group      
18-24 20% (18%-23%)* 3% (2%-5%) 23% (18%-28%)* 12% (10%-13%) 12%
25-39 33% (30%-36%)* 15% (13%-18%) 48% (42%-54%)* 24% (22%-26%) 27%
40-49 16% (14%-18%) 18% (16%-21%) 9% (6%-12%)* 17% (15%-19%) 18%
50-64 24% (21%-26%)* 31% (28%-34%) 16% (11%-20%)* 28% (26%-30%) 24%
65+ 7% (5%-9%)* 32% (29%-34%) 4% (2%-7%)* 19% (18%-21%) 18%
Region      
Metro 72% (69%-74%)* 64% (61%-67%) 70% (65%-75%) 68% (66%-70%) 68%
Education level      
< year 10 5% (4%-7%)* 11% (9%-13%) 6% (3%-8%)* 8% (7%-9%)  
Year 10 13% (11%-15%)* 19% (17%-22%) 14% (10%-18%) 16% (15%-18%)  
Completed high school 21% (19%-24%)* 17% (15%-19%) 18% (14%-23%) 19% (17%-21%)  
Trade qualification/diploma 24% (22%-27%) 24% (22%-27%) 31% (25%-36%) 24% (23%-26%)  
Degree or higher 35% (33%-38%)* 28% (26%-31%) 31% (26%-36%) 32% (30%-34%)  
Outcome variables      
Current drinker (last 12 months) 83% (80%-85%) 82% (80%-84%) 79% (75%-84%)   
Total alcohol volume estimate (standard drinks) 317 (286-349) 279 (248-311) 357 (298-416)   
Risky drinking (5+std drinks) 57% (54%-60%)* 41% (38%-44%) 60% (55% - 66%)*   
Very-risky drinking (11+ std drinks) 30% (27%-33%)* 16% (13%-18%) 36% (30%-41%)*   
Recent cannabis use 12% (10%-13%)* 3% (2%-5%) 17% (13%-22%)*   
Lifetime cannabis use 41% (38%-44%)* 29% (26%-31%) 49% (44%-55%)*   
Current smoker 23% (21%-26%)* 14% (12%-16%) 34% (28%-39%)*   
  1. * Significantly different from the landline sample (based on survey-derived 95% confidence intervals).