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Table 3 Design effects and design effect ratios of list assisted random digit dialling sample and electronic white pages sample in the New South Wales Population Health Survey in 2003 on 23 health related indicators for adults aged 16 years or older.

From: Does sampling using random digit dialling really cost more than sampling from telephone directories: Debunking the myths

Indicators LA-RDD Design effect EWP Design effect Ratio of design effect
Health Behaviour
Any alcohol risk drinking 2.07 2.48 1.20
High alcohol risk drinking 2.19 2.70 1.23*
Hand washing when handling raw meat 2.04 2.46 1.21
Food insecurity in the last 12 months 1.94 2.50 1.29
Recommended daily fruit intake 2.06 2.45 1.19
Usual use of low fat, reduced fat or skim milk 2.03 2.41 1.19
Adequate physical activity 2.09 2.50 1.19
Use of public water as usual source of water 1.71 1.97 1.15
Current daily or occasional smoking 2.20 2.76 1.25*
Smoke free household 1.93 2.23 1.15
Recommended daily vegetable intake 1.80 2.00 1.11
Health Status
Ever diagnosed with asthma 2.09 2.40 1.15
Current asthma 2.05 2.26 1.10
Overweight or obesity 2.05 2.43 1.18
Diabetes or high blood sugar 1.54 1.48 0.96
Self-rated health status as excellent, very good or good 1.88 2.20 1.17
High or very high psychological distress 1.96 2.60 1.32*
Health Services
Emergency department care rated as excellent, very good or good. 2.36 2.77 1.17
Difficulties getting health care when needing it 1.64 1.86 1.13
Over night hospital care in the previous 12 months rated as excellent, very good or good. 2.04 2.75 1.35*
Social Capital
Attended at least one community event in the previous six months 2.05 2.46 1.20
Trust most people 2.05 2.52 1.23*
Visit neighbours 2.13 2.51 1.18
Average design effects and ratio of average design effects 2.00 2.38 1.19
  1. *top five design effect ratios
  2. Source: New South Wales Health Survey Program, Centre for Epidemiology and Research, New South Wales Department of Health.