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National Dental Telephone Interview Survey 2010

Identifying and definitional attributes

Metadata item type:Help on this termQuality Statement
METeOR identifier:Help on this term519645
Registration status:Help on this termAIHW Data Quality Statements, Endorsed 30/05/2013

Data quality

Quality statement summary:Help on this term

The National Dental Telephone Interview Survey (NDTIS) is a random sample survey that collects information on the dental health and use of dental services of Australians in all states and territories. The survey includes Australians aged 2 years and over.

  • The NDTIS is a source of nationally representative population data on dental health and use of dental services in Australia.
  • NDTIS is a sample based survey using telephone interview methodology.
  • Children aged 2–4 years were excluded from service usage rates for some services.
  • Persons with no natural teeth were excluded from service usage rates.
  • As with all survey data, these data are subject to sampling error and non-response bias.
  • NDTIS consists of several modules covering specific aspects of oral health status, social and demographic information, and dental visiting behaviours. In 2010 modules were added to capture data for young children (2–4 years) and the use of Teen Dental Plan vouchers.
Institutional environment:Help on this term

The Australian Institute of Health and Welfare (AIHW) is a major national agency set up by the Australian Government under the Australian Institute of Health and Welfare Act 1987 to provide reliable, regular and relevant information and statistics on Australia's health and welfare. It is an independent statutory authority established in 1987, governed by a management Board, and accountable to the Australian Parliament through the Health and Ageing portfolio.

The AIHW aims to improve the health and wellbeing of Australians through better health and welfare information and statistics. It collects and reports information on a wide range of topics and issues, ranging from health and welfare expenditure, hospitals, disease and injury, and mental health, to ageing, homelessness, disability and child protection.

The Institute also plays a role in developing and maintaining national metadata standards. This work contributes to improving the quality and consistency of national health and welfare statistics. The Institute works closely with governments and non-government organisations to achieve greater adherence to these standards in administrative data collections to promote national consistency and comparability of data and reporting.

One of the main functions of the AIHW is to work with the states and territories to improve the quality of administrative data and, where possible, to compile national datasets based on data from each jurisdiction, to analyse these datasets and disseminate information and statistics.

The Australian Institute of Health and Welfare Act 1987, in conjunction with compliance to the Privacy Act 1988 (Cth), ensures that the data collections managed by the AIHW are kept securely and under the strictest conditions with respect to privacy and confidentiality.

For further information see the AIHW website www.aihw.gov.au.

The NDTIS is conducted on behalf of AIHW by the Dental Statistics and Research Unit (DSRU) located at the University of Adelaide, a collaborating unit of the AIHW. In this capacity the DSRU is subject to the provisions of the AIHW Act and the Privacy Act.

Timeliness:Help on this termNDTIS 2010 was conducted between July 2010 and February 2011. The reference period was July 2009 to February 2011. Data from this collection were first published in December 2011 as an online publication (AIHW 2011. Oral health and dental care in Australia: key facts and figures 2011. Cat. no. DEN 214. Canberra: AIHW, available at http://www.aihw.gov.au/publication-detail/?id=10737420710 ).
Accessibility:Help on this termThe DSRU produces a number of statistical reports based on the NDTIS, available free of charge from its website: http://www.arcpoh.adelaide.edu.au/publications/report/statistics/
Or from AIHW:
http://www.aihw.gov.au/dental-and-oral-health/
Customised tables are available on request (on a fee for service basis). Queries should be directed to dsru@adelaide.edu.au.
Interpretability:Help on this termNDTIS consists of several modules: dentate status, perceived need, access to services, rural access, treatment in the last 12 months, cardholder/waiting time, visiting behaviour, social impact, financial impact, dental insurance, chronic disease, societal impact, sociodemographics, edentulous. In 2010 the following modules were included: young child (2–4 years), Use of Teen Dental Plan vouchers.
Relevance:Help on this term

The NDTIS is a random sample survey that collects information on the dental health and use of dental services of Australians in all states and territories. The scope of the survey includes both public and private dental services, and emergency as well as general visits (i.e. check ups and consultations for problems not classified as emergencies).

The survey data are limited to people aged 2 years and over, whose telephone number was listed in the electronic White Pages. Information about oral health services provided to edentulous persons (i.e. people with no remaining natural teeth) is not included. As NDTIS does not specifically identify dental services provided through hospitals, or services provided for orthodontic reasons, it was not possible to exclude these services from usage rates.

The target sample size for the 2010 NDTIS was 6,600 adults aged 18 years or older, 400 children aged 2–4 years and 3,000 children aged 5–17 years. The number of survey participants after data editing was completed is provided in Table 1.

Age group

Sample size

2–4 year olds

418

5–17 year olds

3,054

18–24 year olds

649

25–44 year olds

2,104

45–64 year olds

2,908

65+ year olds

1,104

Total

10,237

Accuracy:Help on this term

Data were collected from a random sample of Australians selected using a two-stage stratified sample design.

Testing of the NDTIS questionnaire program was conducted over May and June 2010. There were three phases to the testing, which involved informal in-house testing, cognitive interviews and a pilot test. Indigenous status is recorded, however small numbers of respondents identify as Indigenous and only national estimates are made on Indigenous status.

An overall participation rate of 47.8% was achieved in the 2010 survey. A total of 20,343 unique telephone numbers were called resulting in 7,869 households with one or more completed interviews. Participation rates ranged from 41.9% in Sydney through to 59.8% in non-metropolitan South Australia. 

Stratum

Total sampled

Out of scope

Out of scope no child in household

Non-contact

Refusal

Participating households

Per cent participation

Sydney

2,780

191

395

335

939

920

41.9%

Balance of New South Wales

1,717

97

180

165

562

713

49.5%

Melbourne

2,907

182

456

302

1,003

964

42.5%

Balance of Victoria

1,317

62

234

123

404

494

48.4%

Brisbane

1,218

80

32

137

423

546

49.4%

Balance of Queensland

1,309

87

11

156

476

579

47.8%

Adelaide

1,450

99

275

147

367

562

52.2%

Balance of South Australia

574

26

16

51

163

318

59.8%

Perth

1,982

139

440

178

589

636

45.3%

Balance of Western Australia

633

37

0

79

205

312

52.3%

Hobart

814

38

145

80

207

344

54.5%

Tasmania

807

45

86

78

249

349

51.6%

Australian Capital Territory

1,304

72

220

125

340

547

54.1%

Darwin

852

102

56

106

272

316

45.5%

Northern Territory

679

64

23

112

211

269

45.4%

Total

20,343

1,321

2,569

2,174

6,410

7,869

47.8%

As with all survey data, these data are subject to sampling error and non-response bias. Data are weighted and the magnitude of sampling error is indicated by 95% confidence intervals included with all published estimates.

Interviews were rendered invalid if they were missing the demographic data which were necessary for them to be weighted by the probability of selection. These requirements were the sex, age and dwelling type of the respondent, and the number of persons in the same household who may have been selected instead of the respondent. Due to incomplete data, 31 records (0.3%) were excluded from the final dataset.

For those records which were able to be weighted there were very few missing data items. Consequently, all weighted records generated useable data for analysis.

Detailed description of survey methodology can be found in Appendix A of the Insurance and use of dental services (NDTIS 2010) publication at http://www.aihw.gov.au/WorkArea/DownloadAsset.aspx?id=10737421951

Coherence:Help on this termThe NDTIS has been conducted regularly since 1994. While some changes have been made to the questionnaire and methodology over time, the data items used to derive most estimates have been consistent over time. In 2010 the sample of children aged 5–17 years was increased and children aged 2–4 added for the first time. Specific questions asked in each NDTIS are listed in appendices to the technical reports for each survey. These technical reports are available at http://www.arcpoh.adelaide.edu.au/publications/report/statistics/

Data products

Implementation start date:Help on this term29/04/2013
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