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The increase in mobile telephoneonly households may be a source of bias for traditional landline gambling prevalence surveys. Aims were to: (1) identify Australian gambling participation and problem gambling prevalence using a dualframe (50% landline and 50% mobile telephone) computerassisted telephone interviewing methodology; (2) explore the predictors of sample frame and telephone status; and (3) explore the degree to which sample frame and telephone status moderate the relationships between respondent characteristics and problem gambling.

A total of 2000 adult respondents residing in Australia were interviewed from March to April 2013.

Participation in multiple gambling activities and Problem Gambling Severity Index (PGSI).

Estimates were: gambling participation [63.9%, 95% confidence interval (CI …