family planning clinics, only 27% of respondents knew that chlamydia could cause infertility, 3 although around 40% of female respondents at genito-urinary medicine clinics were aware of this complication.4,5 A survey at US sexually transmissible disease (STD) clinics revealed a high rate of misconceptions about STD-protective behaviours such as genital washing and douching. 6 In Australia, a nationally representative sample of 3,550 Australian secondary school students revealed that although knowledge about HIV was good, knowledge about STIs other than HIV was poor.7 Although 56% of students knew that people who had injected drugs were at risk of contracting hepatitis C, only 37% were aware that hepatitis C could be spread by tattooing or body piercing. Fewer than half the respondents correctly answered questions about the transmission and effects of chlamydia, herpes, gonorrhoea, hepatitis B and hepatitis C, and 31% believed there was a vaccine against hepatitis C.8 A national non-random dial-in telephone survey of homosexually active men reported generally better levels of knowledge of STIs: 82% of respondents knew that genital herpes persisted for life, 77% knew that hepatitis B could be transmitted sexually, 72% believed that hepatitis C had long-term health effects, 71% knew that gonorrhoea could be transmitted through oral sex, 67% knew that hepatitis C could be transmitted by tattooing and body piercing, and 52% knew it was untrue that genital warts could be spread only by intercourse.
9One aim of the Australian Study of Health and Relationships (ASHR) was to assess levels of knowledge regarding STIs and blood-borne viruses (BBVs).
MethodsThe methodology used in the ASHR is described elsewhere in this issue of the Journal.10 Briefly, between May 2001 and June 2002 computer-assisted telephone interviews were completed by a representative sample of 10,173 men and 9,134 women aged 16-59 years from all States and Territories, who were selected by modified random-digit dialling. The overall response rate was 73.1% (69.4% among men, and 77.6% among women).Respondents completed a 10-item test of knowledge about STIs and BBVs by indicating whether they thought each of the items listed in Table 1 was true or false, or did not know the answer. Correct responses were summed to give a knowledge score that could vary from 0 to 10. Comparisons with other samples were possible, because all 10 items had been used in the national survey of secondary students 7 and six had been used in a national survey of homosexually active men.
9The correlates of STI and BBV knowledge examined in this paper included respondents' age recoded into five groups: 16-19, 20-29, 30-39, 40-49 and 50-59 years. Respondents who spoke a language other than English at home were classified as having a non-English-speaking background. Sexual identity (in answer to the question 'Do you think of yourself as ...') was coded as heterosexual (or 'straight'), homosexual (lesbian or gay) or bisexual. Too few respondents stated that they were 'queer', 'oth...