AIDS and behavioural risk factors in women in inner city Baltimore: a comparison of telephone and face to face surveys.
OBJECTIVE
The study aimed to investigate the influence the mode of administration of a questionnaire (telephone or face to face) on reports of sexual behaviour and attitudes of HIV risk among woman of reproductive age.


METHODS
Two cross sectional surveys--one, a modified random digit dialing telephone survey, the second, a face to face street sample--were carried out by the same interviewers using similar questionnaires in the same neighbourhoods.


METHODS
Two socially deprived, inner city neighbourhoods of Baltimore City were assessed in early 1990 before a community health intervention was carried out in one of them. Women between 17 and 35 years were surveyed.


RESULTS
Altogether 775 and 416 women in the target age group were interviewed by telephone and face to face methods: the response rates were 66.4% and 77% respectively. Telephone respondents tended to be older, had more education, were more often married, were less likely to live in subsidised housing, and were more likely to report HIV testing. The proportions of respondents who reported a previous abortion and had had a surgical sterilisation were higher among the telephone respondents (34.7% v 24.1% and 26.4% v 20.6%, respectively). With regard to sexual risk behaviour, the only statistically significant differences were found in the proportion who reported having used drugs (10.6% of the face to face v 2.4% of the telephone sample) or alcohol (30.5% v 16.3%) at last sexual intercourse. The observed method effect on these variables remained unchanged after adjusting for age, education, employment, and marital status. This effect was even stronger for a subgroup of face to face respondents who reported not having a telephone at home. The adjusted odds ratios for reporting alcohol consumption and use of drugs at the last sexual encounter in this group compared with the telephone respondents were 3.7 (2.1, 6.6) and 14.1 (5.7, 34.5) respectively.


CONCLUSIONS
Despite the socioeconomic bias associated with the mode of data collection, there are only a few differences between the telephone and personal survey methods in reports of sexual behaviour. These differences are mostly concentrated in young women (under 20 years), and in a particularly socioeconomically deprived subgroup identified through telephone ownership.
Nebot
M
M
Division of Behavioural Sciences and Health Education, Johns Hopkins School of Hygiene and Public Health, Baltimore, MD.
Celentano
D D
DD
Burwell
L
L
Davis
A
A
Davis
M
M
Polacsek
M
M
Santelli
J
J
D000163:Acquired Immunodeficiency Syndrome / Q000523:psychology*; D000293:Adolescent; D000328:Adult; D000367:Age Factors; D001294:Attitude to Health; D015142:Baltimore; D003267:Contraception / Q000706:statistics & numerical data; D003430:Cross-Sectional Studies; D003710:Demography; D005260:Female; D006801:Humans; D007407:Interviews as Topic / Q000379:methods*; D011897:Random Allocation; D018570:Risk Assessment; D012307:Risk Factors; D012725:Sexual Behavior; D011795:Surveys and Questionnaires; D013689:Telephone; D014504:Urban Health