We evaluated factors associated with the regular use of screening mammography among women presenting for screening. Six thousand two hundred forty-four women ages 55 and older who participated in the 1991-1992 Texas Breast Screening Project were classified as regular or irregular users of mammography according to self-reported mammographic history since 1986. Logistic regression was applied to determine odds ratios of specified factors. Fourteen % were regular users of mammographic screening. Being older, black or Hispanic, receiving regular care from a family doctor, believing in a lower prospect of cure of breast cancer, and lacking health insurance coverage were associated with less regular use of screening mammography. Higher educational level, family history of breast cancer, prior breast biopsy, annual income > or = +35,000, receiving regular care from a gynecologist, believing that life would be difficult with breast cancer, and believing in a greater personal risk for breast cancer were associated with a greater likelihood of regular use (P < 0.01). Among multiple factors associated with regular use of screening mammography, sociodemographic variables associated with regular mammography use are similar to those influencing initial use of screening mammography. Women who are difficult to persuade to obtain mammographic screening may be equally difficult to persuade to adhere to regular use.