This study examined whether providing messages matched to women's monitor-blunter coping styles is effective in encouraging mammography utilization. Female callers to a cancer information hotline were assessed at the end of their regular telephone call and classified as monitors or blunters. A randomly assigned message promoting mammography utilization, tailored for monitors or blunters, was delivered on the telephone, and a similarly tailored brochure and refrigerator magnet were mailed to participants immediately after their call. Women were telephoned 6 and 12 months later to determine whether they had obtained a mammogram. Messages matched to a woman's monitor-blunter coping style encouraged mammography after 6 months more effectively than mismatched messages and were significantly more effective for blunters but not for monitors.