['To examine the effects of coping and of infertility-specific and nonspecific stress on pregnancy outcomes after IVF treatment.', 'Cross-sectional design controlling for potential confounding variables. Psychosocial measures were assessed on the day of embryo transfer.', 'Fertility clinic in Greece.', 'Three hundred forty-two women.', 'None.', 'A clinically recognized pregnancy or a biochemical pregnancy.', 'Of 342 women participating in the study, 79 became pregnant, representing a success rate of 23.3%. There were no statistically significant differences between women who became pregnant and those who did not in terms of duration of infertility, causes of infertility, previous IVF cycles, and infertility-specific or nonspecific stress. The only factor that was significantly associated with pregnancy outcome was emotionally expressive coping (adjusted odds ratio, 1.272; 95% confidence interval, 1.06-1.52). Women who coped by expressing their emotions were less likely to get pregnant than were women who did not.'] Does emotionally expressive coping reduce pregnancy rates in patients undergoing in vitro fertilization?