Long-term psychosocial consequences of false-positive screening mammography: a cohort study with follow-up of 12-14 years in Denmark.

Objective: To compare the long-term psychosocial consequences of mammography screening among women with breast cancer, normal results and false-positive results.

Design: A matched cohort study with follow-up of 12-14 years.

Setting: Denmark from 2004 to 2019.

Participants: 1170 women who participated in the Danish mammography screening programme in 2004-2005.

Intervention: Mammography screening for women aged 50-69 years.

Outcome Measures: We assessed the psychosocial consequences with the Consequences Of Screening-Breast Cancer, a condition-specific questionnaire that is psychometrically validated and encompasses 14 psychosocial dimensions.

Results: Across all 14 psychosocial outcomes, women with false-positive results averagely reported higher psychosocial consequences compared with women with normal findings. Mean differences were statistically insignificant except for the existential values scale: 0.61 (95% CI (0.15 to 1.06), p=0.009). Additionally, women with false-positive results and women diagnosed with breast cancer were affected in a dose-response manner, where women diagnosed with breast cancer were more affected than women with false-positive results.

Conclusion: Our study suggests that a false-positive mammogram is associated with increased psychosocial consequences 12-14 years after the screening. This study adds to the harms of mammography screening. The findings should be used to inform decision-making among the invited women and political and governmental decisions about mammography screening programmes.