LAUSR

Objective The Covid-19 pandemic created a backlog of women awaiting an invitation for breast screening in the UK. To recover in a timely fashion, the National Health Service programme opted to issue open invitations (OI) to women rather than the standard pre-booked timed appointments (TA). Historically, OIs have been shown to result in lower uptake. The aim of this study was to make use of a natural experiment to compare uptake in groups sent an OI with those sent a TA during a period when both invitation methods were in use. Methods Women invited for routine screening at one of the six London breast screening services from September 2020 to March 2021 were included and grouped according to the type of invitation they had received (TA or OI). The outcome was attendance within 6 months of opening the screening episode. Data were analysed by logistic regression. Results During the period of the study, 78,192 (32.5%) women received a TA and 162,680 (67.5%) received an OI. In the TA group, 47,391 (60.6%) attended within six months of offered appointment and in the OI group 86,430 (53.1%) attended. This difference was significant (p < 0.001). The odds ratio (95% CI) for the attended outcome was 1.44 (1.33–1.55) adjusted for differences in deprivation and for invitation category (first invitation or subsequent invitation). Conclusions This study supports the view that TA delivers a higher uptake than OI. It suggests that during this period over 12,000 women in London, who would have been expected to attend if given the standard TA, did not attend their appointment having received an OI.