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From the British Medical Journal:
BMJ 2023; 383 doi: https://doi.org/10.1136/bmj-2023-077437 (Published 20 December 2023) Cite this as: BMJ 2023;383:e077437
Abstract
Objective To estimate the increase in sales of emergency contraception following the New Year’s Eve/New Year’s Day holiday.Design Time series analysis using autoregressive integrated moving average (ARIMA) model.
Setting Traditional (that is, “bricks and mortar”) retail outlets—grocery stores, drug stores, mass merchandisers, club stores, dollar stores, and military outlets—in the United States from 2016 to 2022.
Data source Marketing data on weekly aggregated sales of items classified as emergency contraception gathered between 2016 and 2022 (n=362). On the basis of dates, weeks were classified as following the New Year holiday (n=6) or not (n=356).
Main outcome measure Weekly sales of levonorgestrel emergency contraception per 1000 women of reproductive age in the US population.
Results Sales of levonorgestrel emergency contraception significantly increased after the New Year holiday (0.63 (95% confidence interval 0.58 to 0.69) unit increase per 1000 women aged 15-44). Holidays that share some aspects of the elevated risks of unprotected sexual intercourse with the New Year holiday (Valentine’s Day, St Patrick’s Day, US Independence Day) were associated with increased sales, albeit to a lesser degree, with respective sales increases per 1000 women aged 15-44 of 0.31 (0.25 to 0.38), 0.14 (0.06 to 0.23), and 0.20 (0.11 to 0.29). Holidays without these expectations (Easter, Mother’s Day, Father’s Day) were not significantly associated with sales of levonorgestrel emergency contraception....
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