Graphical depiction highlighting the seasonal variation in number of predicted 24-hour shifts to achieve 10 trauma/general surgery urgent cases with 95% level of confidence. Graphical depiction highlighting the seasonal variation in number of predicted 24-hour shifts to achieve 10 trauma/general surgery urgent cases with 95% level of confidence. Andrew Hall et al. Trauma Surg Acute Care Open 2019;4:e000274 © Author(s) (or their employer(s)) 2019. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.