Center 1 Time (min) to Antibiotic Administration SPC Chart. Center 1 Time (min) to Antibiotic Administration SPC Chart. Letters represent interventions A) 1, 2, 3 B) 3, 5, 6, 7, 8, 9, 12, 13, 15 (see intervention detail Table 1). Double arrow indicates statistical transition point for intervention group analysis. Sandra Spencer et al. BMJ Qual Improv Report 2017;6:u212406.w4933 © 2017, Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/