Thirty-day rate of infection-related hospital admissions in regular IgRT users according to IgRT in the previous month. Smoothed hazard infection rates with 95% CI from first IgRT in regular IgRT users. The pink line indicates the infection rate per person-month in periods of IgRT use (on-IgRT), and the blue line indicates the infection rate per person-month in periods without IgRT use (off-IgRT), conditional on survival.