Figure 3. Monthly Incidence of Noninvasive Dental Procedures During 15 Months Before Admission to Hospital With Late Prosthetic Joint Infection (LPJI).

Dotted lines show the linear trend for the case-crossover study control period (months 4-15 before LPJI admission, dashed lines of the same color). The control period trend lines have been extended through the case-period (months 1-3, solid lines of the same color) to allow comparison between the control period trend and any changes in the incidence of dental procedures in the case period.