Four groups within factorial randomised controlled trial
| 2×2 factorial | Securement: SED (control) | Securement: ISD |
| Dressing: no CHG disc (control) | SD+SP, no CHG disc | ISD, no CHG disc |
| Dressing: CHG disc | SD+SP with CHG disc | ISD with CHG disc |
CHG, chlorhexidine gluconate; ISD, integrated securement dressing; SD, securement dressing; SED, securement device; SP, standard polyurethane.