Table 1.

Reason for failure to deliver the short message service (SMS)

Number of participants	Reason for missing SMS	Examples of reasons
21/34	SMS not sent	■Staff unaware of trial ■Trial paperwork missing from workstation ■Forgotten to send ■Too busy to send
12/34	Input error	■Mobile number not entered ■Tried to use landline telephone number
3/34	Staff decision not to send SMS	■Family recently updated at bedside