Table 3 Progression criteria (published in protocol paper [17])
GREEN; proceed to definitive study—GO | AMBER; consider protocol amendments to improve criteria | RED; do not proceed to main trial—STOP |
|---|---|---|
 ≥ 70% of callers with smartphones agreeing and able to activate video livestreaming |  ≥ 50% of callers with smartphones agreeing and able to activate video livestreaming |  < 50% of callers with smartphones agreeing and able to activate video livestreaming |
 ≥ 50% of requests to activate video livestreaming resulting in footage being viewed |  ≥ 30% but < 50% of requests to activate video livestreaming resulting in footage being viewed |  < 30% of requests to activate video livestreaming resulting in footage being viewed |
Air Ambulance (HEMS) stand-down rate reducing by ≥ 10% and/or change in dispatch decision as a result of live streamed footage confirmed as being appropriate in ≥ 10% cases | Air Ambulance stand-down rate reducing by ≥ 5% and/or change in dispatch decision as a result of live streamed footage confirmed as being appropriate in ≥ 5% cases | No change in Air Ambulance stand-down rate and/or change in dispatch decision as a result of live streamed footage |
Rates of psychological harm (based on the survey measures) not significantly greater in 999 callers using video livestreaming compared to those not; and no significant difference in change to psychological harm over time in staff (CCPs, HEMS dispatchers, Research Paramedics) compared to change in staff in a comparison EOC not using video livestreaming/streamed from scene footage | – | Evidence of significantly greater harm in either 999 callers or EOC staff using video livestreaming compared to EOC not using video livestreaming |