How incriminating was the chart showing Lucy Letby was present at all 25 baby 'crashes'

This is an excerpt from an interview Norman Fenton conducted with Scott McLachlan on 2 July 2024. Here they discuss the chart presented by the prosecution in the first Lucy Letby trial that showed Lucy was present during all 25 'crashes' of babies over the period where she was suspected of causing harm. This chart clearly had a powerful impact on the jury, but how unusual was it to observe a sequence of events like this where the same nurse was present? See for the full interview