figure of hours of data per record

Unique records (hours of data)
SIRS only: 132 rec (2313 hours)
SevSep only: 399 rec (7189 hours)
SepShock: 148 rec (3722 hours)
These are hours up to three days before onset, but also where the
record actually spans the time of onset. They may have gaps within the
record though.