Patient safety measures as used: 

['Foreign Body Left In', 

'OB Trauma: Instrument',
'OB Trauma: No Instrument', 

'Post-Op PE: Hip and Knee',
'Post-Op Sepsis: Abdominal']

Dataset: from CIHI, Canada (Open and public data). Data for 2014-2015

Units for measurements for the indicators:

['Crude rate per 100,000 hospital discharges',
'Crude rate per 100 non c-section deliveries with instrument',
'Crude rate per 100 non c-section deliveries without instrument',
'Crude rate per 100,000 hip or knee replacement surgery discharges',
'Crude rate per 100,000 abdominal surgery discharges']

However, for the plot/Heatmap the values are normalized; hence, units can be ignored. Values are for relative comparisons.