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os1 Was a heart-lung machine used?

Definition
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Details
Names (SQL, Symfony)
O_S1_Post_Redo_Hlm, oS1PostRedoHlm
Type / Form Type
boolean / choice_radio
Min. value
0
Max. value
1
Value if unknown
9
Year started
2019
Year ended
3000
Form label
Surgeries with heart-lung machine?
Value encoding
Value Meaning
0 no
1 yes
9 unknown