What is the chance of a Sacrifice Room to appear on a floor?

I'd like to know the probabability of a Sacrifice Room to appear on a floor. For me it feels like 33% or 50%. Does someone have more reliable data?

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Are sacrifice rooms on every floor?

Sacrifice rooms are per floor. If you're trying to get anything specific from sacrifice rooms, try to stockpile hearts on the ground of the floor before attempting, or some other form of healing.

Can sacrifice rooms spawn?

Sacrifice rooms are more likely to be spawned if the player has full HP (Soul hearts will add up as well).

Can a Sacrifice room appear in the chest?

Can the Sacrifice Room be in the void? The wiki only states that they can't appear in the Chest or Dark Room, but nothing about Void. Nope. Afaik all special rooms in Void are boss rooms.

Do sacrifice rooms take soul hearts first?

The Spike takes Soul Hearts first.

PLAY SACRIFICE ROOMS FOR BETTER RUNS! - The Binding Of Isaac: Repentance #145

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