Surgery Success Chance Factor

Surgery Success Chance Factor is a stat: A multiplier to the chance that a surgery will succeed when performed here. Surgery success chances are also affected by many other factors, including the surgeon's ability and medicine used. Its minimum allowed value is 0%. Its default value is 100%. This stat is applied to beds and other sleep furniture.

• Note that this stat is specific to the base Surgery Success Chance Factor of a given type of sleep furniture.

• When placed in-world, the Surgery Success Chance Factor of a specific item of sleep furniture changes. It is additionally weighted by environmental factors.

In other words, "Surgery Success Chance Factor" is the stat of the bed item and its location.

• For the surgery success stat of a specific colonist, see Medical Surgery Success Chance.
• For the "true" chance of a surgery succeeding, where this factor is one part of the equation, see Surgery.

Formula

When placed in-world, the specific item of Sleep furniture has its Surgery Success Chance Factor stat adjusted based on its environment.

This is calculated as:

Surgery Success Chance Factoritem = (Base stattype + Facility Offset) × Room Cleanliness Multiplier × Light Multiplier × Outdoors Multiplier × Quality Multiplier

Base stat

Every type of sleep furniture's Surgery Success Chance Factor has a base value stat assigned as follows.

Sleep furniture type	Surgery Success Chance Factor
Ancient bed	0.65
Animal bed	1
Animal sleeping box	1
Animal sleeping spot	0.7
Bed	1
Bedroll	1
Double bed	1
Double bedroll	1
Double sleeping spot	0.7
Hospital bed	1.1
Royal bed	1
Slab bed	1
Slab double bed	1
Sleeping spot	0.7

Facility Offset

In addition, facilities placed adjacent to the head of the item of sleep furniture can adjust the stat of the placed item.

The result of these additional factors are displayed under the Facilities heading within the Stats tab of the information page.

Facility Type	Offset
Vitals monitor	+0.05

Room Cleanliness Multiplier

The room cleanliness factor for performing surgery is a determined by the value displayed on the room's cleanliness by the following curve:

Room cleanliness	Room Cleanliness Multiplier	Graph
-5	0.6
0	1
5	1.15

This can be translated into the following formulas:

Range	Formula
Room cleanliness < 0	Room Cleanliness Multiplier = 1 + Room cleanliness × 0.08
Room cleanliness > 0	Room Cleanliness Multiplier = 1 + Room cleanliness × 0.03

The value is limited to a minimum of 0.6 for -5 cleanliness and a theoretical maximum of 1.15 for 5 cleanliness, which is practical limited to 1.018 by the highest available cleanliness of 0.6 of the sterile tile.

If the surgery is performed outside (i.e. not in a room at all), the cleanliness factor is treated as the minimum (0.6).

Light Multiplier

Extremely low levels of light negatively affect the resulting value.

In complete darkness, this can be as little as 0.75. At 50% light level and above, a factor of 1 is applied.

This is referred to as Multiplier for light within the Stats tab of the information page.

Multiplier for Light = 0.75 + Light Level × 0.5

Outdoors Multiplier

If the item of sleep furniture is placed performed outdoors (i.e. there is no room of which the cleanliness may be assessed), an additional multiplier of 0.85 is applied to the resulting chance of surgery success.

Environment Type	Multiplier
Indoors	1
Outdoors	0.85

Quality Factor

A multiplier based on the quality of the specific item is applied. This is referred to as the Quality Multiplier within the Stats tab of the information page.

Quality	Multiplier
Awful	0.9
Poor	0.95
Normal	1
Good	1.05
Excellent	1.1
Masterwork	1.15
Legendary	1.3