Hidden stats

Stats that are as important as the default ones but are hidden for gameplay reasons.

The exact values aren't usually shown to the player, but their global effects on the character are displayed when needed (Thirsty, Tired, etc).

Various important stats

Hunger

• Represents your stomach fullness. May indicate your status when malnourished.

Thirst

• Represents your hydration level.

Stored Calories

• Represents calories stored in body fat. Default value (healthy calories) = 55000 kcal

Stamina

• Represents exhaustion due to performing demanding and exhausting tasks like running and fighting.

Fatigue

• Represents accumulated exhaustion and overall tiredness, responsible for feeling sleepy.

Scent

• Represents strength of your smell.

Health

• Represents overall wellness of your character.

Speed

• Determines how many move points you start with each turn.

Stim

• Determines level of stimulants or depressants affecting your character's body.

Pain

• Pain felt by character.

Vitamins

• Various vitamins in the character's body.

Various secondary stats

Radiation

Determines amount of radiation absorbed by your character. High levels will result in radiation sickness. Default value: 0

Cash

• Cash represents your bank account balance from before the Cataclysm.
• It can't be used directly, but you can access your account via ATM machines, and charge a cash card for later use.
• Pre-Cataclysm money is a relic of the past and will not be accepted by many factions. Vending machines don't have that problem, but you need a pre-charged cash card to pay for the goods.
• Default value: random, varying from -20,000$ (debt) to +20,000$ (post 0.D (Danny))
• Some traits may influence starting cash.

Oxygen

• Represents air in your lungs when diving underwater.
• Default value: 30 + 2 * Strength
• Oxygen reserve ticks down every turn unless you have gills, or have oxygenator bionic installed (activates automatically, consumes power), or use air supply from a diving gear.
• When you run out of air you will be prompted to surface or swim to shore. If you won't you will suffer incremental torso damage until you die of suffocation.
• You will breathe air from your scuba tank or small scuba tank if you have them worn and activated. They have auto-regulators so you don't waste air.
• You will breathe air from your rebreather mask. It has to be active and supplied with a proper filter.
• Oxygen tank and its smaller version can't be used for that purpose. This is medical pure oxygen unfit for diving and the bottle doesn't have proper regulator to deliver it underwater.
• Asthma attack underwater depletes your oxygen.
• Shouting underwater depletes your oxygen.

Others

There are many other hidden indicators and variables, but most of them are either displayed by their respective mechanic, or used for purely technical reasons. Examples: recoil, wetness, body temperature, selected martial art, vehicle driver indicator, etc. For that reason they are not being enumerated and explained here.