Status Effect List (hopefully complete now):
Dazed = Reduced Damage
Staggered = Reduced Resistance
Off-Balance = Increase ability IS cost
Blocking = +10 IS per round when in interlock (in addition to tooltip bonuses)
Blinded = Decreased Combat Tactics and Toughness*
Concentration = Lowers chance of damage interrupting abilities
Confused = Unable to change stance, disables MA specials*
Determination = Affects duration of negative status effects on you
Enraged = No roll-out/withdraw from interlock
Initiative = Improves accuracy of interlock abilities (Operates as an influence/modifier for the Desperation ability, without Desperation active it has no effect)**
Pacify = Cannot act unless hit*
Powerless = Unable to use abilities
Rooted = Immobile
Stun = Immobile, decreased Combat Tactics, abilities and free fire are unavailable**
Also though not really status effects:
Contested Withdraw = Improves your defense score when trying to withdraw from interlock
Stealth = Standard sneaking can be detected*
Escape and Evasion = Faster moving version of Stealth***
Concealment = As Invisibility but immobile (required for certain Sniper abilities)*
Invisibility = Cannot be detected and revealed but can be attacked by the person detecting them*
* Details provided by thread posters
** Details clarified by thread posters
*** State put forward by thread posters
[EDIT: Post updated to reflect answers given in the thread, asterisks added so later posters do not appear to be discussing answers given in the original post.]