Epona,

Sutton table
Most questions can be answered taking that table as a start. But it took me a while to find out how the cross tabulations work.

in short:
(P)IRA (without DAAD) according to that table is responsible for 1706 of the 2055 for all republican paramilitaries together.
Next deadly organisation is UVF, 426, BTW, then British Army, 297)
Next deadly organisation on the Republican side is the INLA (113).

The 1706 dead for which the IRA is responsible in Suttons table (status summary by organisation crosstabulation) can be split up like this:
1011 British security (285 RUC and ex-RUC; 455 British Army; 222 UDR or ex-UDR; the rest being smaller number of (ex)-Prison officers, Royal navy; territorial army, British police etc)
516 Civilian
   7 Irish security
32 Loyalist Paramilitaries
140 Republican Paramilitaries

Wolfgang