Table 2.

All 24 possible decompositions of the total causal effect (TCE) into a direct effect (NDE), an indirect effect via alone (NIE₁), an indirect effect via alone (NIE₂), and an indirect effect via both and (NIE₁₂). In each decomposition, there is one level-0 effect, one level-1 effect, one level-2 effect, and one level-3 effect. The definitions of each of these effects is given in Table 1. In columns 2–5, the effect types are labeled: 1=000, 2=100, 3=010, 4=001, 5=110, 6=101, 7=011, and 8=111

	Effect and type
Decomposition	NDE	NIE1	NIE2	NIE12
1	1	2	5	8
2	1	2	8	5
3	1	5	2	8
4	1	6	8	2
5	1	8	2	6
6	1	8	6	2
7	2	1	5	8
8	2	1	8	5
9	3	5	1	8
10	3	8	1	6
11	4	6	8	1
12	4	8	6	1
13	5	1	3	8
14	5	3	1	8
15	6	1	8	3
16	6	4	8	1
17	7	8	1	4
18	7	8	4	1
19	8	1	3	7
20	8	1	7	3
21	8	3	1	7
22	8	4	7	1
23	8	7	1	4
24	8	7	4	1