Table 4. Parameter estimates for Dyadic Multilevel models of P2 response and slow wave as a function of psychological distress (of the actor, partner and the interaction of the actor and partner) and excluder identity in best friend dyads

P2 response	Estimate	(SE)	ta	Pb	CI95c
					Lower	Upper
Intercept	2.94	0.39	7.42	0.001***	2.10	3.77
Excluder identity	−1.87	0.71	−2.60	0.018*	−3.38	−0.35
Actor distress	0.75	0.52	1.44	0.154	−0.29	1.80
Actor distress*excluder identity	−3.37	0.99	−3.38	0.001***	−5.37	−1.37
Partner distress	0.64	0.52	1.24	0.219	−0.39	1.69
Partner distress*excluder identity	−0.02	0.99	−0.02	0.979	−2.02	1.97
Actor*partner distress	−0.37	0.41	−0.88	0.387	−1.24	0.50
Actor*partner distress*excluder identity	−1.12	0.75	−1.49	0.154	−2.71	0.46
Slow wave	Estimate	(SE)	ta	Pb	CI95c
					Lower	Upper
Intercept	−1.15	0.42	−2.70	0.011**	−2.03	−0.28
Excluder identity	−2.81	0.85	−3.27	0.002***	−4.55	−1.06
Actor distress	0.30	0.67	0.44	0.655	−1.04	1.65
Actor distress*excluder identity	−3.27	1.35	−2.41	0.019*	−5.97	−0.56
Partner distress	0.20	0.67	0.30	0.759	−1.14	1.56
Partner distress*excluder identity	0.22	1.35	0.16	0.867	−2.47	2.93
Actor*partner distress	−0.70	0.45	−1.57	0.126	−1.62	0.20
Actor*partner Distress*excluder identity	−3.18	0.90	−3.53	0.001***	−5.01	−1.35

^aDegrees of freedom are 17 for tests of intercepts for P2 and 34 for the tests of intercepts for slow wave;

^bAll P-values are two tailed except in the case of variances, where one-tailed P-values are used (because variances are constrained to be non-negative);

^cConfidence intervals for variances were computed using the Satterthwaite method;

^dCovariances for intercepts of P2 and slow wave were estimated but not reported for the sake of simplicity.

*P ≤0.05, two-tailed;

**P ≤0.01, two-tailed;

***P ≤ 0.001, two-tailed.