Table 1.

Means (and standard deviations) of study variables by experimental condition among boys

	High-status peer condition (N = 70)		Low-status peer condition (N = 68)		t	df	p	95 % CI	Cohen’s d
	M	SD	M	SD
Manipulation check
Perception of e-confederates’ likeability	4.93	1.16	3.42	1.34	7.12	136	<.001	[1.10, 1.94]	1.20
Perception of e-confederates’ popularity	4.72	1.19	3.29	1.25	6.89	136	<.001	[1.02, 1.84]	1.17
Prosocial scoresa
Pre-experiment	6.41/1.81	2.18/.57	6.52/1.79	2.04/.53	.18	136	.856	[−.17, .20]	.04
“Public” chat room	7.90/1.38	1.47/.43	7.06/1.61	2.22/.60	−2.49	121.58	.014	[−.40, −.05]	.44
“Private” chat room	7.45/1.50	2.01/.56	6.79/1.67	2.41/.65	−1.72	136	.088	[−.38, .03]	.28
DS “Public” chat room–Pre-experiment	1.49/−.42	2.16/.57	.54/−.18	2.27/.60	−2.40	136	.018	[−.44, −.04]	.41
DS “Private”–“Public” chat room	−.45/.11	1.02/.29	−.27/.07	.91/.27	.96	136	.338	[−.05, .14]	.14

Positive raw scores indicate increases in prosocial scores and negative raw scores indicate decreases in prosocial scores. 95 % CI = 95 % confidence intervals for mean differences

DS Difference scores

^aBoth raw and transformed (i.e., inverse square-root transformed) mean scores of prosocial behavior are presented in the table (i.e., raw/transformed). Comparisons between the two experimental conditions and the resulting t tests, 95 % CI and Cohen’s ds were calculated using transformed scores