TABLE I.

Factor Loadings (a) and Model-Fitting (b) Results for the Two Independent Samples and Total Sample Comparing the Null Model with the One-Factor (General Aggression) Model and the Two-Factor (Proactive–Reactive) Model

	Reactive			Reactive
	S1	S2	Total	S1	S2	Total
(a) Factor loadings
Yelled when annoyed	.40	.52	.48
Angry when provoked	.46	.67	.59
Angry when frustrated	.51	.63	.59
Temper tantrums	.46	.52	.51
Damaged things when mad	.64	.62	.63
Angry when don’t get way	.59	.58	.58
Mad when lost a game	.40	.49	.46
Angry when threatened	.47	.49	.49
Felt better after hitting	.70	.61	.65
Hit to defend self	.59	.55	.56
Hit when teased	.66	.65	.65
Fight for status				.58	.49	.52
Taken things from others				.59	.55	.56
Vandalized for fun				.53	.65	.62
Gang fight to be cool				.62	.57	.59
Hurt others to win game				.51	.58	.56
Force to manipulate others				.57	.61	.61
Force to obtain money				.69	.43	.52
Threatens and bullies				.56	.66	.63
Obscene phone calls for fun				.41	.58	.52
Manipulate others to gang up				.55	.59	.56
Carried weapon for use				.63	.64	.64
Yelled to manipulate				.63	.56	.59
(b) Fit indices
	χ2	df	AIC	CFI	NNFI	IFI	RMSEA
Sample 1
Null model	1314	253	808
One factor	474	230	14	.77	.77	.77	.08
Two factor	294	229	−163	.86	.84	.87	.04
Sample 2
Null model	1509	253	1003
One factor	495	230	35	.79	.79	.79	.08
Two factor	296	229	−161	.90	.89	.91	.041
Total sample
Null model	2478	253	1972
One factor	621	230	161	.82	.81	.82	.072
Two factor	334	229	−123	.91	.90	.91	.037

S1 (N = 170) = replication sample 1, S2 (N = 164) = replication sample 2, total sample = 334.

AIC, Akiake information criterion; RMSEA, root mean-squared error of approximation index; CFI, comparative fit index; NNFI, non-normed fit index; IFI, Bollen incremental fit index.

All χ² values are statistically significant (P < .0001).