Table 4.

Multinomial logistic regression of childhood variables predicting trajectory groups of bullying perpetration and narcissistic personality traits.

	Trajectory group contrasts of bullying
	Moderate stable vs. low decreasing
	OR	95% CI
Demographic variables
Sex	1.286	[0.811, 2.039]
Race	1.370	[0.742, 2.529]
Household income	0.888	[0.698, 1.129]
Parent education	0.997	[0.782, 1.272]
Psychological and emotional variables
Hyperactivity	1.570*	[1.240,1.987]
Anxiety	1.085	[0.839, 1.404]
Frustration	1.200	[0.915, 1.573]
Empathic concern	0.808	[0.645, 1.012]
	Trajectory group contrasts of narcissistic personality traits
	High increasing vs. low decreasing		Moderate stable vs. low decreasing
	OR	95% CI	OR	95% CI
Demographic variables
Sex	0.435*	[0.255, 0.742]	0.642	[0.405, 1.020]
Race	1.336	[0.598, 2.985]	1.527	[0.773, 3.016]
Household income	1.258	[0.942, 1.679]	1.135	[0.898, 1.435]
Parent education	1.302	[0.980, 1.730]	1.185	[0.930, 1.511]
Psychological and emotional variables
Hyperactivity	1.224	[0.914, 1.634]	1.073	[0.836, 1.378]
Anxiety	0.478*	[0.349, 0.655]	0.682*	[0.534, 0.871]
Frustration	1.519*	[1.128, 2.046]	1.116	[0.874, 1.424]
Empathic concern	1.053	[0.803, 1.380]	0.897	[0.715, 1.124]

Sex coded as 0 = boys and 1 = girls. Low decreasing trajectory group was comparison group for all contrasts.

^*p < 0.05.