Table 5.

Results of the stepwise multiple linear regression of impulsivity in younger adolescents (13–15) (N = 3776)

	Model 1				Model 2				Model 3				Model 4
	B	SE	β	t	B	SE	β	t	B	SE	β	t	B	SE	β	t
Independent variables
Parental attachment	−1.67	0.17	−0.26	−10.08***	−1.34	0.17	−0.21	−7.71***	−1.18	0.18	−0.18	−6.70***	−1.08	0.18	−0.17	−6.04***
Social group attachment					−0.96	0.17	−0.15	−5.23***	−0.92	0.17	−0.14	−5.33***	−0.90	0.17	−0.14	−5.23***
Satisfaction with teachers									−0.71	0.15	−0.13	−4.89***	−0.65	0.15	−0.12	−4.42***
Emotion regulation													−0.11	0.04	−0.07	−2.76**
Model statistics
R2	0.066				0.086				0.101				0.105
ΔR2					0.020				0.015				0.005
Adj. R2	0.066				0.084				0.099				0.103
F	101.54***				66.73***				53.17***				41.92***
ΔF					30.52***				23.88***				7.60**

Parental attachment was measured using the Inventory of Parent and Peer Attachment (IPPA; Armsden & Greenberg, 1987; Portuguese version by Machado & Oliveira, 2007). Social group attachment was measured using the Social Group Attachment Scale (SGAS; Smith et al., 1999; Portuguese version by Dinis et al., 2008). Emotion regulation was measured using the Situational Test of Emotional Management-Brief (STEM-B; Allen et al., 2015; Portuguese version by da Motta et al., 2021). The unstandardized, as well as the standardized, regression coefficients are presented.

^*p < 0.05; ^**p < 0.01; ^***p < 0.001