Depressive symptoms, conduct problems and alcohol use from age 13 to 19 in Norway: evidence from the MyLife longitudinal study

Table 2 Comparison of the linear, quadratic, and cubic growth curve models

Model	Pseudo log likelihood	Deviance	df	∆χ²	∆df	p	AIC	BIC
Symptoms of depression
Intercept only	-37,137	74,275	3				74,281	74,303
Linear change	-36,665	73,330	6	945	3	< 0.001	73,342	73,387
Quadratic change*	-36,623	73,245	7	85	1	< 0.001	73,259	73,311
Cubic change	-36,623	73,245	8	0	1	0.581	73,261	73,320
Depressive disorder
Intercept only	-4250	8500					8504	8518
Linear change	-4148	8296	3	203	3	< 0.001	8302	8324
Quadratic change*	-4139	8277	4	19	1	< 0.001	8285	8315
Cubic change	-4138	8277	5	1	1	0.417	8287	8324
Symptoms of conduct disorder
Intercept only	-22,706	45,412	3				45,418	45,440
Linear change	-22,610	45,220	6	192	3	< 0.001	45,232	45,277
Quadratic change*	-22,603	45,206	7	14	1	< 0.001	45,220	45,272
Cubic change	-22,603	45,206	8	0	1	1.000	45,222	45,281
Conduct problems
Intercept only	-3791	7581	2				7585	7600
Linear change	-3789	7579	3	3	1	0.108	7585	7607
Quadratic change*	-3781	7562	4	17	1	< 0.001	7570	7600
Cubic change	-3779	7558	5	4	1	0.047	7568	7605
Any alcohol use
Intercept only	-8158	16,316	2				16,320	16,335
Linear change	-5576	11,153	3	5164	1	< 0.001	11,159	11,181
Quadratic change*	-5567	11,135	4	18	1	< 0.001	11,143	11,172
Cubic change	-5566	11,132	5	3	1	0.094	11,142	11,179
Risky drinking
Intercept only	-5135	10,270	2				10,274	10,289
Linear change	-3896	7792	3	2478	1	< 0.001	7798	7821
Quadratic change*	-3880	7759	4	33	1	< 0.001	7767	7797
Cubic change	-3880	7759	5	0	1	0.572	7769	7806

ISSN: 1753-2000