Normative data for the self-reported and parent-reported Strengths and Difficulties Questionnaire (SDQ) for ages 12–17

Table 3 Per SDQ version, Cronbach’s alpha (α) and nonlinear structural equation modelling reliability (ρ_NL) coefficients

SDQ scale	α	ρ_NL	α	ρ_NL
SDQ scale	Self-reported SDQ version		Parent-reported version
Emotional	0.71	0.73	0.75	0.84
Conduct	0.47	0.51	0.57	0.63
Hyperactivity	0.76	0.79	0.78	0.87
Social	0.56	0.59	0.61	0.65
Prosocial	0.58	0.61	0.72	0.75
Externalizing	0.74	0.81	0.77	0.90
Internalizing	0.72	0.79	0.77	0.88
Total	0.69	0.76	0.74	0.86

ISSN: 1753-2000