Medical student depression and its correlates across three international medical schools

Table 4 Multiple linear regression on medical student depression measured by patient health questionnaire-2 in response to demographic, behavioral and psychological variables

Predictor variables	R2	Adjusted R2	F	Significance	B	Std. Error	β	t
Model	0.473	0.461	41.621	P < 0.001
Age					0.025	0.027	0.043	0.906
Male					-0.089	0.101	-0.032	-0.881
Sleep					0.006	0.105	0.002	0.055
Exercisea					-0.120	0.044	-0.103	-2.756
Unmet mental health needsa					0.235	0.041	0.228	5.780
Emotional exhaustiona					0.496	0.072	0.271	6.903
Stress					-0.264	0.122	-0.086	-2.155
Middle Eastern countrya					1.477	0.157	0.475	9.439
Chinaa					1.005	0.155	0.338	6.492

^aP < 0.01. Associated changes in R² for the following independent variable last added into the model, as its unique contribution to the improvement in the model’s goodness-of-fit: Exercise: 0.01; Unmet mental health needs: 0.045; Emotional Exhaustion: 0.061; Stress: 0.006; Middle Eastern country: 0.113; China: 0.054