(a) Effects of age, sex, brooding and reflection on depression

	Unstandardized coefficients		Standardized  coefficients	Sig.	95.0% confidence interval for B		R 2
	B	Std. Error	Beta	P	Lower bound	Upper bound
Sex	−2.088	3.611	−.118	.564	−9.197	5.021	0.052
Age group 1 (≤24 y.)	−4.588	3.622	−.218	.206	−11.718	2.541	0.123
Age group 3 (38–50 y.)	.781	4.738	.034	.869	−8.547	10.109
Age group 4 (51–62 y.)	−4.683	5.278	−.192	.376	−15.074	5.708
Age group 5 (≥63 y.)	−4.218	3.374	−.193	.212	−10.860	2.424
IA sex × age group 1	7.376	5.544	.284	.184	−3.538	18.291	0.202
IA sex × age group 3	1.131	6.499	.040	.862	−11.664	13.925
IA sex × age group 4	7.183	6.490	.263	.269	−5.594	19.960
IA sex × age group 5	6.428	4.920	.255	.193	−3.258	16.113
RSQ subscale brooding	1.375	.197	.411	.000	.986	1.763	0.259
RSQ subscale reflective pondering	−.053	.327	−.019	.871	−.697	.591	0.271
IA reflective pondering × age group 1	1.429	.673	.423	.035	.103	2.754	0.287
IA reflective pondering × age group 3	.168	.719	.045	.816	−1.248	1.584
IA reflective pondering × age group 4	.882	.893	.228	.324	−.876	2.640
IA reflective pondering × age group 5	2.135	.778	.438	.006	.603	3.668
IA sex × reflective pondering	.956	.529	.387	.072	−.086	1.997	0.288
IA sex × age group 1 × reflective pondering	−2.220	.906	−.570	.015	−4.003	−.436	0.312
IA sex × age group 3 × reflective pondering	−1.048	1.009	−.215	.300	−3.034	.939
IA sex × age group 4 × reflective pondering	−1.933	1.048	−.450	.066	−3.997	.130
IA sex × age group 5 × reflective pondering	−2.255	.981	−.409	.022	−4.187	−.323

IA: interaction, refl.: reflective pondering. Interaction effects were not included in the final model if they were not significant; R² is reported for the model containing the particular variable and all variables listed before that variable.