Table 3.

Parameter estimates and 95% confidence intervals for the best-fit model (model X) for symptoms of anxiety and depression (T₁ to T₄)a

	λ path		Residual		Genetic factors					Unique environmental factor
Factor (age)	P	S	P	S	Total a2 (%)	1	2	3	4	Total e2 (%)	1	2
1	0.77	–	0.33	–	72	0.85	–	–	–	28	0.53	–
(8–9)	0.42–0.94		0.00–0.58			0.79–0.90					0.44–0.61
2	0.73	0.45	0.56	0.65	89	0.46	0.83	–	–	11	0.22	0.25
(13–14)	0.62–0.83	0.38–0.54	0.50–0.61	0.55–0.75		0.36–0.55	0.77–0.87				0.11–0.33	0.13–0.36
3	0.65	0.49	0.49	0.58	84	0.48	0.58	0.53	–	16	0.13	0.38
(16–17)	0.55–0.75	0.41–0.58	0.00–0.56	0.00–0.66		0.37–0.58	0.49–0.66	0.43–0.60			0.00–0.26	0.26–0.48
4	0.75	0.45	0.57	0.69	79	0.34	0.42	0.37	0.60	21	0.04	0.46
(19–20)	0.65–0.86	0.38–0.53	0.43–0.65	0.58–0.76		0.20–0.46	0.32–0.52	0.23–0.50	0.51–0.68		−0.13 to 0.21	0.33–0.58

a², Heritability, or the proportion of variance in fear scores resulting from genetic factors; e², the proportion of variance in fear scores resulting from unique environmental factors.

The λ path, depicted in Fig. 1, connects the latent liability to fears to the report level of fears from parent-report (P) and self-report (S).

^aResults for the ‘upper part’ of the model only (see Fig. 1), which includes symptoms of anxiety and depression (SxAnxDep) shared by parent- and self-reporters. Parameter estimates constrained to equality across the sexes and the value of r_g set to 1.0. Parameter estimates for the lower part of the model are available in Table A2 (online).