Table 1 The final multivariate linear model with infants’ look percentage as an outcome measure.

Model	Variables	Estimate	SE	Std. Beta	t value	p value	Model summary
A	(Constant)	0.805	0.022		36.702	< 0.001	F (5, 104) = 4.479, p < 0.001, R² = 0.177
	nIP	−0.029	0.011	−0.235	−2.582	0.011
	BAI w17	0.055	0.018	0.887	3.024	0.003
	EPDS w17	−0.008	0.007	−0.131	−1.099	0.274
	IP	−0.004	0.011	−0.036	−0.389	0.698
	IP*BAI w17	−0.038	0.011	−0.991	−3.408	< 0.001
B	(Constant)	0.804	0.022		36.662	< 0.001	F (4, 105) = 5.287, p < 0.001, R² = 0.168
	nIP	−0.029	0.011	−0.237	−2.599	0.011
	IP	−0.004	0.011	−0.035	−0.378	0.706
	BAI w17	0.051	0.018	0.832	2.874	0.005
	IP*BAI w17	−0.039	0.011	−1.023	−3.534	< 0.001
C	(Constant)	0.820	0.055		14.791	< 0.001	F (8, 99) = 2.888, p = 0.006, R² = 0.189
	nIP	−0.029	0.012	−0.232	−2.495	0.014
	IP	−0.002	0.012	−0.015	−0.152	0.880
	BAI w17	0.052	0.018	0.843	2.833	0.006
	IP*BAI w17	−0.040	0.011	−1.058	−3.572	< 0.001
	Infant’s sex	0.001	0.012	0.005	0.50	0.960
	Mother’s education	0.022	0.014	0.164	1.588	0.115
	Mother’s smoking habit	0.004	0.013	0.028	0.274	0.785
	Mother’s age at birth	−0.002	0.002	−0.129	−1.300	0.197

Model A includes all significant variables united from Table 2. Model B uses the backward stepwise method to eliminate variables and improve the model. Model C is the final model after adjusting for infant sex, mother’s education, smoking habit, and the mother’s age birth.
SE, Standardized Error; Std. Beta, Standardized Beta; EPDS, Edinburgh Postnatal Depression Scale; BAI, Beck Anxiety Inventory; w17, pregnancy week 17; w32, pregnancy week 32; pv6, postpartum 6 weeks; pm6, postpartum 6 months; IP, interpersonal events; nIP, non-interpersonal events.

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