Table 1 Structural equation model for the interacting effect of oxytocin receptor (OXTR) rs53576 genotype × maternal postpartum depression on child behavioural problems.

	Internalising problems		Externalising problems
	β	95% CI	β	95% CI
Crude model
OXTR ^a	−0.072	−0.162 to 0.018	0.034	−0.056 to 0.125
Maternal postpartum depression^b	0.155	0.001 to 0.309*	0.184	0.055 to 0.314*
OXTR^a × Maternal postpartum depression^b	−0.023	−0.172 to 0.126	−0.210	−0.359 to −0.062*
Adjusted model ^c
OXTR ^a	−0.067	−0.157 to 0.022	0.036	−0.053 to 0.125
Maternal postpartum depression^b	0.119	−0.034 to 0.271	0.177	0.043 to 0.312*
OXTR^a × Maternal postpartum depression^b	−0.025	−0.166 to 0.115	−0.185	−0.330 to −0.040*

β’s correspond to standardized coefficients.
^aAA was coded as 0 and GG/GA as 1.
^bNon-depressed mothers were coded as 0 and possibly depressed mother as 1.
^cCovariates included child gender, gestational age, birth weight, maternal education, house income, and history of maternal affective disorder.
*The 95% confidence interval (CI) does not cross zero, which is equivalent to p < 0.05.

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