Table 2

Estimated contribution of differential exposure and susceptibility to stressful family conditions on the total effect of maternal education on child intelligence of 13-year-old children

	Differential exposure			Differential susceptibility			Total effect
	Absolute	95% CI	Relative	Absolute	95% CI	Relative	Absolute	95% CI
Financial stress
Medium education versus high education	−0.02	−0.03 to 0.01	7%	−0.02	−0.06 to 0.01	5%	−0.29	−0.37 to 0.23
Low education versus high education	−0.05	−0.08 to 0.02	9%	−0.01	−0.03 to 0.02	1%	−0.54	−0.64 to 0.45
Social stress
Medium education versus high education	0.00	−0.00 to 0.01	0%	0.01	−0.02 to 0.03	0%	−0.29	−0.36 to 0.23
Low education versus high education	−0.01	−0.02 to 0.00	1%	−0.01	−0.04 to 0.02	1%	−0.53	−0.62 to 0.43
Total stress
Medium education versus high education	−0.01	−0.01 to 0.00	2%	−0.02	−0.06 to 0.01	5%	−0.29	−0.36 to 0.23
Low education versus high education	−0.03	−0.06 to 0.01	6%	0.00	−0.01 to 0.03	0%	−0.53	−0.62 to 0.43

Outcome and mediator variables were standardised. The total effect consists of four components: CDE, PIE, INTref and INTmed. Differential exposure is defined as the sum of the components PIE and INTmed; differential impact/susceptibility is defined as the sum of the components INTref and INTmed.
CDE, controlled direct effect; INTmed, mediated interaction; INTref, reference interaction; PIE, pure indirect effect.