A developmental psychopathology study tracked familial transmission of mental health disorders using regional healthcare registry data over a 40-year period. The findings for offspring diagnosed with Generalized Anxiety Disorder (GAD) or Major Depressive Disorder (MDD) by age 45 are shown in Table 1 below.

Table 1: Familial risk and sample sizes for GAD and MDD diagnoses

	Generalized Anxiety Disorder (GAD)		Major Depressive Disorder (MDD)
Parental Diagnosis status	% of offspring diagnosed by age 45	Number of parental couples	% of offspring diagnosed by age 45	Number of parental couples
Both parents diagnosed with the disorder	22.4	145	29.8	92
One parent diagnosed with the disorder	6.8	9,210	8.1	7,450
Neither parent diagnosed with the disorder	1.1	950,000	1.3	950,000

To what extent can these findings be considered reliable?

Table 1: Familial risk and sample sizes for GAD and MDD diagnoses

	Generalized Anxiety Disorder (GAD)		Major Depressive Disorder (MDD)
Parental Diagnosis status	% of offspring diagnosed by age 45	Number of parental couples	% of offspring diagnosed by age 45	Number of parental couples
Both parents diagnosed with the disorder	22.4	145	29.8	92
One parent diagnosed with the disorder	6.8	9,210	8.1	7,450
Neither parent diagnosed with the disorder	1.1	950,000	1.3	950,000

To what extent can these findings be considered reliable?

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Table 1: Familial risk and sample sizes for GAD and MDD diagnoses

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Question 1

Table 1: Familial risk and sample sizes for GAD and MDD diagnoses

Markscheme

How science works

Question 1

Table 1: Familial risk and sample sizes for GAD and MDD diagnoses

How science works Questions

How science works

Question 1

Table 1: Familial risk and sample sizes for GAD and MDD diagnoses

How science works Questions