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Table 7 Prevalence estimates in wave 1 when using both twins versus one twin in each pair

From: Prevalence and stability of mental disorders among young adults: findings from a longitudinal study

 

12-month prevalence estimate using both twins 95% CIc

12-month prevalence estimate only including one twin from each pair 95% C.I.

Ratio

Entire sample estimate/Estimate using one twin from each pair

MDD

6.2

5.0–7.4

6.2

4.5–8.0

1.00

Any anxiety disorder W1a

20.4

18.3–22.7

19.6

17.2–22.5

1.04

AUD

6.0

4.8–7.3

5.8

4.4–7.5

1.03

Any mental disorder W1b

27.8

25.4–30.3

27.8

24.7–31.0

1.00

  1. Legends: CI Confidence interval, MDD Major depressive disorder
  2. aPanic disorder, agoraphobia without panic, specific phobias, social phobia, generalized anxiety disorder (GAD), obsessive-compulsive disorder (OCD), and/or post-traumatic stress disorder (PTSD)
  3. AUD Alcohol use disorders, i.e. alcohol dependence or alcohol abuse
  4. bAny mental disorder W1 = Any mood disorder, Any anxiety disorder W1, AUD
  5. c95% CIs are based on standard errors obtained from bootstrapping (1000 replications), bias corrected for skewness in the bootstrap distribution, and adjusted for cluster-effects among twins
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