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Table 1 The study sample of bipolar disorder twins and co-twins.

From: Seasonal changes, sleep length and circadian preference among twins with bipolar disorder

Affection status

Zygosity

Sex

Both twins participated, n = 54

  

BP*-Healthy*

DZ

FF

BP*-Healthy*

DZ

FF

BP*-Healthy*

DZ

FF

BP*-Healthy*

DZ

MM

BP*-Healthy

DZ

MF

BP-Healthy*

DZ

MF

BP-Healthy*

DZ

FF

BP-Healthy*

DZ

FF

BP*-Healthy

DZ

FF

BP*-Healthy

MZ

FF

BP-Healthy*

DZ

FF

BP-Healthy*

DZ

FF

BP*-Healthy

DZ

FF

BP-Healthy

DZ

MM

BP-Healthy

MZ

MM

BP-Alcohol abuse

DZ

MM

BP-Alcohol abuse*

DZ

FF

BP*-MDD

DZ

FM

BP*-Schizophrenia*

MZ

MM

BP*-MDD*

DZ

FF

BP*-MDD*

DZ

FF

BP*-BP*

MZ

FF

BP*-BP*

DZ

FF

BP*-BP

MZ

MM

BP*-BP

DZ

MM

BP-BP

MZ

MM

Healthy-Healthy

MZ

FF

One twin participated, n = 13 (Co-twin did not participate, n = 13)

BP*-(Schizophrenia)

DZ

MM

BP*-(BP)

DZ

MM

BP*-(Healthy)

DZ

MM

BP-(Alcohol abuse)

DZ

MM

Healthy-(BP)

DZ

MM

Healthy-(BP)

DZ

MM

BP-(Healthy)

DZ

MM

Healthy-(BP)

DZ

MM

BP-(BP)

DZ

MM

MDD-(BP)

MZ

FF

Post-partum depression-(BP)

DZ

FM

BP-(Schizophrenia)

DZ

FM

BP-(BP)

DZ

MM

  1. *Subjects who filled in the MEQ in 2002, n = 36. Abbreviations: BP = bipolar disorder, MDD = major depressive disorder, DZ = dizygotic, MZ = monozygotic, M = male, F = female.