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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.