Table 2 Genotype and allele frequency of the PER3 VNTR in the morning, intermediate, and evening types

From: Lack of association between PER3 variable number tandem repeat and circadian rhythm sleep–wake disorders

Type

N

Genotype [N (%)]

Allele [N (%)]

χ 2

P

  

4/4

4/5

5/5

4

5

  

Morning

245

160 (65.31)

81 (33.06)

4 (1.63)

401 (81.84)

89 (18.16)

3.1694

0.205

Intermediate

594

421 (70.88)

152 (25.59)

21 (3.54)

994 (83.67)

194 (16.33)

  

Evening

86

54 (62.79)

27 (31.40)

5 (5.81)

135 (78.49)

37 (21.51)

  
  1. N number, 4/4 homozygosity for the 4-repeat allele, 4/5 heterozygosity, 5/5 homozygosity for the 5-repeat allele, P P value for the difference in allele frequency among the morning, intermediate, and evening types
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