Table 1 Distribution and demographics of chronotype in the UK Biobank

From: Genome-wide association analyses of chronotype in 697,828 individuals provides insights into circadian rhythms

Chronotype category

Phenotype coding

N

Sex (% male)

Age (SD)

TDI

BMI (S.D.)

Definitely morning

2

107,555

43.6

57.7 (7.7)

−1.4

27.5 (4.8)

More morning than evening

1

144,731

43.9

57.0 (7.9)

−1.7

27.1 (4.6)

Don’t know

0

46,538

57.1

56.8 (8.0)

−1.43

27.3 (4.7)

More evening than morning

−1

115,090

45

56.1 (8.2)

−1.41

27.4 (4.8)

Definitely evening

−2

35,818

46.8

55.3 (8.3)

−1.05

27.9 (5.2)

All

 

449,732

45.7

56.8 (8.0)

−1.47

27.4 (4.8)

  1. Summary of sex, age, townsend deprivation index (TDI) and BMI by chronotype categories in European-ancestry individuals from the UK Biobank study. SD denotes standard deviation
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