Table 2 Phenotypic associations between natural hair colour and puberty timing in UK Biobank men and women.

From: Genomic analysis of male puberty timing highlights shared genetic basis with hair colour and lifespan

Natural hair colour

Effecta in men

95% CI in men

P-value in men

Effecta in women

95% CI in women

P-value in women

Blond

(ref)

  

(ref)

  

Red

1.17

1.02, 1.35

0.02

−0.100

−0.134, −0.066

6.2 × 10 −9

Light brown

1.00

0.91, 1.09

0.92

−0.026

−0.047, −0.005

0.01

Dark brown

1.45

1.34, 1.58

6.7 × 10 −18

−0.093

−0.114, −0.072

6.7 × 10 −18

Black

1.63

1.46, 1.81

1.2 × 10 −19

−0.059

−0.113, −0.005

0.03

  1. CI confidence interval.
  2. aEffect size in men (n = 179,549) is odds ratio for early relatively voice breaking (relative to blond hair). Effect size in women (n = 238,195) is mean difference in age at menarche in years (relative to blond hair).
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