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Table 3 Instrument strength of each replication trait of interest. N sample size, nSNPs number of SNPs at genome-wide significance (p < 5 × 10−8) after LD clumping

From: Establishing the relationships between adiposity and reproductive factors: a multivariable Mendelian randomization analysis

Trait

N

nSNPs

R2

F statistic

Childhood body mass index (from EGG)

39,618

16

0.0236

59.89

Adulthood body mass index (from GIANT)

171,970

37

0.0145

68.25

Age at menarche (from ReproGen)

182,416

60

0.0261

81.52

Age at menopause (from ReproGen)

69,360

39

0.0420

77.89

Age at first birth (from SSGAC)

189,656

5

9.14 × 10−4

34.70