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Table 2 Genetic causal effect of metformin use on potential mediators

From: Genetic effect of metformin use on risk of cancers: evidence from Mendelian randomization analysis

Potential mediators

GWAS identifier/reference

Beta1

Lo_95CI

Up_95CI

P1_value

BMI

ebi-a-GCST006802 [45]

 − 4.00E−01

 − 1.51E+00

7.10E−01

4.80E−01

Weight

ukb-b-11842

 − 1.72E−01

 − 2.02E+00

1.68E+00

8.55E−01

Waist circumference

ieu-a-67 [46]

5.12E−01

 − 1.70E+00

2.73E+00

6.50E−01

ASATV

ebi-a-GCST90016672 [47]

 − 2.40E−01

 − 2.56E+00

2.08E+00

8.40E−01

VATV

ebi-a-GCST90016671 [47]

2.41E−01

 − 1.61E+00

2.09E+00

7.99E−01

Whole body fat-free mass

ukb-b-13354

 − 6.68E−02

 − 1.32E+00

1.19E+00

9.17E−01

Body fat percentage

ukb-b-8909

 − 1.82E−01

 − 1.45E+00

1.08E+00

7.78E−01

WBC

ebi-a-GCST004610 [48]

 − 1.21E−01

 − 1.05E+00

8.11E−01

7.99E−01

CRP

ieu-b-4764

 − 1.99E−01

 − 1.35E+00

9.52E−01

7.35E−01

HDL cholesterol

ieu-b-109 [49]

 − 2.38E+00

 − 4.40E+00

 − 3.62E−01

2.08E−02*

LDL cholesterol

ieu-b-5089

 − 2.37E+00

 − 3.21E+00

 − 1.54E+00

2.38E−08*

Total cholesterol

ieu-a-301 [50]

 − 6.69E−01

 − 3.02E+00

1.68E+00

5.77E−01

SHBG

ebi-a-GCST90012111 [51]

 − 1.50E+00

 − 2.08E+00

 − 9.24E−01

3.57E−07*

Total testosterone

ebi-a-GCST90012114 [51]

 − 6.04E−01

 − 9.99E−01

 − 2.08E−01

2.76E−03*

Bioavailable testosterone

ebi-a-GCST90012102 [51]

9.28E−01

3.35E−01

1.52E+00

2.15E−03*

Estradiol levels

ebi-a-GCST90012105 [51]

 − 1.23E−01

 − 2.32E−01

 − 1.31E−02

2.82E−02*

Fasting insulin

ebi-a-GCST90002238 [52]

 − 3.85E−01

 − 1.34E+00

5.68E−01

4.28E−01

Fasting glucose

ebi-a-GCST005186 [53]

2.65E+00

1.06E+00

4.23E+00

1.06E−03*

HbA1c

ieu-b-104 [54]

 − 3.96E−01

 − 9.88E−01

1.97E−01

1.90E−01

Telomere length

ieu-b-4879

 − 6.25E−03

 − 4.43E−01

4.30E−01

9.78E−01

  1. All the results above were derived from the IVW method.
  2. *P1_value < 0.05; Lo_95CI, the lower margin of beta 1’s 95% confidence interval; Up_95CI, the upper margin of beta 1’s 95% confidence interval; SHBG,Sex hormone-binding globulin; VATV, Visceral adipose tissue volume; ASATV, Abdominal subcutaneous adipose tissue volume; HDL, high-density lipoprotein; LDL, low-density lipoprotein; WBC, White blood cell