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Table 1 Characteristics of instrumental variable of exposure, outcome and confounders used for MR analysis

From: The causal associations of circulating lipids with Barrett’s Esophagus and Esophageal Cancer: a bi-directional, two sample mendelian randomization analysis

Type of variables

GWAS ID

Year

Trait

PMID

Author

Consortium

Population

Sample size

Number of SNPs

Exposure

ebi-a-GCST002223

2013

HDL cholesterol

24,097,068

Willer CJ

NA

European

94,595

2,418,527

ebi-a-GCST90002412

2020

LDL cholesterol

32,493,714

Klimentidis YC

NA

European

431,167

16,293,344

met-d-Total_C

2022

Total cholesterol

NA

Borges CM

NA

European

115,078

12,321,875

ebi-a-GCST002216

2013

Triglycerides

24,097,068

Willer CJ

NA

European

94,595

2,410,057

Outcomes

finn-b-C3_OESOPHAGUS

2021

Esophageal cancer

NA

NA

NA

European

218,792

16,380,466

finn-b-K11_BARRET

2021

Barret Esophagus

NA

NA

NA

European

190,190

16,380,373

Confounders

ebi-a-GCST90000514

2021

Gastroesophageal reflux

34,187,846

Ong JS

NA

European

602,604

2,320,781

ukb-b-2303

2018

Body mass index

NA

Ben Elsworth

MRC-IEU

European

454,884

9,851,867

  1. MR, Mendelian randomization; GWAS, genome-wide association studies; SNPs, single-nucleotide polymorphisms; NA, not available