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Table 1 The characteristics of included studies and involved participants

From: Association of meat consumption with the risk of gastrointestinal cancers: a systematic review and meta-analysis

Study

Region

Sample size

Age (years)

Sex

Exposure definition

Comparisons

Follow-up (years)

Adjustment factors

Outcome

Study quality

Nomura 1990 (JAH) [23]

USA

7,990

≥ 18

Men and women

FFQ

Quintiles

17.5

Age

GC

6

Bostick 1994 (IWHS) [24, 25]

USA

35,216

55–69

Women

FFQ

Quintiles

5.0

Age, EI, height, parity, vitamin E, vitamin A

CC, PC

8

Kato 1997 (NYUWHS)[26]

USA

14,727

34–65

Women

FFQ

Quartiles

7.1

Age, EI, history of rectal colon polyps

CRC

6

Singh 1998 (AHS) [27]

USA

32,051

≥ 25

Men and women

FFQ

Median

6.0

Age, sex, BMI, PI,parental history of CC, smoking,alcohol, aspirin use

CC

7

Galanis 1998 (JRH) [28]

USA

11,907

≥ 18

Men and women

FFQ

Median

14.8

Age, education, Japanese place of birth, smoking,alcohol

GC

7

Knekt 1999 (FMCHES)[29, 30]

Finland

9,985

15–99

Men and women

Dietary history

Quartiles

24.0

Age, sex, municipality, smoking, EI

CRC, GC, CC, RC

6

Pietinen 1999 (ATBC) [31, 32]

Finland

27,111

50–69

Men

FFQ

Quartiles

8.0

Age, supplement group, smoking, BMI,alcohol,education, PA, calcium intake

CRC, PC

9

Isaksson 2002 (STR) [33]

Sweden

21,884

56

Men and women

FFQ

Tertiles

16.0

Age, sex, smoking

PC

6

Flood 2003 (BCDDP) [34]

USA

45,496

61.9

Women

FFQ

Quintiles

8.5

EI, total meat intake

CRC

8

Michaud 2003 (NHS)[25]

USA

88,802

30–55

Women

FFQ

Quintiles

18.0

Age, smoking, BMI, history of diabetes,EI, height, PA,menopausal status

PC, RC, CC, CRC, HCC

8

Lin 2004 (WHS) [36]

USA

37,547

≥ 45

Women

FFQ

Quintiles

8.7

Age, random treatment assignment, BMI,family history of CRC,history of colorectal polyps, PA, smoking,alcohol, HRT,EI

CRC

8

Wei 2004 (HPFS) [37,38,39,40]

USA

46,632

40–75

Men

FFQ

Quintiles

14.0

Age, family history,BMI, PA,alcohol, calcium intake, folate intake,height, smoking,history of endoscopy,beef/pork/lamb as amain dish

RC, CC, CRC, HCC

8

English 2004 (MCCS) [41]

Australia

37,112

27–75

Men and women

FFQ

Quartiles

9.0

Age, sex, country of birth, EI, fat intake, cereal product intake

CRC, RC, CC

9

Chao 2005 (CPS II) [42, 43]

USA

148,610

50–74

Men and women

FFQ

Quintiles

9.0

Age, EI,education, BMI,smoking, PA, multivitamin use, aspirin use, beer,wine,liquor, HRT,fruit intake, vegetable intake, high-fiber grain food intake

RC, CC, PC

9

Larsson 2005 (SMC) [44,45,46]

Sweden

61,433

40–75

Women

FFQ

Quartiles

13.9

Age, BMI, education, EI, alcohol, saturated fat intake, calcium intake, folate intake, fruit intake, vegetable intake, whole-grain food intake

CRC, RC, GC, PC

7

Norat 2005 (EPIC) [47, 51]

Europe

478,040

21–83

Men and women

FFQ

Quintiles

4.8

Age, sex, center,EI,height, weight,PA,smoking, dietary fiber intake, alcohol intake

CRC, RC, CC, GC, EC, PC, HCC

9

Sauvaget 2005 (LSS) [52]

Japan

38,576

34–98

Men and women

FFQ

Tertiles

20.0

Age, sex, city, radiation dose, smoking, education

GC

7

Nöthlings 2005 (MEC) [53,54,55]

USA

190,545

45–75

Men and women

FFQ

Quintiles

7.0

Age, sex, ethnicity, history of diabetes,family history of PC,smoking, EI

PC, CRC

8

Berndt 2006 (CLUE II) [56]

USA

1,583

48.5

Men and women

FFQ

Tertiles

13.5

Age, race, EI

CRC

6

Kabat 2007 (CNBSS) [57]

Canada

49,654

40–59

Women

FFQ

Quintiles

16.4

Age, BMI, menopausalstatus, OC use, HRT,dietary fat intake, fiber intake, folic acid intake, EI,smoking, alcohol, education, PA

CRC, RC, CC

7

Cross 2007 (NIH-AARP) [58,59,60,61,62,63]

USA

494,036

50–71

Men and women

FFQ

Quintiles

8.2

Age, sex, education, marital status, family history of cancer, race, BMI, smoking, PA, EI, alcohol, fruit and vegetable intake

ES, GC, CRC, HCC, PC

9

Butler 2008 (SCHS) [64, 65]

Singapore

61,321

45–74

Men and women

FFQ

Quartiles

10.0

Age, sex, dialect group,interview year, history of diabetes, smoking,BMI, alcohol,education, PA, family history of CRC, EI

CRC, HCC

8

Lee 2009 (SWHS) [66]

China

73,224

40–70

Women

FFQ

Quintiles

7.4

Age, education,income, survey season,tea intake, NSAID use,EI, fiber intake

CRC, RC, CC

8

Heinen 2009 (NLCS) [67-69

Netherlands

3,980

55–69

Men and women

FFQ

Quintiles

13.3

Age, energy intake, sex, smoking, alcohol, history of diabetes, history of hypertension, BMI,vegetable intake, fruit intake

PC, GC, EC, CRC, RC, CC

7

Wie 2014 (CSEC) [70]

Korea

8,024

48.4

Men and women

3-days food records

Median

7.0

Age, sex, EI, BMI, PA,smoking,alcohol use, income,education, marital status

CRC, GC

7

Nomura 2016 (BWHS) [71, 72]

USA

49,103

21–69

Women

FFQ

Tertiles

15.1

Age, geographic regionof residence, EI, smoking, family history of CRC, education,menopausal status,diabetes, insulin use,aspirin use,colonoscopy, sigmoidoscopy, alcohol, BMI

CRC, CC, PC

8

Hastert 2016 (VITAL) [73]

USA

66,920

50–76

Men and women

FFQ

Median

7.6

Age, education,race/ethnicity, receipt of colonoscopy orsigmoidoscopy, family history of CC or RC, NSAID use, history of cancer other than CRC, EI

CRC

7

Jones 2017 (UKWCS) [74]

UK

32,154

52

Women

FFQ

Quintiles

17.4

Age, BMI, EI, PA, smoking,socioeconomic status,family history of CRC

CRC, RC, CC

8

Wada 2017 (Takayama) [75]

Japan

30,331

≥ 35

Men and women

FFQ

Quartiles

16.0

Age, height, BMI,PA,smoking, education,aspirin use, alcohol, fiber intake,calcium intake, vitamin D intake, EI

CRC, RC, CC

7

Pang 2018 (CKB) [76]

China

512,891

30–79

Men and women

FFQ

Median

9.0

Age, sex, study area, education, smoking,alcohol, BMI, PA

PC

8

Diallo 2018 (NSS) [77, 78]

France

61,476

≥ 35

Men and women

24-hour dietary records

Quintiles

4.1

Age, sex, EI,alcohol, number of 24-hour dietary records, smoking,education, PA, height, BMI,family history of cancer, lipids intake,fruit intake, vegetable intake, number of children, red meat intake, processed meat intake

CRC

7

Islam 2019 (pooled 6 studies) [79, 80]

Japan

232,403

40–79

Men and women

FFQ

Quartiles

≥ 10.0

Age, area, history of diabetes, BMI,smoking, alcohol, PA, EI,

calcium intake, fiber intake

CRC, RC, CC

7

Mehta 2020 (Sister study) [81]

USA and Puerto Rico

48,704

35–74

Women

FFQ

Quartiles

8.7

EI, BMI,education, PA, race/ethnicity,family history of CRC

CRC, RC, CC

7

Nguyen 2020 (SMHS) [82]

China

60,161

40–74

Men

FFQ

Quartiles

8.1

Sex, age, education,income levels,smoking, alcohol intake,multivitamin use, family history ofCRC, BMI, PA, EI,metabolic condition

CRC, RC, CC

8

Barrubes 2020 (PREDIMED) [83]

Spain

7,216

55–80

Men and women

FFQ

Quartiles

6.0

Age, sex, intervention group, smoking, family history of cancer,education, history of diabetes, EI,aspirin use, weight, PA, plant food intake, fast food and processed food intake, sugar-sweetened beverage intake, alcohol

CRC

6

O’Sullivan 2020 (ATP) [84]

Canada

26,460

50.9

Men and women

Diet history questionnaire

Tertiles

13.2

Age, sex, BMI, fruit and vegetable intake,alcohol, PA, smoking,ethnicity, household income, education,family history of CRC, red or processed meat intake

CRC

7

Mejborn 2020 (DNSDPA) [85]

Denmark

6,282

54.0

Men and women

7-day pre-coded food diaries

Tertiles

10.8

Sex, education,ethnicity, smoking,PA,alcohol, BMI,EI

CRC

6

Zhang 2020 (PLCO) [86]

USA

95,962

55–74

Men and women

Diet history questionnaire

Tertiles

8.9

Age, sex, race, education, smoking, aspirin use, history of diabetes, family history of PC, EI,PA, weight, diet rich in whole grains,vegetables, fruit, and beans, ultra-processed food intake, sugar-sweetened drink intake,alcohol, breastfeeding

PC

9

Knuppel 2020 (UK Biobank) [87,88,89,90]

UK

474,996

37–73

Men and women

FFQ

Quintiles

6.9

Age, region, ethnicity, deprivation,qualification, employment, living with spouse/partner, height, smoking, PA, alcohol, fruit and vegetable intake, cereal fiber intake, cheese intake,milk added to tea/coffee/cereal, oily fish intake, non-oily fish intake, menopausal status, parity, HRT, OC use

EC, GC, CRC, CC, RC, HCC, PC

8

Collatuzzo 2022 (GCS) [91]

Iran

50,045

40–75

Men and women

FFQ

Quintiles

12.0

Age, sex, BMI, ethnicity, place of residence, education and hot tea consumption

PC, EC, GC

7

  1. *AHS Adventist Health Study, ATBC Alpha-Tocopherol, Beta-Carotene Cancer Prevention Study, ATP Alberta’s Tomorrow Project, BCDDP Breast Cancer Detection Demonstration Project, BMI Body mass index, CC Colon cancer, CKB China Kadoorie Biobank, CNBSS Canadian National BreastScreening Study, CRC Colorectal cancer, CSEC CancerScreening Examination Cohort of the National Cancer Centerof Korea, EI Energy intake, EPIC European Prospective Investigation into Cancerand Nutrition, FFQ Food-frequency questionnaire, GC Gastric cancer, GCS Golestan Cohort Study, HPFS Health Professionals Follow Up Study, HRT Hormone replacement therapy, IWHS Iowa Women’s Health Study, JAH Japanese Ancestry in Hawaii, JRH Japanese residents of Hawaii, LSS Life Span Study, MCCS Melbourne Collaborative Cohort Study, MEC Multiethnic Cohort Study, NHS Nurses’ Health Study, NIH-AARP National Institutes of Health-American Association for Retired Persons, NLCS Netherlands Cohort Study, NSS NutriNet-Sante Study, NYUWHS New York University Women’s Health Study, PA Physical activity, PC Pancreatic cancer, PLCO Prostate, Lung, Colorectal, and Ovarian Cancer Screening Trial, PREDIMED Spanish PREvencion con DIeta MEDiterranea, RC Rectal cancer, SCHS  Singapore Chinese Health Study, SMC Swedish Mammography Cohort, STR Swedish Twin Registry, SWHS Shanghai Women’s Health Study, UKWCS UK Women’s Cohort Study, VITAL VITamins And Lifestyle, WHS Women’s Health Study