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Table 2 Characteristics of the included studies

From: Hidden analyses: a review of reporting practice and recommendations for more transparent reporting of initial data analyses

Study

Journal

Location

Years of participant selectiona

Study sizea

Data sourcea

Inohara et al. [8]

JAMA

USA

2013–2016

141,311

Stroke registry

Purnell et al. [9]

JAMA

USA

1995–2014

453,162

Transplant registry

Reges et al. [10]

JAMA

Israel

2005–2015

33,540

Multiple hospitals

Snyder et al. [11]

JAMA

USA

2006–2007

8529

Cancer registry

Yu et al. [12]

JAMA

China

2004–2008

271,217

Nationwide Biobank

Biccard et al. [13]

Lancet

25 African countries

2016

11,422

Multiple hospitals

Wood et al. [14]

Lancet

19 high income countries

1964–2010

599,912

Multiple CVD registries and a biobank

Dziadzko et al. [15]

Lancet

USA

2000–2010

1294

Single hospital and a medical registry of area residents

Zylbersztejn et al. [16]

Lancet

UK, Sweden

2003–2013

4,946,246

Hospital episode registries, birth and death registries

Gilbert et al. [17]

Lancet

UK

2013–2015

22,139

Hospital episode registry; death registry

Alexander et al. [18]

Circulation

Australia

1987–1996

80

Childhood cardio-myopathy registry

Nazerian et al. [19]

Circulation

Brazil, Germany, Italy, Switzerland

2014–2016

1850

Multiple hospitals

Pollack et al. [20]

Circulation

USA, Canada

2011–2015

2500

Resuscitation outcomes registry

Puelacher et al. [21]

Circulation

Switzerland

2014–2015

2018

Single hospital

Chao et al. [22]

Circulation

Taiwan

1996–2015

32,160

Health Insurance database

Chow et al. [23]

JCO

USA

1962–2001

13,060

Multiple hospitals

Kenzik et al. [24]

JCO

USA

2000–2011

72,408

Cancer registry and Health insurance database

Degnim et al. [25]

JCO

USA

1967–2001

669

Single hospital

Gundle et al. [26]

JCO

USA

1989–2014

2217

Single hospital

Clarke et al. [27]

JCO

USA

2003–2015

944,227

Multiple hospitals

Hoen et al. [28]

NEJM

French territories in the Americas

2016

555

ZIKV pregnancy population cohort

Amarenco et al. [29]

NEJM

Europe, Asia, Latin America

2009–2011

3356

Stroke registry

Calderon et al. [30]

NEJM

Israel

1980–2014

1,522,731

Renal registry and population cohort

Kyle et al. [31]

NEJM

USA

1960–1994

1384

Single hospital

Mead et al. [32]

NEJM

USA

2016–2017

184

ZIKV male population cohort

  1. aOnly the development sample size (i.e not the validation sample size) was included here or the population of main interest for the analysis (i.e. not matched populations)