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Table 1 Baseline characteristics of qualified studies in this meta-analysis

From: No association between the progesterone receptor gene polymorphism (+331G/a) and the risk of breast cancer: an updated meta-analysis

Author

Year

Country

Ethnicity

Controls source

Mean age of control group

Cases, n

Controls, n

De Vivo

2003

America

Caucasian

hospital-based

57.2

990

1364

Diergaarde

2008

America

Caucasian

population-based

323

650

Feigelson

2004

America

Caucasian

population-based

62

479

494

Fernandez

2006

Spain

Caucasian

population-based

544

553

Huggins

2006

America

Caucasian

hospital-based

1298

1728

Jin

2008

China

Han

population-based

48.67

206

214

Johnatty

2008

Australia

Caucasian

population-based

1443

530

Kotsopoulos

2009

America

Caucasian

hospital-based

1664

2391

Pearce

2005

America

Caucasian

population-based

1674

2432

Pooley

2006

Norfolk

Caucasian

population-based

2187

2269

Reding

2009

America

mixed race

population-based

1264

1021

Romano

2005

Netherlands

Caucasian

population-based

64.8

535

379

Romano

2007

Netherlands

Caucasian

hospital-based

169

31