Scolaris Content Display Scolaris Content Display

Table 1. Quality of the included studies according to the NHS Centre 2001 table

Trials

Entry point

Confounding of cases

Confounding of controls

Follow‐up length

Dropouts < 10%

Data clear

Endpoints clear

Same population

Cooney 1996

+

Unclear

+

Unclear

+

Unclear

Díaz 1988a

Unclear

Unclear

+

+ Cases

+

Egbuonu 2005

+

+

+

+

+

Kazi 1995

+

+

+

+

+

Labbok 1997

+

+

+

+

Unclear

Peréz 1991

+

Unclear

Unclear

+

+ Cases

+

Ramos 1996

+

+

+

+

+

Ravera 1995

+

Unclear

+

Unclear

+

+

Rodríguez 1993

Unclear

+

+

+

Shaaban 2013

+

+

+

Unclear

+

WHO 1999a

+

Unclear

+

Unclear

+

+

LAM: lactational amenorrhoea method
WHO: World Health Organization

Figuras y tablas -
Table 1. Quality of the included studies according to the NHS Centre 2001 table