Table 3.

Prevalence of GDM in different locations in the UK and using different diagnostic criteria

First author	Publication year	Location	GDM diagnostic criteria	Number of women included	Number with GDM	Prevalence of GDM (%)
Ali et al50	2013	Dublin	NDDG	1,375	139	10.1
		Dublin	IADPSG	1,679	221	13.2
Dornhorst et al51	1992	London (St Mary’s)	Reported in papera	11,035	170	1.5
Gregory et al40	1998	Cambridge	WHO 1980	3,316	67	2.0
Griffin et al52	2000	Dublin	NDDG	1,299	35	2.7
Janghorbani et al53	2006	Plymouth	WHO 1980	4,942	90	1.8
Khalifeh et al54	2014	Dublin	WHO 1999	68,494	888	1.2
		Dublin	WHO 1999	112,138	2,016	1.8
Koukkou et al55	1995	London (St Thomas’)	EASDb	6,887	136	2.0
Makgoba et al56	2012	London (St Mary’s)	Variedc	174,320	1,688	1.0
Sacks et al57	2012	Manchester	IADPSG	2,376	577	24.3
		Belfast	IADPSG	1,671	286	17.1
Samanta et al58	1989	Leicester	WHO 1980	12,005	128	1.1

Notes: WHO either 1980 or 1999 criteria depending on year data were generated.

^aAll women without preexisting diabetes screened at booking and then those with risk factors were rescreened using modified O’Sullivan screening test, which was a 50 g OGCT followed by OGTT if level >7.8 mmol/L; GDM was diagnosed with 3-hour 100 g OGTT if AUC ≥4.3 units.

^bEASD criteria and 75 g OGTT used, GDM diagnosed if 2-hour >9 mmol/L.

^cOnly primiparous women included. No “common” screening test was used, as pregnancies were included from 1998 and 2000 and different criteria could have been used.

Abbreviations: EASD, European Association for the Study of Diabetes; GDM, gestational diabetes mellitus; IADPSG, International Association of Diabetes in Pregnancy study Groups; NDDG, National Diabetes Data Group; OGTT, oral glucose tolerance test; WHO, World Health Organization.