Figure 1.

Reported prevalence of gestational diabetes mellitus (GDM) across the 5‐year periods from 1 January 1981 to 31 December 2010 (dataset reference: IR2012‐01211; n = 1,776,845), from 1 January 2011 to 31 December 2011 (dataset reference: IR2013‐02036; n = 57,018) and from 1 January 2012 to 31 December 2012 (dataset reference: IR2015‐00505_macrosomia; n = 57,234) based on data submitted to the Information Services Division of NHS National Services Scotland from Scottish Maternity Hospitals. The vertical bars represent standard errors for each point estimate of GDM prevalence. The arrows illustrate the introduction of the Scottish Intercollegiate Network Guidelines SIGN 55 and 116 ‘Management of Diabetes’ guidelines. The χ²‐test for trend (1) = 2,987.8; P < 0.001.