Characteristics of studies included in the systematic review.

Abbreviations; HbA1c - glycated haemoglobin, NR—not reported, BG—blood sugar, Hypo–hypoglycaemia. a Mild/moderate hypoglycaemia—no third party assistance was needed b Severe hypoglycaemia—third party assistance was required. c Unspecified hypoglycaemia- severity not specified when gathering some or all of the hypoglycaemia data d Category for meta-analysis Characteristics of studies included in the systematic review.