Summary of findings for the main comparison. 75 g OGTT versus 100 g OGTT for diagnosing GDM to improve maternal and infant health.

75 g oral glucose tolerance test (OGTT) versus 100 g OGTT for diagnosing gestational diabetes mellitus (GDM) to improve maternal and infant health
Patient or population: pregnant women at low or high risk of gestational diabetes Settings: 1 study, Nigeria Intervention: 75 g OGTT Comparison: 100 g OGTT
Outcomes	Illustrative comparative risks* (95% CI)		Relative effect (95% CI)	Number of participants (studies)	Quality of the evidence (GRADE)	Comments
	Assumed risk	Corresponding risk
	100 g OGTT	75 g OGTT
Diagnosis of gestational diabetes	Study population		RR 2.55 (0.96 to 6.75)	248 (1 study)	⊕⊝⊝⊝ Very lowa,b	Women who received the 75 g OGTT test were 2.55 times more likely to test positive for gestational diabetes.
	45 per 1000	116 per 1000 (44 to 307)
Caesarean section	See comment	See comment	Not estimable	0 (0)	See comment	None of the included studies reported this outcome.
Macrosomia > 4.5 kg or as defined in trial	See comment	See comment	Not estimable	0 (0)	See comment	None of the included studies reported this outcome.
Long‐term type 2 diabetes maternal	See comment	See comment	Not estimable	0 (0)	See comment	None of the included studies reported this outcome.
Long‐term type 2 diabetes infant	See comment	See comment	Not estimable	0 (0)	See comment	None of the included studies reported this outcome.
Economic costs	See comment	See comment	Not estimable	0 (0)	See comment	None of the included studies reported this outcome.
*The basis for the assumed risk (e.g. median control group risk across studies) is the risk. The corresponding risk (and its 95% confidence interval) is based on the assumed risk in the comparison group and the relative effect of the intervention (and its 95% CI). CI: Confidence interval; RR: Risk ratio.
GRADE Working Group grades of evidence. High quality: Further research is very unlikely to change our confidence in the estimate of effect. Moderate quality: Further research is likely to have an important impact on our confidence in the estimate of effect and may change the estimate. Low quality: Further research is very likely to have an important impact on our confidence in the estimate of effect and is likely to change the estimate. Very low quality: We are very uncertain about the estimate.

^aOne study with design limitations (‐1).
 ^bWide confidence intervals crossing the line of no effect, few events and small sample size.