What do systematic reviews say?

Tight vs moderate glycaemic control (maternal outcomes)

It is very uncertain whether tight changes caesarean section compared with moderate glycaemic control (maternal outcomes) (very low certainty).

• Different intensities of glycaemic control for pregnant women with pre‐existing diabetes 2016 · Cochrane Headline outcomes only
  RR 1.21 [0.22, 6.5]
  1 study · 45 participants
  Very low

Very tight vs tight‐moderate glycaemic control (infant outcomes)

It is very uncertain whether very tight changes caesarean section compared with tight‐moderate glycaemic control (maternal outcomes) (very low certainty).

• Different intensities of glycaemic control for pregnant women with pre‐existing diabetes 2016 · Cochrane Headline outcomes only
  RR 0.92 [0.49, 1.73]
  1 study · 22 participants
  Very low

Intensity of glycaemic control for women with gestational diabetes mellitus ‐ strict glycaemic targets vs less‐tight glycaemic targets (maternal outcomes)

• Different intensities of glycaemic control for women with gestational diabetes mellitus 2023 · Cochrane Headline outcomes only
  0.98 [0.82, 1.17]
  3 studies · 1662 participants
  Moderate

Tight‐moderate vs less‐tight glycaemic targets (maternal outcomes)

Tight‐moderate may leads to lower caesarean section compared with loose glycaemic control (maternal outcomes) (low certainty).

• Different intensities of glycaemic control for pregnant women with pre‐existing diabetes 2016 · Cochrane Headline outcomes only
  RR 0.28 [0.1, 0.78]
  1 study · 60 participants
  Low