A dose of vitamin D 601 IU or higher showed no clear difference in pre‐eclampsia compared with 600 IU or lower alone or with other nutrients (low certainty).
A dose of vitamin D 601 IU or higher probably leads to lower gestational diabetes compared with 600 IU or lower alone or with other nutrients (moderate certainty).
A dose of vitamin D 601 IU or higher showed no clear difference in preterm birth compared with 600 IU or lower alone or with other nutrients (low certainty).
It is very uncertain whether A dose of vitamin D 601 IU or higher changes low birthweight compared with 600 IU or lower alone or with other nutrients (very low certainty).
Summary of findings table ‐ Vitamin D showed no clear difference in proportion of participants with one or more exacerbations treated… compared with placebo (high certainty).
Summary of findings table ‐ Vitamin D showed no clear difference in proportion of participants with one or more exacerbations requiring… compared with placebo (moderate certainty).
Summary of findings table ‐ Vitamin D showed no clear difference in proportion of participants with one or more serious adverse events… compared with placebo (high certainty).
Summary of findings table ‐ Vitamin D showed no clear difference in withdrawals from trial compared with placebo (high certainty).
The review found no eligible studies for this question.
Summary of Findings Table ‐ Vitamin D showed no clear difference in worsening of clinical status compared with placebo or standard care alone (low certainty).
The review found no eligible studies for this question.
It is very uncertain whether summary of Findings Table ‐ Vitamin D changes adverse events (any grade) compared with placebo or standard care alone (very low certainty).
The review found no eligible studies for this question.
A dose of vitamin D 4000 IU/d or more showed no clear difference in pre‐eclampsia compared with 3999 IU/d or less alone or with any other nutrient (low certainty).
A dose of vitamin D 4000 IU/d or more showed no clear difference in gestational diabetes compared with 3999 IU/d or less alone or with any other nutrient (low certainty).
A dose of vitamin D 4000 IU/d or more showed no clear difference in preterm birth compared with 3999 IU/d or less alone or with any other nutrient (low certainty).