Findings

What do systematic reviews say?

948 questions · 998 findings · 100 reviews · Headline outcomes only

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No studies found 233 · 23.3%GRADE not reported 40 · 4%Very low 203 · 20.3%Low 271 · 27.2%Moderate 176 · 17.6%High 75 · 7.5%

Intramuscular vitamin K vs intravenous vitamin K

Necrotizing enterocolitis: 0.2 mg IV versus 0.5 mg IM · preterm infants

Intramuscular vitamin K showed no clear difference in necrotizing enterocolitis: 0.2 mg IV versus 0.5 mg IM compared with intravenous vitamin K (low certainty).

1 finding from 1 review

Prophylactic vitamin K for the prevention of vitamin K deficiency bleeding in preterm neonates 2018 · Cochrane Headline outcomes only
RR 1.08 [0.16, 7.1]
1 study · 54 participants
Low

Intramuscular vitamin K vs intravenous vitamin K

Sepsis: 0.2 mg IV versus 0.2 mg IM · preterm infants

Intramuscular vitamin K showed no clear difference in sepsis: 0.2 mg IV versus 0.2 mg IM compared with intravenous vitamin K (low certainty).

1 finding from 1 review

Prophylactic vitamin K for the prevention of vitamin K deficiency bleeding in preterm neonates 2018 · Cochrane Headline outcomes only
RR 1 [0.28, 3.58]
1 study · 52 participants
Low

Intramuscular vitamin K vs intravenous vitamin K

Sepsis diagnosed after randomisation: range 28 d to 60 d · preterm infants

Intramuscular vitamin K showed no clear difference in sepsis: 0.2 mg IV versus 0.5 mg IM compared with intravenous vitamin K (low certainty).

1 finding from 1 review

Prophylactic vitamin K for the prevention of vitamin K deficiency bleeding in preterm neonates 2018 · Cochrane Headline outcomes only
RR 0.86 [0.26, 2.86]
1 study · 54 participants
Low

Intramuscular vitamin K vs intravenous vitamin K

Mortality (all infants): 0.2 mg IV versus 0.2 mg IM · preterm infants

Intramuscular vitamin K showed no clear difference in mortality (all infants): 0.2 mg IV versus 0.2 mg IM compared with intravenous vitamin K (low certainty).

1 finding from 1 review

Prophylactic vitamin K for the prevention of vitamin K deficiency bleeding in preterm neonates 2018 · Cochrane Headline outcomes only
RR 1.32 [0.56, 3.14]
1 study · 67 participants
Low

Intramuscular vitamin K vs intravenous vitamin K

Mortality (all infants): 0.2 mg IV versus 0.5 mg IM · preterm infants

Intramuscular vitamin K showed no clear difference in mortality (all infants): 0.2 mg IV versus 0.5 mg IM compared with intravenous vitamin K (low certainty).

1 finding from 1 review

Prophylactic vitamin K for the prevention of vitamin K deficiency bleeding in preterm neonates 2018 · Cochrane Headline outcomes only
RR 2.82 [0.84, 9.46]
1 study · 64 participants
Low

Intramuscular vitamin K vs intravenous vitamin K

Bleeding complications: 0.2 mg IV versus 0.5 mg IM · preterm infants

Intramuscular vitamin K showed no clear difference in bleeding complications: 0.2 mg IV versus 0.5 mg IM compared with intravenous vitamin K (low certainty).

1 finding from 1 review

Prophylactic vitamin K for the prevention of vitamin K deficiency bleeding in preterm neonates 2018 · Cochrane Headline outcomes only
RR 0.81 [0.2, 3.27]
1 study · 54 participants
Low

Intramuscular vitamin K vs intravenous vitamin K

Intraventricular hemorrhage > Grade II: 0.2 mg IV versus 0.2 mg IM · preterm infants

Intramuscular vitamin K showed no clear difference in intraventricular hemorrhage > Grade II: 0.2 mg IV versus 0.2 mg IM compared with intravenous vitamin K (low certainty).

1 finding from 1 review

Prophylactic vitamin K for the prevention of vitamin K deficiency bleeding in preterm neonates 2018 · Cochrane Headline outcomes only
RR 2 [0.19, 20.72]
1 study · 52 participants
Low

Intramuscular vitamin K vs intravenous vitamin K

Intraventricular hemorrhage > Grade II: 0.2 mg IV versus 0.5 mg IM · preterm infants

Intramuscular vitamin K showed no clear difference in intraventricular hemorrhage > Grade II: 0.2 mg IV versus 0.5 mg IM compared with intravenous vitamin K (low certainty).

1 finding from 1 review

Prophylactic vitamin K for the prevention of vitamin K deficiency bleeding in preterm neonates 2018 · Cochrane Headline outcomes only
RR 0.72 [0.13, 3.96]
1 study · 54 participants
Low

Intramuscular vitamin K vs intravenous vitamin K

Presence of PIVKA II at day 5: 0.2 mg IV versus 0.2 mg IM · preterm infants

Intramuscular vitamin K showed no clear difference in presence of PIVKA II at day 5: 0.2 mg IV versus 0.2 mg IM compared with intravenous vitamin K (low certainty).

1 finding from 1 review

Prophylactic vitamin K for the prevention of vitamin K deficiency bleeding in preterm neonates 2018 · Cochrane Headline outcomes only
RR 1.52 [0.37, 6.23]
1 study · 60 participants
Low

Intramuscular vitamin K vs intravenous vitamin K

Presence of PIVKA II at day 5: 0.2 mg IV versus 0.5 mg IM · preterm infants

Intramuscular vitamin K showed no clear difference in presence of PIVKA II at day 5: 0.2 mg IV versus 0.5 mg IM compared with intravenous vitamin K (low certainty).

1 finding from 1 review

Prophylactic vitamin K for the prevention of vitamin K deficiency bleeding in preterm neonates 2018 · Cochrane Headline outcomes only
RR 2.07 [0.41, 10.43]
1 study · 57 participants
Low

Intramuscular vitamin K vs intravenous vitamin K

Presence of PIVKA II at day 25: 0.2 mg IV versus 0.2 mg IM · preterm infants

Intramuscular vitamin K showed no clear difference in presence of PIVKA II at day 25: 0.2 mg IV versus 0.2 mg IM compared with intravenous vitamin K (low certainty).

1 finding from 1 review

Prophylactic vitamin K for the prevention of vitamin K deficiency bleeding in preterm neonates 2018 · Cochrane Headline outcomes only
RR 1.08 [0.07, 16.36]
1 study · 52 participants
Low

Intramuscular vitamin K vs intravenous vitamin K

Presence of PIVKA II at day 25 ‐ 0.2 mg IV versus 0.5 mg IM · preterm infants

Intramuscular vitamin K showed no clear difference in presence of PIVKA II at day 25 ‐ 0.2 mg IV versus 0.5 mg IM compared with intravenous vitamin K (low certainty).

1 finding from 1 review

Prophylactic vitamin K for the prevention of vitamin K deficiency bleeding in preterm neonates 2018 · Cochrane Headline outcomes only
RR 1.04 [0.07, 15.74]
1 study · 51 participants
Low

Intramuscular vitamin K vs intravenous vitamin K

Necrotizing enterocolitis ‐ 0.2 mg IV versus 0.2 mg IM · preterm infants

Intramuscular vitamin K showed no clear difference in necrotizing enterocolitis ‐ 0.2 mg IV versus 0.2 mg IM compared with intravenous vitamin K (low certainty).

1 finding from 1 review

Prophylactic vitamin K for the prevention of vitamin K deficiency bleeding in preterm neonates 2018 · Cochrane Headline outcomes only
RR 1 [0.15, 6.57]
1 study · 52 participants
Low

Vitamin D vs control

Mean serum vitamin D concentrations · children under 5 years of age

1 finding from 1 review

Vitamin D supplementation for preventing infections in children under five years of age 2016 · Cochrane Headline outcomes only
no estimate extracted
4 studies · 266 participants
Low

Vitamin D given to infants vs placebo or no treatment

Vitamin D insufficiency: 25‐OH vitamin D < 50 nmol/L · term breastfed infants to prevent vitamin D deficiency and improve bone health

Vitamin D given to infants may leads to lower vitamin D insufficiency: 25‐OH vitamin D < 50 nmol/L compared with placebo or no treatment (low certainty).

1 finding from 1 review

Vitamin D supplementation for term breastfed infants to prevent vitamin D deficiency and improve bone health 2020 · Cochrane Headline outcomes only
RR 0.57 [0.41, 0.8]
4 studies · 274 participants
Low

Vitamin D given to infants vs placebo or no treatment

Vitamin D deficiency: 25‐OH vitamin D < 30 nmol/L · term breastfed infants to prevent vitamin D deficiency and improve bone health

It is very uncertain whether vitamin D given to infants changes vitamin D deficiency: 25‐OH vitamin D < 30 nmol/L compared with placebo or no treatment (very low certainty).

1 finding from 1 review

Vitamin D supplementation for term breastfed infants to prevent vitamin D deficiency and improve bone health 2020 · Cochrane Headline outcomes only
RR 0.41 [0.16, 1.05]
2 studies · 122 participants
Very low

Vitamin D given to infants vs placebo or no treatment

Serum 25‐OH vitamin D level at latest time reported nmol/L · term breastfed infants to prevent vitamin D deficiency and improve bone health

1 finding from 1 review

Vitamin D supplementation for term breastfed infants to prevent vitamin D deficiency and improve bone health 2020 · Cochrane Headline outcomes only
no estimate extracted
7 studies · 356 participants
Low

Vitamin D given to lactating mothers vs placebo or no treatment

Serum 25‐OH vitamin D level at latest time reported nmol/L · term breastfed infants to prevent vitamin D deficiency and improve bone health

1 finding from 1 review

Vitamin D supplementation for term breastfed infants to prevent vitamin D deficiency and improve bone health 2020 · Cochrane Headline outcomes only
no estimate extracted
7 studies · 597 participants
Low

Vitamin D given to lactating mothers vs placebo or no treatment

Vitamin D insufficiency: 25‐OH vitamin D < 50 nmol/L · term breastfed infants to prevent vitamin D deficiency and improve bone health

Vitamin D given to lactating mothers may leads to lower vitamin D insufficiency: 25‐OH vitamin D < 50 nmol/L compared with placebo or no treatment (low certainty).

1 finding from 1 review

Vitamin D supplementation for term breastfed infants to prevent vitamin D deficiency and improve bone health 2020 · Cochrane Headline outcomes only
RR 0.47 [0.39, 0.57]
5 studies · 512 participants
Low

Vitamin D given to lactating mothers vs placebo or no treatment

Vitamin D deficiency: 25‐OH vitamin D < 30 nmol/L · term breastfed infants to prevent vitamin D deficiency and improve bone health

Vitamin D given to lactating mothers may leads to lower vitamin D deficiency: 25‐OH vitamin D < 30 nmol/L compared with placebo or no treatment (low certainty).

1 finding from 1 review

Vitamin D supplementation for term breastfed infants to prevent vitamin D deficiency and improve bone health 2020 · Cochrane Headline outcomes only
RR 0.15 [0.09, 0.24]
5 studies · 512 participants
Low