What do systematic reviews say?

Staple foods fortified with vitamin A vs same unfortified staple foods

It is very uncertain whether staple foods fortified with vitamin A changes clinical vitamin A deficiency (defined as night blindness) compared with same unfortified staple foods (very low certainty).

• Fortification of staple foods with vitamin A for vitamin A deficiency 2019 · Cochrane Headline outcomes only
  RR 0.11 [0.01, 1.98]
  1 study · 581 participants
  Very low

Staple foods fortified with vitamin A vs same unfortified staple foods

The review found no eligible studies for this question.

• Fortification of staple foods with vitamin A for vitamin A deficiency 2019 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Staple foods fortified with vitamin A vs same unfortified staple foods

The review found no eligible studies for this question.

• Fortification of staple foods with vitamin A for vitamin A deficiency 2019 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Staple foods fortified with vitamin A vs same unfortified staple foods

The review found no eligible studies for this question.

• Fortification of staple foods with vitamin A for vitamin A deficiency 2019 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Staple food fortified with vitamin A plus other micronutrients vs same unfortified staple foods

• Fortification of staple foods with vitamin A for vitamin A deficiency 2019 · Cochrane Headline outcomes only
  no estimate extracted
  4 studies · 1009 participants
  Low

Staple food fortified with vitamin A plus other micronutrients vs same unfortified staple foods

Staple foods fortified with vitamin A plus other micronutrients probably leads to lower subclinical vitamin A deficiency (serum/plasma retinol 0.70 μmol/L… compared with same unfortified staple foods (moderate certainty).

• Fortification of staple foods with vitamin A for vitamin A deficiency 2019 · Cochrane Headline outcomes only
  RR 0.27 [0.16, 0.49]
  3 studies · 923 participants
  Moderate

Staple food fortified with vitamin A plus other micronutrients vs same unfortified staple foods

The review found no eligible studies for this question.

• Fortification of staple foods with vitamin A for vitamin A deficiency 2019 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Intervention not reported

The review found no eligible studies for this question.

• Iodine fortification of foods and condiments, other than salt, for preventing iodine deficiency disorders 2019 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Intervention not reported

The review found no eligible studies for this question.

• Iodine fortification of foods and condiments, other than salt, for preventing iodine deficiency disorders 2019 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Intervention not reported

The review found no eligible studies for this question.

• Iodine fortification of foods and condiments, other than salt, for preventing iodine deficiency disorders 2019 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Intervention not reported

The review found no eligible studies for this question.

• Iodine fortification of foods and condiments, other than salt, for preventing iodine deficiency disorders 2019 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Intervention not reported

The review found no eligible studies for this question.

• Iodine fortification of foods and condiments, other than salt, for preventing iodine deficiency disorders 2019 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Intervention not reported

• Iodine fortification of foods and condiments, other than salt, for preventing iodine deficiency disorders 2019 · Cochrane Headline outcomes only
  no estimate extracted
  1 study · 33 participants
  Low

Intervention not reported

• Iodine fortification of foods and condiments, other than salt, for preventing iodine deficiency disorders 2019 · Cochrane Headline outcomes only
  no estimate extracted
  6 studies · 2032 participants
  Moderate

Intervention not reported

• Iodine fortification of foods and condiments, other than salt, for preventing iodine deficiency disorders 2019 · Cochrane Headline outcomes only
  no estimate extracted
  262 participants
  Very low

Intervention not reported

The review found no eligible studies for this question.

• Iodine fortification of foods and condiments, other than salt, for preventing iodine deficiency disorders 2019 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Intervention not reported

The review found no eligible studies for this question.

• Iodine fortification of foods and condiments, other than salt, for preventing iodine deficiency disorders 2019 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Intervention not reported

• Iodine fortification of foods and condiments, other than salt, for preventing iodine deficiency disorders 2019 · Cochrane Headline outcomes only
  no estimate extracted
  1 study · 1 participants
  Very low

Intervention not reported

It is very uncertain whether the intervention changes goitre prevalence (non‐RCT) (very low certainty).

• Iodine fortification of foods and condiments, other than salt, for preventing iodine deficiency disorders 2019 · Cochrane Headline outcomes only
  OR 1.6 [0.6, 4.31]
  83 participants
  Very low

Intervention not reported

The review found no eligible studies for this question.

• Iodine fortification of foods and condiments, other than salt, for preventing iodine deficiency disorders 2019 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found