Table 1 Characteristics of the RCTs (randomized controlled trials) included in the meta-analysis
From: The effects of vitamin and mineral supplementation on women with gestational diabetes mellitus
First author, year | agent | Sample size | Dose, frequency | Time, weeks | Country | Phase | |
|---|---|---|---|---|---|---|---|
Jamilian 2019 [26] | Magnesium-zinc-calcium-vitamin D | 60 | 100 mg magnesium, 4 mg zinc, 400 mg calcium plus 200 IU vitamin D supplements twice a day | 6 | IRCT201704225623N109 | Iran | 3 |
ostadmohammadi 2019 [27] | zinc and vitamin E | 60 | 233 mg/day zinc gluconate plus 400 IU/day vitamin E supplements | 6 | IRCT20170513033941N26 | Iran | 3 |
maktabi 2018 [28] | magnesium and vitamin E | 60 | 250 mg/day magnesium oxide plus 400 IU/day vitamin E supplements | 6 | IRCT20170513033941N24 | Iran | 3 |
karamali 2018 [29] | Magnesium-zinc-calcium-vitamin D | 60 | 100 mg magnesium, 4 mg zinc, 400 mg calcium plus 200 IU vitamin D supplements twice a day | 6 | – | Iran | – |
jamilian 2017 [30] | Magnesium | 40 | 250 mg/day of magnesium supplements | 6 | IRCT201704235623N111 | Iran | 3 |
razavi 2017 [23] | vitamin D | 60 | 50,000 IU vitamin D every 2 weeks | 6 | IRCT201701305623N106 | Iran | 3 |
karamali 2016 [31] | zinc | 50 | 233 mg zinc gluconate (containing 30 mg zinc) | 6 | IRCT201503055623N42 | Iran | – |
karamali 2015 [32] | zinc | 58 | 233 mg zinc gluconate (containing 30 mg zinc) per day | 6 | IRCT201408295623N26 | Iran | 3 |
asemi 2015–1 [20] | selenium | 70 | 200 μg selenium supplements/day | 6 | IRCT201403175623N18 | Iran | 2 |
asemi 2015–2 [33] | magnesium | 70 | 250 mg magnesium supplements/day | 6 | IRCT201503055623N39 | Iran | 2 |
asemi 2014 [24] | Calcium plus vitamin D | 56 | 1000 mg calcium carbonate per day plus 50,000 IU vitamin D3 every 3 weeks | 6 | IRCT201311205623N11 | Iran | 2 |
asemi 2013 [18] | Vitamin D | 54 | 50,000 IU vitamin D3 every 3 weeks | 6 | IRCT201305115623N7 | Iran | 2 |