Table 2.

Demographic characteristics of the included studies.

Author (Year)	Design	Country	Patient status	Sample size (intervention/control)	Age (years) (intervention/control)	Gender	Duration (weeks)	Intervention/control (type and dosage)	Registered	Funding
Ebrahimi-Mamaghani et al. (24)	Rn/Pa	Iran	Type 2 diabetes	19/19	54.6/53.8	Both	8	13.75 mL/d ACV/−	Yes	Investigator-initiated
Mahmoodi et al. (29)	Db/Pa	Iran	Type 2 diabetes	30/30	NR	Both	4	15 mL/d ACV/water	Yes	NR
Halima et al. (26)	Db/Rn/Pa	Tunisia	Type 2 diabetes	24/20	NR	NR	4	15 mL/d ACV/water	Yes	NR
Mohammadpourhodki et al. (30)	Rn/Pa	Iran	Type 2 diabetes	38/38	49.2/49.2	Both	8	20 mL/d ACV/−	Yes	NR
Gheflati et al. (25)	Rn/Pa	Iran	Type 2 diabetes	32/30	49.47/52.1	Both	8	20 mL/d ACV/P	Yes	Investigator-initiated
Kausar et al. (28)	Sb/Rn/Pa	Pakistan	Type 2 diabetes	55/55	51.1/50.4	Both	12	15 mL/d ACV/P	Yes	Investigator-initiated
Jafarirad et al. (27)	Rn/Pa	Iran	Type 2 diabetes	37/36	53.11/52.94	Both	8	30 mL/d ACV + dietary recommendation/ dietary recommendation	Yes	Investigator-initiated

Apple Cider Vinegar; NR, Not Reported; Db, Double-blinded; Sb, Single-blinded; Rn, Randomized; Pa, Parallel; P, Placebo.