Table 2. Characteristics of the study population.

BMI: body mass index; SD: standard deviation

Table 2 compares the onlay population group with the sublay population group with respect to age, sex, and BMI.

Study	Onlay group			Sublay group
	Age (years) Mean ± SD	Male/ Female	BMI (kg/m2) Mean ± SD	Age (years) Mean ± SD	Male/ Female	BMI (kg/m2) Mean ± SD
Venclauskas et al. [8]	56.9 ± 11.5	22/35	30.5 ± 7.4	53 ± 11.6	23/27	28 ± 6
Demetrashvili et al. [10]	61.2 ± 16.7	32/46	28.8 ± 3.9	59.6 ± 13.1	36/41	29.4 ± 4.7
Sevinc et al. [11]	55.9 ± 11.8	22/28	25.5 ± 3.5	55.9 ± 12.1	14/28	26.4 ± 3.3
Ahmed et al. [12]	Not recorded	20/13	Not recorded	Not recorded	22/10	Not recorded
Kumar et al. [13]	Not recorded	32/18	Not recorded	Not recorded	29/21	Not recorded