Journal of Dental Hygiene Science

Table 3

General Characteristics of the Included Studies

Characteristic	Category	Value
Year	≤2010	3 (14.3)
	2011∼2015	7 (33.3)
	2016∼2020	11 (52.4)
Sample size	≤49	7 (33.3)
	50∼99	11 (52.4)
	100∼149	3 (14.3)
Sex	Male & Female	17 (81.0)
	Female	2 (9.5)
	NR	2 (9.5)
Study design	NCGPPD	16 (76.2)
	OPPD	4 (19.0)
	RCGPPD	1 (4.8)

Values are presented as number (%).

NR: not report, NCGPPD: non-equivalent control group pretest- osttest design, OPPD: one group pretest-posttest design, RCGPPD: randomized control group pretest-posttest design.

J Dent Hyg Sci 2021;21:199-212 https://doi.org/10.17135/jdhs.2021.21.4.199