Table 4.

Types of scent.

N.	Types of scent		No. of Included Studies
1	Herb	Peppermint	(3, 18–24, 32, 33, 37)
		Rosemary	(19, 26, 30)
2	Citrus		(19, 27, 31, 34–37)
3	Flower	Lavender	(3, 25)
		Michelia	(16)
4	Wood		(15, 19, 38, 39)
5	Food		(40, 42)
6	Mixed fragrance		(28, 29, 41)