Table 5: Quality assessment of studies included according to the Jadad scale.

Reference⁢Quality assessment of methodology based on Jadad scale
RandomizationAppropriate method of randomization and description⁢BlindingDescription of dropouts/withdrawalsJadad score (score out of 5)
No blindingSingle blindDouble blindAppropriate method of double blinding and description

Inhalation aromatherapy
[18]YesYesNoNoYesYesNo4
[19]YesNoYesNoNoNAYes2
[20]YesYesYesNoNoNAYes3
[21]YesNoNoYesNoNoNo1
[22]YesYesNoNoYesNoYes4

Aromatherapy massage
[23]YesNoYesNoNoNANo1
[24]YesYesNoNoYesYesYes5
[25]YesYesNoNoYesNoYes3
[26]YesYesYesNoNoNANA2
[19]YesNoYesNoNoNAYes2
[27]YesYesNoYesNoNoYes3
[28]YesYesYesNoNoNoNo2
[29]YesNoYesNoNoNANo1

In this study, both aromatherapy modalities were tested, inhalation aromatherapy and aromatherapy massage. Therefore, the study was included in both categories in the table. NA, not applicable.