The "Booklet of Scripts for Doctors" was used in the control arm. This tool was developed and tested to encourage shared decision-making in prescribing antidepressants within the Malaysian context.

The patient version of the Shared Decision Making scale (SDM-Q-9) measures the extent to which patients are involved in the decision-making process from the patient's perspective. It consists of nine items rated on a six-point Likert-type scale from"completely disagree=" to"completely agree=". Adding the score of all the items leads to a raw total between 0 and 45. Multiplying the raw score by 20/9 provides a transformed score ranging from 0 to 100, higher scores indicate a greater extent of SDM.

The physician version of Shared Decision Making scale (SDM-Q-Doc) measures the extent to which patients are involved in the decision-making process from the physician's perspective. It consists of nine items rated on a six-point Likert-type scale from"completely disagree=" to"completely agree=". Adding the score of all the items leads to a raw total between 0 and 45. Multiplying the raw score by 20/9 provided a transformed score ranging from 0 to 100, higher scores indicate a greater extent of SDM.

The patient version of the Preparation for Decision-Making Scale (PDMS) assesses the patient's perception of how the PDA helped them recognize that a decision needs to be made, preparing them to communicate with their practitioner and promote patient involvement in the decision-making process. Higher scores indicate a higher perceived level of preparation for decision making.

The physician version of the Preparation for Decision-Making Scale (PDMS) assesses the physician's perception of how the PDA helped patients recognize that a decision needs to be made, preparing them to communicate with their practitioner and promote patient involvement in the decision-making process. Higher scores indicate a higher perceived level of preparation for decision making.