Participants were asked to demonstrate use of their prescribed DPI on Day 1 and any error made by the participant was recorded by the health care practitioner (HCP) in the checklist. Checklist of instructions for correct use were based on the steps for correct use listed in PILs for the respective DPI. The errors made during demonstration by participants were defined as "critical" when an error was most likely to result in no or significantly reduced medication being inhaled. Percentage values are rounded off.

Modified intention-to-treat (mITT) Population comprised of all participants who were randomized to study intervention in the study, completed reading of the PIL and attempted demonstration of both inhalers.

Participants were asked to demonstrate inhaler use after reading PIL. The errors made during demonstration by participants were defined as "critical" when an error was most likely to result in no or significantly reduced medication being inhaled. If the participant made any error according to the error checklists, the HCP provided instructions on the correct use of the inhaler to the participant and the participant was then asked to demonstrate the inhaler use again. Any error made by the participant were recorded by the HCP in the checklist. The same procedure was repeated if the participant continued to make errors in the use of the inhaler. In total, the HCP provided up to 3 instructions on the use of the inhaler. Same procedure was followed for second inhaler. Percentage of participants making at least one critical error after receiving 1st instruction, 2nd instruction and 3rd instruction from HCP were reported. Percentage values are rounded off.

Modified intention-to-treat (mITT) Population

Participants were asked to demonstrate use of their prescribed DPI on Day 1 and any error made by the participant was recorded by the HCP in the checklist. Checklist of instructions for correct use were based on the steps for correct use listed in PILs for the respective DPI. An overall error was any error in inhaler technique which includes a critical and non-critical error. Percentage values are rounded off.

Modified intention-to-treat (mITT) Population

Participants were asked to demonstrate inhaler use after reading PIL. If the participant made any error according to the error checklists, the HCP provided instructions on the correct use of the inhaler to the participant and the participant was then asked to demonstrate the inhaler use again. Any error made by the participant were recorded by the HCP in the checklist. The same procedure was repeated if the participant continued to make errors in the use of the inhaler. In total, the HCP provided up to 3 instructions on the use of the inhaler. Same procedure was followed for second inhaler. An overall error was any error in inhaler technique which includes a critical and non-critical error. Percentage of participants making at least one overall error after receiving 1st instruction, 2nd instruction and 3rd instruction from HCP were reported. Percentage values are rounded off.

Modified intention-to-treat (mITT) Population

Participants were asked to demonstrate inhaler use after reading PIL. If participant made any error according to error checklists, the HCP provided instructions on correct use of inhaler to participant and participant was then asked to demonstrate inhaler use again. Critical error was any error which most likely to result in no or significantly reduced medication being inhaled. An overall error was any error in inhaler technique, which includes a critical and non-critical. Any error made by the participant was recorded by the HCP in checklist. The same procedure was repeated if the participant continued to make errors in the use of inhaler. In total, HCP provided up to 3 time instructions on correct use of inhaler. Same procedure was followed for second inhaler. The number of critical and overall errors made by participants after reading PIL and after receiving 1st instruction, 2nd instruction and 3rd instruction from HCP were reported.

Modified intention-to-treat (mITT) Population

Participants were asked to demonstrate inhaler use after reading PIL. If the participant made any error according to the error checklists, the HCP provided instructions on the correct use of the inhaler to the participant and the participant was then asked to demonstrate the inhaler use again. Any error made by the participant were recorded by the HCP in the checklist. The same procedure was repeated if the participant continued to make errors in the use of the inhaler. In total, the HCP provided up to 3 times instructions on the correct use of inhaler. Same procedure was followed for second inhaler. Percentage of participants who required zero, 1st, 2nd and 3rd instruction from HCP to demonstrate correct inhaler use were reported. Percentage values are rounded off.

Modified intention-to-treat (mITT) Population

Participants were asked to demonstrate inhaler use after reading PIL and any error made by the participant was recorded by the HCP in the checklist. Time taken to demonstrate inhaler use after reading PIL without HCP intervention was the amount of time taken to correctly demonstrate inhaler use without HCP intervention. T1 was calculated from the start of inhaler demonstration by the participant after reading the PIL until completion of the first attempt.

Modified intention-to-treat (mITT) Population. Only those participants with data available at specified time points were analyzed.

Time taken by HCP to demonstrate the correct use of inhaler was the time from when the HCP started to instruct the participant until correct use was demonstrated. It includes the time used by the HCP for re-instructing the participants throughout. T2 was calculated from the first instruction provided by the HCP until demonstration of correct use. Up to 3 further attempts were made after completion of the first attempt.

Modified intention-to-treat (mITT) Population

Participants were asked to demonstrate inhaler use after reading PIL and any error made by the participant was recorded by the HCP in the checklist. Total time taken for demonstration of correct use after reading PIL was the time from when the participant started the demonstration until correct use is demonstrated (4 attempts= once after the reading the PIL and following instruction from investigator up to 3 times). T1+T2 was calculated from the start of inhaler demonstration after reading the PIL until correct demonstration was observed.

Modified intention-to-treat (mITT) Population

Participant were asked to complete the ease of use questionnaire for the DPI once error assessment of each inhaler was completed. This was a series of 6 questions (Ease of use rating, Telling how many doses were left in inhaler, Learning how to use inhaler, Handling the inhaler, Preparing inhaler and Holding inhaler while using it). Each question had one response to choose from 5 options of ease of use (Very easy, easy, neutral, difficult and very difficult). Participants were asked to rate based on their ease of use experience with device using a scale ranging from 1 (very easy) to 5 (very difficult). A higher rating indicated that the inhaler was difficult to use and a lower rating indicated that inhaler was easier to use. This questionnaire was completed for the first device before moving to the critical errors assessment of the second device. Data has been categorized and reported as 'Very easy', 'Easy', 'Neutral', 'Difficult' and 'Very Difficult' with respect to each question.

Modified intention-to-treat (mITT) Population

The ease-of-use questionnaire consists of a series of 6 questions (Ease of use rating, Telling how many doses were left in inhaler, Learning how to use inhaler, Handling inhaler, Preparing inhaler and Holding inhaler while using it). Each question had one response to choose from 5 options of ease of use(Very easy, easy, neutral, difficult and very difficult). Participants were asked to rate based on their ease of use experience with device using a scale ranging from 1(very easy) to 5(very difficult). A higher rating indicated that inhaler was difficult to use and a lower rating indicated that inhaler was easy to use. This questionnaire was completed for first device before moving to critical errors assessment of second device. Participant who responded Very Easy or Easy was considered Easy and participant who responded Neutral, Difficult or Very Difficult was considered Difficult. Data has been categorized and reported as Easy and Difficult with respect to each question

Modified intention-to-treat (mITT) Population

Participants were asked the question regarding their willingness to continue with the inhaler using a visual analogue scale ranging from 0 (not willing) to 100 (definitely willing) after completion of the critical errors assessment for each inhaler and the ease of use questionnaire for that inhaler. Participants marked on the VAS scale, how willing they were to continue using the inhaler. That mark was measured with a ruler to determine the numerical score. It ranges from 0 to 100 where, higher score on the scale indicates better outcome, means participant was definitely willing to continue using the inhaler.

Modified intention-to-treat (mITT) Population

Participants were asked to complete the assigned preference questionnaires after completing the errors in use assessment for both devices. Participants were asked to provide their responses in terms of their preference to the ELLIPTA inhaler or BREEZHALER inhaler or No preference. Participants preference was assessed using series of 7 questions (Preferred inhaler-overall, Preference based on the number of steps to take the medication, Preference based on the time needed to take the medication, Preference based on how easy the inhaler was to use, Preference based on the size of the inhaler, Preference based on the comfort of the mouthpiece and Preference based on the ease of opening the inhaler). Participants had to choose one response from 3 preference options (ELLIPTA inhaler or BREEZHALER inhaler or No preference).

Modified intention-to-treat (mITT) Population. Data has been presented for All treated participants in a single arm as the intent of this endpoint was to assess the participant's preference to the inhaler (among both the inhalers) that was used.