3. Summary of characteristics of studies in comparisons 5 and 6: add‐on/feedback device.

Study ID	Total n	Study duration (weeks)	Age	Country	Intervention	Control	Inhaler technique measure	Outcomes
Al‐Showair 2007	108	6	Adults	UK	Verbal training + 2Tone trainer; delivered to participant	Verbal training alone	PIF	PIF, FEV1, AQLQ
Ammari 2013	56	6	Adults and children (4 to 55 years)	UK	Verbal training + 2Tone trainer; delivered to participant	Verbal training alone	PIF	PIF, FEV1, AQLQ/PAQLQ
Ammari 2015	80	12	Children	UK	AeroChamber Plus with Flo‐Vu; delivered to participant	AeroChamber Plus alone	PIF	PIF, PAQLQ, ACQ, parent spacer preference
Ammari 2015a	30	6 to 8	Children	Not reported	Verbal training and use of Trainhaler; delivered to participant	Verbal training alone	PIF	PIF, ACQ
Rahmati 2014	90	4	Adults	Iran	Face‐to‐face training (with spacer device); delivered to participant	Usual care (no training)	11‐Step MDI checklist	Inhaler technique, PEFR
Schultz 2012	132	52	Children	Australia	Funhaler incentive device; delivered to participant	AeroChamber device	Filter used to measure salbutamol deposition	Inhaler technique, asthma control, quality of life
Tarsin 2008	76	4	Not reported	Libya	Verbal training + 2Tone trainer; delivered to participant	Verbal training alone	PIF	PIF, FEV1, AQLQ, Jones Morbidity Index (JMI)
Toumas‐Shehata 2014	19 pharmacists (101 participants)	4	Adults	Australia	Verbal training + quantitative inhaler feedback; delivered to pharmacist	Verbal training alone	Inhaler checklist/proportion with correct technique	Inhaler technique, ACQ
Vitari 2013	43	4	Not reported	USA	Face‐to‐face demonstration + In‐Check simulator; delivered to participant	Face‐to‐face demonstration	PIF, inhaler checklist	PIF, inhaler technique

ACQ: Asthma Control Questionnaire; AQLQ: Asthma Quality of Life Questionnaire; FEV₁: forced expiratory volume in one second; MDI: metered dose inhaler; PAQLQ: paediatric AQLQ; PEFR: peak expiratory flow rate; PIF: peak inspiratory flow