Motivation and response rates in bronchoscopy studies

Table 4 Motives reported by the 245^a participants who gave motives in an observational research bronchoscopy study

Motives	n	Percentage
Primarily altruism ^b	165	67.3
Previous participation	23	9.4
Contribute to science	96	39.2
Help others	39	15.9
Give back (for previous participation)	7	2.9
Generally positive (to examination or participation and “yes-human”)	6	2.4
Social responsibility	3	1.2
COPD in family/among friends (including risk of COPD in family)	19	7.8
Available time	3	1.2
Primarily personal benefit ^b	128	52.2
Personal health benefit	120	49.0
Experience the discomfort of bronchoscopy	1	0.4
Challenge	1	0.4
Curiosity	14	5.7
Fun	1	0.4
Primarily obligation ^b	5	2.0
Acquaintance (in study, working with and was connected to the study or asked by)	4	1.6
Trust in authority/research	1	0.4
Missing	20	8.2

^aParticipation was not part of the questionnaire for the first four participants
^bUnique motives are categorised into three main motives (in italic) by merging the unique motives listed below the main motive. The frequency (n) of main motives is not equal to the sum of each principal motive because a subject stating both "personal health benefit" and "challenge" would result in two observations in principal motives, but just one after merging

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