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Table 2 Self-reported non response-reasons in an observational research bronchoscopy study

From: Motivation and response rates in bronchoscopy studies

Reasons Non-responders Study category
Initial, n = 139 Frequency (%) Late, n = 88 Frequency (%) p Controls, n = 84 Frequency (%) OLD, n = 143 Frequency (%) p
Discomfort 33 (23.7) 16 (18.2) 0.3 19 (22.6) 30 (21.0) 0.2
Unspecified worries/fear concerning participation 23 (16.5) 30 (34.1) < 0.01 19 (22.6) 34 (23.8) 0.08
Disease/health issues 24 (17.3) 23 (26.1) 0.1 8 (9.5) 39 (27.3) < 0.01
Study fatigue 14 (10.1) 2 (2.3) 0.03 5 (6.0) 11 (7.7) 0.2
Time constraint 5 (3.6) 5 (5.7) 0.5 7 (8.3) 3 (2.1) 0.2
Practicala 5 (3.6) 6 (6.8) 0.3 5 (6.0) 6 (4.2) 0.9
Not satisfied with previous study participation 2 (1.4) 0 0.5 0 2 (1.4) 0.5
Feeling too old 2 (1.4) 0 0.5 2 (2.4) 0 0.2
Refuse to specify 1 (0.7) 0 1.0 1 (1.2) 0 0.5
Personal reason 0 3 (3.4) 0.06 1 (1.2) 2 (1.4) 1.0
Not specified 30 (21.6) 3 (3.4) < 0.01 17 (20.2) 16 (11.2) 0.7
  1. OLD obstructive lung disease
  2. aPractical reflects practical issues for researcher or patient