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. 2019 Oct 30;20:618. doi: 10.1186/s13063-019-3737-1

Table 5.

Study-related barriers

Factors in questionnaire n %
Narrowly defined criteria for inclusion and exclusion 40 31
That inclusion is not a simple process 22 17
Comprehensive monitoring 16 12
Weak and unclear organisation by those leading the trial 14 11
The regulations for clinical trials 10 8

n denotes the number of alternatives 4 and 5 on a Likert scale: 1 (completely disagree), 3 (partially agree) and 5 (completely agree)