[Retracted] Registered Trials of Artificial Intelligence Conducted on Chronic Liver Disease: A Cross-Sectional Study on ClinicalTrials.gov

Table 4

Designs of 13 observational trials registered in ClinicalTrial.gov.

Characteristics	Number	Percentage (%)
Observational model
Case-only	1	7.69
Case-control	2	15.38
Case-crossover	0	0
Cohort	8	61.54
Other	2	15.38
Time perspective
Prospective	6	46.15
Retrospective	4	30.77
Cross-sectional	2	15.38
Other	1	7.69
Registered year
2004-2010	0	0
2011-2016	2	15.38
2017-2021	11	84.62
Enrollment
0-99	1	7.69
100-500	4	30.77
>500	8	61.54
Gender
Female only	0	0
Both	13	100.00
Age
<18	0	0
≥18	10	76.92
All	3	23.08
Status
Not recruiting	3	23.08
Recruiting	8	61.54
Completed	2	15.38
Study results
Has results	0	0
No results available	13	100.00
Sponsor
University	3	23.08
Hospital	9	69.23
Company/industry	0	0
Institute	1	7.69
Other	0	0
Collaborators
University	1	7.69
Hospital	8	61.54
Company/industry	0	0
Institute	1	7.69
Other	3	23.08
Location
America	3	23.08
Europe	6	46.15
Asia	4	30.77