Quality assessment of registration information on simple items (n [%])*
| No. | Simple items (n=16) | Total (n=2955) | ChiCTR (n=1200) | ClinicalTrials.gov (n=1013) | Other registries (n=742) |
| 1 | Primary registry and trial identifying number | 2955 (100) | 1200 (100) | 1013 (100) | 742 (100) |
| 2 | Date of registration in primary registry | 2955 (100) | 1200 (100) | 1013 (100) | 742 (100) |
| 3 | Secondary identifying numbers | 1469 (49.7) | 106 (8.8) | 1013 (100) | 350 (47.2) |
| 4 | Source(s) of monetary or material support | 1885 (63.8) | 1153 (96.1) | 0 (0) | 732 (98.7) |
| 5 | Primary sponsor | 2950 (99.8) | 1199 (99.9) | 1011 (99.8) | 740 (99.7) |
| 6 | Secondary sponsor(s) | 1179 (39.9) | 722 (60.2) | 315 (31.1) | 142 (19.1) |
| 7 | Contact for public queries | 2726 (92.3) | 1200 (100) | 896 (88.5) | 630 (84.9) |
| 8 | Contact for scientific queries | 2695 (91.2) | 1200 (100) | 758 (74.8) | 737 (99.3) |
| 9 | Public title | 2955 (100) | 1200 (100) | 1013 (100) | 742 (100) |
| 10 | Scientific title | 2928 (99.1) | 1200 (100) | 1004 (99.1) | 724 (97.6) |
| 11 | Countries of recruitment | 2871 (97.2) | 1197 (99.8) | 932 (92.0) | 742 (100) |
| 12 | Health condition(s) or problem(s) studied | 2950 (99.8) | 1200 (100) | 1013 (100) | 737 (99.3) |
| 16 | Date of first enrollment | 2954 (99.9) | 1199 (99.9) | 1013 (100) | 742 (100) |
| 17 | Target sample size | 2950 (99.8) | 1200 (100) | 1012 (99.9) | 738 (99.5) |
| 18 | Recruitment status | 2955 (100) | 1200 (100) | 1013 (100) | 742 (100) |
| 22† | Approvals | 1612 (54.6) | 1157 (96.4) | 0 (0) | 455 (61.3) |
| Total items | Average report percentage (%) | 86.7 | 91.3 | 80.3 | 87.9 |
*The total number of eligible trials with TCM interventions was 2955. Of them, 1200 trials were registered in ChiCTR and 1013 came from ClinicaTrials.gov. For purposes of calculation and comparison, we treated the other 13 registries (ie, ANZCTR, CRIS, DRKS, IRCT, ISRCTN, JPRN, etc.) as a single group. There included three groups of: (1) ChiCTR (1200 trials), (2) ClinicaTrials.gov (1013 trials) and (3) other registries (742 trials).
†Additional item 22.
ANZCTR, Australian New Zealand Clinical Trials Registry; ChiCTR, Chinese Clinical Trial Registry; CRIS, Clinical Research Information Service-Republic of Korea; DRKS, German Clinical Trials Register; IRCT, Iranian Registry of Clinical Trials; ISRCTN, International Standard Randomized Controlled Trial Number Register; JPRN, Japan Primary Registries Network.