| Findability |
Difficulty finding relevant data |
71(20.5) |
25(7.2) |
84(24.2) |
119(34.2) |
48(13.8) |
| |
Data not available at the time of publication of research findings |
112(32.2) |
42(12.1) |
81(23.3) |
78(22.5) |
34(9.8) |
| |
Data no longer exists in the repository |
156(44.9) |
46(13.3) |
66(19) |
54(15.6) |
25(7.2) |
| Accessibility |
Unclear process for accessing the data |
71(20.5) |
52(15) |
89(25.6) |
86(24.8) |
49(14.1) |
| |
Excessive bureaucracy |
84(24.2) |
44(12.7) |
91(26.2) |
90(25.9) |
38(11) |
| |
Slow or no response from the data provider |
106(30.5) |
43(12.4) |
78(22.5) |
72(20.7) |
48(13.8) |
| |
Denied access to data |
151(43.4) |
41(11.8) |
60(17.3) |
43(12.4) |
52(15) |
| |
The cost of data was prohibitive |
168(48.3) |
39(11.3) |
47(13.6) |
52(15) |
41(11.8) |
| Interoperability |
Limited or no metadata (data dictionary, protocol, statistical analysis plan) |
120(34.5) |
39(11.3) |
92(26.5) |
57(16.4) |
39(11.3) |
| |
Difficulty understanding the data |
81(23.3) |
41(11.8) |
107(30.8) |
79(22.8) |
39(11.3) |
| |
Data was in a different language |
155(44.6) |
54(15.6) |
63(18.2) |
53(15.3) |
22(6.4) |
| |
Unusable data format or structure |
103(29.6) |
40(11.5) |
97(27.9) |
74(21.3) |
33(9.5) |
| Reusability |
Data was provided with investigator-imposed restrictions |
129(37.1) |
42(12.1) |
70(20.2) |
67(19.3) |
39(11.3) |
| |
Ethical, legal, or privacy restrictions |
113(32.5) |
52(15) |
68(19.6) |
69(19.9) |
45(13) |
| |
Data variables needed were not collected in the dataset |
85(24.5) |
34(9.8) |
79(22.8) |
95(27.3) |
54(15.6) |
| |
Errors or inconsistencies in data |
85(24.5) |
34(9.8) |
104(29.9) |
72(20.7) |
52(15) |
| |
Incompleteness of data (many values were missing) |
74(21.3) |
30(8.7) |
95(27.3) |
82(23.6) |
66(19) |
| |
Inappropriate study design (such as inappropriate outcome measures) |
119(34.2) |
46(13.3) |
101(29.1) |
60(17.3) |
20(5.8) |
| |
Insufficient data (e.g. sample size too small) |
98(28.2) |
37(10.7) |
86(24.8) |
93(26.8) |
33(9.5) |
| |
Lack of resources to use data |
135(38.8) |
46(13.3) |
83(23.9) |
54(15.6) |
29(8.4) |
