Table 5.

Trends in Evaluated Metrics From 2012 to 2022

Dependent Variable	β coefficient from 2012 to 2022	R 2	P Value
Type of study (%)
Clinical	0.32	0.10	0.34
Original data	−0.34	0.09	0.37
Randomized controlled trials	−0.32	0.14	0.26
Database	0.97	0.82	0.00012
Preclinical	−0.57	0.66	0.0025
Biomechanic	0.00070	0.05	0.51
Cellular	−0.46	0.39	0.039
Anatomic	−0.17	0.26	0.11
Other
Economics, policy, conference exhibits, occupational etc.	0.34	0.28	0.096
Level of evidence
1	−0.0018	0.077	0.41
2	−0.0084	0.43	0.029
3	0.01	0.41	0.034
4	−0.00082	0.0069	0.81
5	—	—	—
First author degree
MD or DO	−0.74	0.44	0.025
MD/PhD	0.25	0.12	0.30
PhD	0.095	0.062	0.46
Non-MD	0.39	0.58	0.0068
No. of authors	0.10	0.61	0.0043
US studies	−0.0096	0.0062	0.82

Values with P < 0.05 in bold.