Table 3. Animal studies: Itemized scoring of study quality using a modified Downs and Black checklist
| First author, year | 
1 | 
2 | 
3 | 
4 | 
5 | 
6 | 
7 | 
8 | 
9 | 
10 | 
11 | 
12 | 
13 | 
Total | 
Quality | 
| Bullimore, 2008 | 
1 | 
1 | 
0 | 
1 | 
1 | 
1 | 
1 | 
0 | 
1 | 
1 | 
1 | 
0 | 
0 | 
9 | 
9/13 | 
| Cavagna, 1968 | 
1 | 
1 | 
1 | 
1 | 
0 | 
0 | 
1 | 
0 | 
1 | 
1 | 
1 | 
0 | 
0 | 
8 | 
8/13 | 
| Cavagna, 1974 | 
1 | 
1 | 
1 | 
1 | 
1 | 
0 | 
1 | 
0 | 
1 | 
1 | 
1 | 
0 | 
0 | 
9 | 
9/13 | 
| Cavagna,1981 | 
1 | 
1 | 
1 | 
1 | 
1 | 
0 | 
1 | 
0 | 
1 | 
1 | 
1 | 
0 | 
0 | 
9 | 
9/13 | 
| Cavagna, 1994 | 
1 | 
0 | 
1 | 
1 | 
1 | 
0 | 
1 | 
0 | 
0 | 
1 | 
1 | 
0 | 
0 | 
7 | 
7/13 | 
| Ettema, 1992 | 
1 | 
1 | 
1 | 
1 | 
1 | 
0 | 
1 | 
1 | 
1 | 
1 | 
1 | 
0 | 
0 | 
10 | 
10/13 | 
| Ettema, 1990 | 
1 | 
1 | 
1 | 
1 | 
1 | 
0 | 
1 | 
1 | 
1 | 
1 | 
1 | 
0 | 
0 | 
10 | 
10/13 | 
| Ettema, 1990 | 
1 | 
1 | 
1 | 
1 | 
1 | 
0 | 
1 | 
1 | 
1 | 
1 | 
1 | 
0 | 
0 | 
10 | 
10/13 | 
| Fukutani, 2017 | 
1 | 
1 | 
1 | 
1 | 
0 | 
1 | 
1 | 
1 | 
1 | 
1 | 
1 | 
1 | 
0 | 
11 | 
11/13 | 
| Fukutani, 2018 | 
1 | 
1 | 
1 | 
1 | 
1 | 
1 | 
1 | 
1 | 
1 | 
1 | 
1 | 
0 | 
0 | 
11 | 
11/13 | 
| Herzog, 2000 | 
1 | 
1 | 
1 | 
1 | 
1 | 
0 | 
1 | 
1 | 
1 | 
1 | 
1 | 
0 | 
0 | 
10 | 
10/13 | 
| Lee, 2001 | 
1 | 
1 | 
1 | 
1 | 
1 | 
0 | 
1 | 
1 | 
1 | 
1 | 
1 | 
0 | 
0 | 
9 | 
10/13 | 
| Sugi (1988) | 
0 | 
1 | 
0 | 
0 | 
0 | 
0 | 
1 | 
0 | 
1 | 
1 | 
1 | 
0 | 
0 | 
5 | 
5/13 | 
| Takarada (1997) | 
1 | 
1 | 
0 | 
1 | 
0 | 
0 | 
1 | 
1 | 
1 | 
1 | 
1 | 
0 | 
0 | 
8 | 
8/13 |