Distribution of observations across levels of independent variables included in models of Methodological Standards Reporting and Regulatory Compliance Reporting indices in 490 amyotrophic lateral sclerosis studies
| Variable | Level | n | Percentage |
| Year | 2005 | 77 | 13.58 |
| 2007 | 81 | 14.29 | |
| 2009 | 83 | 14.64 | |
| 2011 | 106 | 18.69 | |
| 2013 | 115 | 20.28 | |
| 2015 | 105 | 18.52 | |
| Study type | Concept | 460 | 81.13 |
| Preclinical | 107 | 18.87 | |
| Country | Australia | 14 | 2.47 |
| Belgium | 14 | 2.47 | |
| Canada | 29 | 5.11 | |
| China | 28 | 4.94 | |
| France | 18 | 3.17 | |
| Germany | 25 | 4.41 | |
| Israel | 18 | 3.17 | |
| Italy | 50 | 8.82 | |
| Japan | 65 | 11.46 | |
| Other | 43 | 7.58 | |
| South Korea | 25 | 4.41 | |
| Spain | 15 | 2.65 | |
| Sweden | 12 | 2.12 | |
| UK | 23 | 4.06 | |
| USA | 188 | 33.16 | |
| Journal | Brain | 9 | 1.59 |
| Brain Res | 20 | 3.53 | |
| Eur J Neurosci | 8 | 1.41 | |
| Exp Neurol | 31 | 5.47 | |
| Front Cell Neurosci | 12 | 2.12 | |
| Hum Mol Gen | 24 | 4.23 | |
| J Biol Chem | 19 | 3.35 | |
| J Neurochem | 15 | 2.65 | |
| J Neuroinflamm | 9 | 1.59 | |
| J Neurosci | 20 | 3.53 | |
| J Neurosci Res | 9 | 1.59 | |
| Mol Neurodegener | 8 | 1.41 | |
| Neurobiol Dis | 34 | 6.00 | |
| Neurosci | 15 | 2.65 | |
| Other | 271 | 47.80 | |
| PLOS One | 45 | 7.94 | |
| Proc Natl Acad Sci USA | 18 | 3.17 | |
| Severity | 1 | 14 | 2.5 |
| 2 | 20 | 3.5 | |
| 3 | 46 | 8.1 | |
| 4 | 346 | 60.8 | |
| 5 | 64 | 11.2 | |
| Inconclusive | 79 | 13.9 |