| Final data were abstracted directly from published articles or estimated from descriptive statistics presented in the articles. |
| The methodology is case studies which, although mainly historical in format, do periodically furnish topologies and descriptive statistics. |
| Characteristics of the sample population were analyzed using univariate descriptive statistics. |
| The descriptive statistics vary with number of samples, and tribometers report average friction values based on different sample sizes. |
| Summary descriptive statistics were computed by using proportions or medians and interquartile ranges. |
| The incidence, location, and type of injury, time loss caused by injury, and onset of injury were evaluated by using descriptive statistics. |
