TY - JOUR
T1 - Misinterpretations of the ‘p value’: a brief primer for academic sports medicine
JF - British Journal of Sports Medicine
JO - Br J Sports Med
SP - 1176
LP - 1177
DO - 10.1136/bjsports-2016-097072
VL - 51
IS - 16
AU - Stovitz, Steven D
AU - Verhagen, Evert
AU - Shrier, Ian
Y1 - 2017/08/01
UR - http://bjsm.bmj.com/content/51/16/1176.abstract
N2 - When comparing treatment groups, the p value is a statistical measure that summarises the chance (‘p’ for probability) that one would obtain the observed result (or more extreme), if and only if, the treatment is ineffective (ie, under the assumption of the ‘null’ hypothesis). The p value does not tell us the probability that the null hypothesis is true.1 This editorial discusses how some common misinterpretations of the p value may impact sports medicine research. Although presented from a treatment standpoint, the same principles hold for causes or prevention.p Values are probabilities, yet often interpreted based on a categorical cut-off, generally at the level of 0.05 (ie, 5%). Anything below is considered a ‘statistically significant difference’ and vice versa. However, one would not change a decision to buy a lottery ticket if the chance of winning was 4.9% (p=0.049i) instead of 5.1% (p=0.051). Consider a study where 100 participants who were given an injury prevention programme had six injuries, and 100 participants …
ER -