Research Article| Volume 11, ISSUE 3, P212-213, July 1998

Download started.


Evaluating research when “no significant differences were found”

The issue of statistical power
      This paper is only available as a PDF. To read, Please Download here.


      When a researcher concludes that “no difference between groups was present,” there is the potential of the Type II error, which is indicative of low statistical power. Low power increases the chance of missing a difference between groups when, in fact, a difference really exists. The two primary reasons for low power are small sample size and small effect size, due to either large variation in the sample or treatments that do not have a substantial effect. When reading a scientific paper that has failed to find differences between groups, a critical reader should look for evidence from the author that the study had acceptable power.
      To read this article in full you will need to make a payment

      Purchase one-time access:

      Academic & Personal: 24 hour online accessCorporate R&D Professionals: 24 hour online access
      One-time access price info
      • For academic or personal research use, select 'Academic and Personal'
      • For corporate R&D use, select 'Corporate R&D Professionals'


      Subscribe to Journal of Hand Therapy
      Already a print subscriber? Claim online access
      Already an online subscriber? Sign in
      Institutional Access: Sign in to ScienceDirect