Skip to main content
. Author manuscript; available in PMC: 2013 Oct 4.
Published in final edited form as: ALTEX. 2013;30(3):275–291. doi: 10.14573/altex.2013.3.275

Tab. 3. Twenty Statistical Errors Even YOU Can Find in Biomedical Research Articles.

reproduced with permission of the Croat Med J from Lang (2004)

  • #1: Reporting measurements with unnecessary precision

  • #2: Dividing continuous data into ordinal categories without explaining why or how

  • #3: Reporting group means for paired data without reporting within-pair changes

  • #4: Using descriptive statistics incorrectly

  • #5: Using the standard error of the mean (SEM) as a descriptive statistic or as a measure of precision for an estimate

  • #6: Reporting only P values for results

  • #7: Not confirming that the data met the assumptions of the statistical tests used to analyze them

  • #8: Using linear regression analysis without establishing that the relationship is, in fact, linear

  • #9: Not accounting for all data and all patients

  • #10: Not reporting whether or how adjustments were made for multiple hypothesis tests

  • #11: Unnecessarily reporting baseline statistical comparisons in randomized trials

  • #12: Not defining “normal” or “abnormal” when reporting diagnostic test results

  • #13: Not explaining how uncertain (equivocal) diagnostic test results were treated when calculating the test's characteristics (such as sensitivity and specificity)

  • #14: Using figures and tables only to “store” data, rather than to assist readers

  • #15: Using a chart or graph in which the visual message does not support the message of the data on which it is based

  • #16: Confusing the “units of observation” when reporting and interpreting results

  • #17: Interpreting studies with nonsignificant results and low statistical power as “negative,” when they are, in fact, inconclusive

  • #18: Not distinguishing between “pragmatic” (effectiveness) and “explanatory” (efficacy) studies when designing and interpreting biomedical research

  • #19: Not reporting results in clinically useful units

  • #20: Confusing statistical significance with clinical importance