Examination Statistics

Examination statistics for recent editions of AHA Certification Examinations are presented in the following table.  Statistics are based on performance of first-time test-takers.  Discussions of statistics follow the table.

Data on past editions of the CAVS Examination are not available.








Dates Administered

9/1/04 - 1/1/07
5/1/03 - 1/1/06
1/3/05 - 1/1/07
1/5/04 - 11/1/06
Number of Scored Items





Minimum Passing Score





Percent Passing





Maximum Score





Mean Score





Minimum Score





Standard Deviation





KR20 Reliability





Decision Consistency  Reliability





Number of Scored Items - 100 test items impact a candidate's score.  The 10 pretest items included on each edition of an Examination are "trial" items and do not affect a candidate's score.

Minimum Passing Score - The minimum number of test items a candidate needs to answer correctly to pass the Examination.

Percent Passing - The percent of first-time test-takers who passed the Examination.

Maximum Score - The highest score attained by a first-time test-taker. 

Mean Score - The average score of all first-time test-takers who took this edition of the Examination.  The mean score is an indicator of difficulty of the Examination.

Minimum Score - The lowest score attained by a first-time test-taker.

Standard Deviation - A measure of variability or spread in scores. 

KR20 Reliability Coefficient - An index of the degree of measurement precision.  The Kuder-Richardson 20 reliability coefficient provides an estimate of internal consistency.  Values can range from 0.00 to 1.00, with high values indicating that the Examination is likely to correlate with alternate forms, a desirable characteristic.  The KR20 is impacted by difficulty, spread in scores and length of the Examination.

Decision Consistency Index - An estimate of the expected repeatability of pass/fail results.  Values can range from 0.00 to 1.00, with high values being desirable.  Some psychometricians believe that, for criterion-referenced examinations, such as AHA Certification Examinations, this is a better estimate of reliability than the KR20 coefficient.  The index is impacted by difficulty, cut score, variance, reliability and length of the Examination.


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