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. Author manuscript; available in PMC: 2013 Feb 3.
Published in final edited form as: Read Psychol. 2012 Feb 3;33(1-2):133–161. doi: 10.1080/02702711.2012.631863

Table 5.

Test Re-test Reliability across Alternate Forms for ORF Median and Mean Score and z-score test of the Difference in A Reliability of across Testing Time Points 1–5 for Struggling Readers.

Test Re-test Reliability across Alternate Forms for the ORF Median and Mean Score (Time Point 1 with Time Points 2–5)
Time Point 1 – Time Point 2 Time Point 1 – Time Point 3 Time Point 1 – Time Point 4 Time Point 1 – Time Point 5
Median .91 .90 .88 .85
Mean .92 .90 .88 .86
Testing the Magnitude of the Difference between the Test Re-test Reliability ORF Median and Mean Score (Time Point 1 with Time Points 2–5)
Time Point 1 – Time Point 2 Time Point 1 – Time Point 3 Time Point 1 – Time Point 4 Time Point 1 – Time Point 5
Median vs. Mean −1.17 0 0 −.71

Note. n = 727.

a

alternate form reliability of ORF Median Score is statistically higher than ORF Mean Score;

b

alternate form reliability of ORF Mean Score is statistically higher than Median Score. Alpha per comparison = 0.05/2 = 0.025. Critical z = 2.33.