Form equivalence of the speech perception in noise (SPIN) test

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Abstract
An evaluation was conducted of the equivalence of the 10 forms of the Speech Perception in Noise (SPIN) Test with normal hearing subjects. Each subject was tested monaurally on all 10 forms. Subjects (25) were presented the materials at 80 dB SPL [sound pressure level] at a signal-to-babble ratio of -1 dB. An additional 25 subjects heard the materials at 30 dB SPL, at a signal-to-babble ratio of +3 dB. The data were analyzed for equivalence using a parallel tests model. A detailed rationale for the application of this model to the equivalence of the SPIN test is presented. Apparently a subset of 7 lists fits the equivalence model for PH [high predictability], PL [low predictability], and difference (PH - PL) scores. Analysis of list-pair data (combination of companion forms) suggested that all 5 list-pairs resulted in equivalent performance.

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