What does PTA4 stand for?

MLA style: "PTA4." Acronym Finder . 2013. AcronymFinder.com 25 May. 2013 http://www.acronymfinder.com/Pure-Tone-Average-Thresholds-(PTA4).html
Chicago style: Acronym Finder . S.v. "PTA4." Retrieved May 25 2013 from http://www.acronymfinder.com/Pure-Tone-Average-Thresholds-(PTA4).html
APA style: PTA4. (n.d.) Acronym Finder. (2013). Retrieved May 25 2013 from http://www.acronymfinder.com/Pure-Tone-Average-Thresholds-(PTA4).html

Pure Tone Average Thresholds

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Public Transport Authority (Australia) Public Transportation Account (California) Pulsar Timing Array Pure Tone Average (hearing exams) Pure-Tone Audiometry (hearing test) Purified Terephthalic Acid Spanish Peseta (national currency) Preferential Trade Area of East and Southern Africa Penicillin Transcriptional Activator 1 Platelet and T Cell Antigen 1 (biochemistry)		Airman Apprentice, Photographic Intelligenceman Striker (Naval Rating) Philippine Travel Agencies Association (est. 1979) Pioneer Total Abstinence Association of the Sacred Heart (Ireland) Pittsburgh Turkish American Association (Pennsylvania) Plantation Timber Association of Australia Please Take Appropriate Action Property Tax Assessment Appeals Board (Maryland) Professional, Technical, Administrative and Ancillary Staff (UK) Patent Trial and Appeal Board (USPTO) Planning and Technological Assistance Branch