[abstract] MAXIMUM LIKELIHOOD ANALYSIS TO COMPARE SINGLE VS REPEAT/MULTI-LEVEL NITROX DIVES.

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[abstract] MAXIMUM LIKELIHOOD ANALYSIS TO COMPARE SINGLE VS REPEAT/MULTI-LEVEL NITROX DIVES.

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Title: [abstract] MAXIMUM LIKELIHOOD ANALYSIS TO COMPARE SINGLE VS REPEAT/MULTI-LEVEL NITROX DIVES.
Author: Albin, GW; Weathersby, PK; Survanshi, SS
Abstract: The relative safety of single and repeat/multi-level dives is being studied using mathematical models to calculate the probability of decompression sickness [P(DCS)] for each dive profile. Our underlying models contain a number of adjustable parameters whose values have been optimized by applying the parameter estimation technique of maximum likelihood analysis to a diverse collection of wet dive data. The current data base includes 1450 single dives and 556 repeat/multi-level dives. Of these 2006 dives, 921 were air, 563 were on a constant 0.7 atm oxygen, and 522 were on other nitrox breathing mixes. We have found no appreciable statistical support for using a different set of parameter values for repeat/multi-level dives than for single dives. That is, we can use a model calibrated against single dives to predict the outcome of repeat/multi-level dives. Also, we find that the partial pressure of oxygen in the breathing gas mix has a negligible effect on P(DCS) and that models that ignore dissolved oxygen do not require different parameters for different nitrogen/oxygen breathing mixes. A single probabilistic model that can describe any type of nitrox dive now seems attainable. The calibrated models are being used as a tool to assess the safety of established repeat dive procedures. (Supported by NMRDC Work Unit M0099.01A.1002)
Description: Abstract of the Undersea and Hyperbaric Medical Society, Inc. Annual Scientific Meeting held 6-11 June 1989. Hawaiian Regent Hotel, Honolulu, Hawaii, USA (http://www.uhms.org)
URI: http://archive.rubicon-foundation.org/6803
Date: 1989

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  • UHMS Meeting Abstracts
    This is a collection of the published abstracts from the Undersea and Hyperbaric Medical Society (UHMS) annual meetings.

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