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> From: IN%"gregr@cs*.su*.oz*.au*" 28-NOV-1994 18:48:26.03 > To: IN%"techdiver@opal.com" > > From: Richard Taylor <100237.2220@co*.co*> > To: Jason Rogers <gasdive@sy*.di*.oz*.au*> > Cc: techdiver <techdiver@opal.com> > Subject: DCI Survey, was: Trimix Safety > > ... > To test this out, why not all those who have suffered DCI plse send me a > seven line posting & I will do a quick analysis. > > DCI SURVEY > -------------------- > > Have you suffered DCI? > Were you treated in a chamber? > Did you tell someone?. > What was the depth duration? > What Tables? > What Mixes? > What is your nationality? > > Rick Williams <RICK515@de*.co*> surveyed the techdiver list in 1993 > including the questions: > > Have you ever suffered a DCS episode? > If yes was it treated in a chamber > > Results were posted on 30 Sep 1993. Of the 35 people who responded by then > > DCS Episode 5 14.29% > Treated 2 5.71% > # DCS Episodes 7 > %DCS/DC Dive 0.18% > %DCS/Tot Dive 0.03% > %Res/DCS 14.29% > > He followed up on 4 Oct 1993 after getting a total of 42 responses with > > Incidence of DCS > > 11.90% of the respondents indicated having suffered a DCS hit > with a total of 7 episodes in five individuals. Only 4.76% > (2) received treatment in a chamber. There appeared to be no > correlation between DCS incidence and other answers excepts > that all were experienced divers. > > Based on the number of decompression dives there were 0.16% > incidence of DCS with decompression dives and a 0.03% incidence > with all dives. > > based on > > Total Dives: > > Since diving experience is exposure based, the respondents are an > experienced group. The forty two respondents reported 22,818 dives! > 11.90% had less than 100, 33.33% had 100-250, 28.57% have logged > 251-500 dives, 14.29% have between 501-1000 dives, 9.52% of the > respondents have between 1001-2500 dives, 0% answered 2500-5000 and > one person had over 5000 dives or an estimate 5400-5600! > > I guess Rick's survey postings are out there in the techdiver archives. > > Rick's survey wouldn't reveal all the information Richard wants, but it might > add some fuel to this DCI debate while Richard's survey results roll in. > > Greg Ryan gregr@cs*.su*.oz*.au* > I have all the results of the surveys taken on Scuba-L and Techdiver in an Excel file. I didn't look at DCS vs. Reported Experience on a case by case bases, or at least I don't recall doing so. I'll go back through the data. The final report should be in both the Scuba-L and Techdiver Archives since I posted the final results in both lists. I might mention that I have had several people and a couple of organizations express an interest in an updated survey of both lists. If I do it, it will probably be after the first of the year and I'll post a sample for comment before conducting it. That is one error on my part when the first one was done. If anyone has any thoughts about it, let me know. Rick Williams williams@sp*.ev*.ed* Answer Associates rick515@de*.co*
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