Just for reference, here is a paragraph (slightly modified, technical numbers removed) from the abstract of a study made at Mt. Whitney, 2005 and 2006, published in 2008:

Results:  Forty-three percent of the sample met the criteria for AMS, and 81% reached the summit.  The odds of experiencing AMS were reduced with increases in age, number of hours spent above 3000 m in the 2 wk preceding the ascent, and for females.  Climbers who had a history of AMS and those taking analgesics were more likely to experience AMS.  As climber age increased, the odds of reaching the summit decreased.  However, increases in the number of hours per week spent training, rate of ascent, and previous high-altitude record were all associated with increased odds for summit success.

More details here:   Altitude Research Study at Whitney Portal
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