RT Journal
A1 Houston CS
T1 INcidence of acute mountain sickness at intermediate altitudes
JF JAMA
JO JAMA
YR 1989
FD June 23
VO 261
IS 24
SP 3551
OP 3552
DO 10.1001/jama.1989.03420240065022
UL http://dx.doi.org/10.1001/jama.1989.03420240065022
AB To the Editor. — 
    As more and more people flock to mountain resorts, it is evident that acute mountain sickness exacts a significant human and economic toll at even moderate altitude. Singh et al,1 describing 1905 cases among Indian troops, found incidences ranging from 0.8% to 8.0% between companies. Hackett et al2 reported that 52.5% of 278 trekkers at 4200 m in Nepal had one of several forms of altitude sickness, while Larsen et al,3 in a double-blind study on 4200-m Mt Rainier, found that 25% of untreated subjects experienced acute mountain sickness. R. Yip (personal communication, 1989) questioned 101 epidemiologists at a meeting at 2940 m in Colorado; of these, 42% had typical acute mountain sickness. In 1982, a survey4 of 3906 visitors at six Colorado resorts between 2400 and 2850 m in elevation showed that 12% had three or more of the five classic