The Effect of Path and Beginning Time of Ascending on Incidence of Acute Mountain Sickness around Mount Damavand in Iran (5671 m)

Table 4

Variables associated with incidence of disease in the univariate analysis.

Variable	Definition	AMS		𝑃 value*
		Positive	Negative
Beginning time of ascent^†	00:00–05:59; 06:00–11:59; 12:00–17:59	106 (60.6%); 70 (44.9%); 10 (52.6%)	68 (39.4%); 86 (55.1%); 8 (47.4%)	0.02
Sleeping at 4200 m altitude	Positive; Negative	139 (45.3%); 27 (67.5%)	168 (54.7%); 13 (32.5%)	0.01
Home altitude	Less than 1000 m; More than 1000 m	33 (61.1%); 132 (44.9%)	21 (38.9%); 162 (55.1%)	0.03
AMS history	Positive; Negative	79 (55.2%); 88 (42.7%)	64 (44.8%); 118 (57.3%)	0.02
AMS history in Damavand	Positive; Negative	75 (56.4%); 61 (36.5%)	58 (43.6%); 106 (63.5%)	0.001

*Based on chi-square or Fisher exact test.
^†There was just 1 participant who trekked between 18:00 and 11.59 PM. He did not meet criteria of AMS, so we omitted him from analysis of this item.