Does change in barometric pressure per given time at high altitude influence symptoms of acute mountain sickness on Mount Fuji? A pilot study

Table 1 Characteristics of the surveyed independent variables

Independent variables	With AMS	Without AMS	OR	95%CI		Effect size	P values
				Lower	Upper
(i)Sex
Men	91 (42%)	128 (58%)	1.02	0.66	1.58	0.01	1.000
Women	55 (41%)	79 (59%)
(ii) Age, years	36.2 ± 13.7	36.0 ± 13.7	-	-3.09	2.72	-0.01	0.903
ΔP_B from the 5^th to the summit, hPa	-134.5 ± 0.4	-132.7 ± 0.4	-	1.80	1.96	4.84	< 0.001
ΔT_a from the 5^th to the summit, °C	-10.8 ± 0.9	-10.7 ± 1.0	-	-0.13	0.29	0.09	0.435
Time from the 5^th to the summit, min	939 ± 130	971 ± 167	-	-0.11	65.0	0.21	0.051
(iii) ΔP_B per hour from the 5^th station to the summit, hPa h^-1	-8.8 ± 1.3	-8.4 ± 1.4	-	0.06	0.65	0.25	0.019
(iv) ΔT_a per hour from the 5^th station to the summit, °C	-0.71 ± 0.13	-0.68 ± 0.13	-	-0.004	0.05	0.18	0.094
(v) Relative humidity at the summit, %	68.3 ± 17.1	71.7 ± 19.6	-	-0.57	7.34	0.18	0.093
(vi) Hut altitude, m	3195 ± 239	3206 ± 244	-	-40.8	62.0	0.04	0.686
Perceived sleep quality index
(vii) Sleep time, min	192 ± 117	229 ± 115	-	11.9	61.1	0.32	0.004
(viii) Sleepiness on rising	15.8 ± 6.5	19.4 ± 7.1	-	2.10	5.03	0.52	< 0.001
(ix) Initiation, and maintenance of sleep	8.4 ± 7.0	11.3 ± 8.1	-	1.32	4.57	0.39	< 0.001
(x) Frequent dreaming	24.4 ± 8.0	24.1 ± 8.2	-	-2.02	1.43	-0.04	0.736
(xi) Refreshing	9.8 ± 6.7	14.2 ± 7.6	-	2.85	5.93	0.61	< 0.001
(xii) Length of sleep	12.4 ± 7.8	15.1 ± 7.3		1.11	4.31	0.36	< 0.001

For the categorical variable (i.e., sex), the number of participants belonging to different categories and their proportions (in parentheses) are shown. When analyzing, set the top category to 0 and the bottom to 1. For continuous variables (all the others), values are represented as the means ± standard deviations. P_B barometric pressure, T_a ambient temperature, OR odds ratio, CI confidential interval; - indicates not appreciable. Note that items identified by roman numbers were used for multiple logistic analysis. Items without roman numbers were excluded as these were covariate variables. Note that Cramer’s V-test was determined for “sex” and Cohen’s d-test was determined for other variables

ISSN: 1880-6805