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Table 1 Characteristics of the surveyed independent variables

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

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
 ΔPB from the 5th to the summit, hPa -134.5 ± 0.4 -132.7 ± 0.4 - 1.80 1.96 4.84 < 0.001
 ΔTa from the 5th to the summit, °C -10.8 ± 0.9 -10.7 ± 1.0 - -0.13 0.29 0.09 0.435
 Time from the 5th to the summit, min 939 ± 130 971 ± 167 - -0.11 65.0 0.21 0.051
(iii) ΔPB per hour from the 5th station to the summit, hPa h-1 -8.8 ± 1.3 -8.4 ± 1.4 - 0.06 0.65 0.25 0.019
(iv) ΔTa per hour from the 5th 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
  1. 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. PB barometric pressure, Ta 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