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 |
| 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 | |
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