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Table 5 Multivariate logistic regression to determine relationship between risk factors and AMS prevalence

From: Population level determinants of acute mountain sickness among young men: a retrospective study

Indicators   Odd years (n = 1769)   Even years (n = 1958)
  β AOR 95%CI p-value β AOR 95%CI p-value
Demographic indicators         
   Ethnicity         
Han (Chinese) (ref.)   1.00     1.00   
Tibetan -3.39 0.03 0.01-0.25 0.001 -2.55 0.08 0.02-0.33 0.001
Hui -0.29 0.75 0.43-1.31 0.309 0.06 1.06 0.66-1.69 0.810
   Birth province         
Northwest province (ref.)   1.00     1.00   
Southwest province -0.04 0.96 0.75-1.24 0.758 0.18 1.19 0.94-1.51 0.149
East province 0.33 1.39 1.07-1.81 0.015 0.28 1.32 1.02-1.70 0.034
Health behavior         
   Prophylaxis         
No (ref.)   1.00     1.00   
Yes -0.29 0.75 0.60-0.93 0.008 -0.28 0.76 0.60-0.94 0.014
Travel indicators         
   Start point altitude         
1300-1500 m (ref.)   1.00     1.00   
900-1100 m 0.21 1.23 0.94-1.62 0.136 0.19 1.20 0.94-1.54 0.135
600-800 m 0.36 1.44 1.11-1.85 0.005 0.28 1.32 1.03-1.68 0.026
   Destination altitude         
2900-3100 m (ref.)   1.00     1.00   
3600-3700 m 1.00 2.71 2.03-3.62 < 0.001 1.01 2.74 2.11-3.56 < 0.001
4100-4300 m 1.42 4.12 3.10-5.46 < 0.001 1.37 3.94 3.04-5.11 < 0.001
   Deployment type         
Normal by land (ref.)   1.00     1.00   
Emergency by land 0.75 2.11 1.65-2.70 < 0.001 0.73 2.08 1.64-2.64 < 0.001
Normal by air 0.69 2.00 1.44-2.76 < 0.001 0.79 2.20 1.62-2.98 < 0.001
Emergency by air 0.88 2.40 1.66-3.46 < 0.001 1.21 3.34 2.41-4.65 < 0.001
   Travel season         
Warm (ref.)   1.00     1.00   
Cold 0.25 1.28 1.04-1.59 0.022 0.22 1.25 1.02-1.53 0.034