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Table 4 Acute mountain sickness among young men who entered the Tibetan-Qinghai plateau: prevalence and univariate logistic regression analysis (even years, n = 1958)

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

Indicators Total number of young men Number of diagnosed
AMS cases(%)
β OR 95%CI p-value
Demographic characteristics       
   Age -- -- 0.05 1.05 0.98-1.13 0.148
   Ethnicity       
Han (Chinese) (ref.) 1818 596(24.4)   1.00   
Tibetan 43 2(2.4) -2.30 0.10 0.02-0.41 0.002
Hui (Muslim) 97 32(24.6) 0.01 1.01 0.65-1.56 0.966
   Birth province       
Northwest province (ref.) 818 224(21.3)   1.00   
Southwest province 671 214(23.4) 0.10 1.10 0.88-1.37 0.391
East province 469 172(29.0) 0.31 1.36 1.07-1.73 0.012
   Education       
≤Junior high school (ref.) 1079 351(24.1)   1.00   
= High school 843 270(23.6) -0.02 0.98 0.81-1.19 0.815
≥College 36 9(16.7) -0.37 0.69 0.32-1.49 0.344
   BMI       
Normal 1500 480(32.0)     
Underweight 234 65(27.8) -0.20 0.82 0.60-1.11 0.196
Overweight 224 85(37.9) 0.26 1.30 0.97-1.74 0.078
   Rank       
Private (ref.) 1666 533(23.5)   1.00   
NCO 229 70(22.0) -0.07 0.94 0.69-1.26 0.664
Officer 63 27(37.5) 0.47 1.59 0.96-2.65 0.073
Health behavior       
   Alcohol drinking       
Yes (ref.) 617 194(22.9)   1.00   
No 1341 436(24.1) 0.05 1.05 0.86-1.29 0.638
   Cigarette smoking       
Yes (ref.) 1190 392(24.6)   1.00   
No 768 238(22.5) -0.09 0.91 0.75-1.11 0.367
   Prophylaxis       
No (ref.) 1362 463(25.8)   1.00   
Yes 596 167(19.5) -0.28 0.76 0.61-0.93 0.009
Travel profile       
   Start point altitude       
1300-1500 m (ref.) 843 250(21.1)   1.00   
900-1100 m 563 188(25.1) 0.17 1.19 0.95-1.50 0.138
600-800 m 552 192(26.7) 0.24 1.27 1.01-1.59 0.044
   Destination altitude       
2900-3100 m (ref.) 687 119(10.5)   1.00   
3600-3700 m 634 232(28.9) 1.01 2.75 2.13-3.56 < 0.001
4100-4300 m 637 279(39.0) 1.31 3.72 2.89-4.79 < 0.001
   Deployment type       
Normal by land (ref.) 885 203(14.9)   1.00   
Emergency by land 587 221(30.2) 0.71 2.03 1.61-2.55 < 0.001
Normal by air 268 105(32.2) 0.77 2.16 1.62-2.90 < 0.001
Emergency by air 218 218(43.2) 1.06 2.90 2.13-3.95 < 0.001
   Travel season       
Warm (ref.) 1135 346(21.9)   1.00   
Cold 823 284(26.3) 0.18 1.20 0.99-1.45 0.060