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Table 3 Acute mountain sickness among young men who entered the Tibetan-Qinghai plateau: prevalence and univariate logistic regression analysis (odd years, n = 1769)

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 characteristic

      

   Age

--

--

-0.01

0.99

0.92-1.07

0.781

   Ethnicity

      

Han (Chinese) (ref.)

1654

545(24.6)

 

1.00

  

Tibetan

44

1(1.2)

-3.05

0.05

0.01-0.34

0.003

Hui (Muslim)

71

20(19.6)

-0.23

0.80

0.47-1.35

0.401

   Birth province

      

Northwest province (ref.)

726

228(22.9)

 

1.00

  

Southwest province

595

176(21.0)

-0.09

0.92

0.72-1.16

0.474

East province

448

162(28.3)

0.21

1.24

0.97-1.59

0.093

   Education

      

≤Junior high school (ref.)

981

310(23.1)

 

1.00

  

= High school

746

244(24.3)

0.05

1.05

0.86-1.29

0.625

≥College

42

12(20.0)

-0.14

0.87

0.44-1.71

0.679

   BMI

      

Normal

1375

449(32.7)

    

Underweight

215

60(27.9)

-0.23

0.80

0.58-1.10

0.166

Overweight

179

57(31.8)

-0.04

0.96

0.69-1.35

0.828

   Rank

      

Private (ref.)

1507

487(23.9)

 

1.00

  

NCO

204

59(20.3)

-0.16

0.85

0.62-1.18

0.329

Officer

58

20(26.3)

0.10

1.10

0.63-1.91

0.729

Health behavior

      

   Alcohol drinking

      

Yes (ref.)

538

174(23.9)

 

1.00

  

No

1231

392(23.4)

-0.02

0.98

0.79-1.21

0.836

   Cigarette smoking

      

Yes (ref.)

1052

354(25.4)

 

1.00

  

No

717

212(21.0)

-0.19

0.83

0.67-1.02

0.071

   Prophylaxis

      

No (ref.)

998

341(26.0)

 

1.00

  

Yes

771

225(20.6)

-0.23

0.79

0.65-0.97

0.026

Travel profile

      

   Start point altitude

      

1300-1500 m (ref.)

606

166(18.9)

 

1.00

  

900-1100 m

511

163(23.4)

0.22

1.24

0.96-1.61

0.100

600-800 m

652

237(28.6)

0.41

1.51

1.19-1.92

0.001

   Destination altitude

      

2900-3100 m (ref.)

558

91(19.5)

 

1.00

  

3600-3700 m

587

202(26.2)

0.99

2.69

2.03-3.57

< 0.001

4100-4300 m

624

273(38.9)

1.38

3.99

3.03-5.25

< 0.001

   Deployment type

      

Normal by land (ref.)

797

118(15.4)

 

1.00

  

Emergency by land

566

216(30.9)

0.69

2.00

1.58-2.53

< 0.001

Normal by air

240

90(30.0)

0.66

1.94

1.43-2.65

< 0.001

Emergency by air

166

72(38.3)

0.91

2.48

1.75-3.51

< 0.001

   Travel season

      

Warm (ref.)

998

301(21.6)

 

1.00

  

Cold

771

265(26.2)

0.19

1.21

0.99-1.48

0.060