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Table 2 Means and standard deviations of each continuous individual variable in CMS and non-CMS subjects in 2009 and 2010

From: Burden of disease resulting from chronic mountain sickness among young Chinese male immigrants in Tibet

Variable Mean (SD)
2009 2010
Age (years)   
CMS 23.45 (3.73)* 23.31 (3.57)*
Non-CMS 22.51 (2.95) 22.61 (3.46)
Body mass index (kg/m 2 )   
CMS 21.69 (2.56) 21.56 (2.78)
Non-CMS 21.42 (2.65) 21.48 (2.51)
Highland service years   
CMS 4.24 (3.33)* 4.10 (3.24)*
Non-CMS 3.44 (2.66) 3.53 (2.98)
Systolic blood pressure (mmHg)   
CMS 120.98 (11.47)* 121.77 (10.74)*
Non-CMS 116.96 (10.27) 118.41 (9.45)
Diastolic blood pressure (mmHg)   
CMS 77.31 (11.32)* 78.30 (12.67)*
Non-CMS 75.07 (7.65) 73.80 (7.78)
Heart rate (beat/min)   
CMS 81.17 (10.74)* 80.06 (8.53)*
Non-CMS 76.63 (8.13) 77.07 (8.02)
Hemoglobin (g/L)   
CMS 216.68 (5.62)* 216.10 (5.74)*
Non-CMS 191.05 (12.69) 190.94 (13.54)
Oxygen saturation (%)   
CMS 82.45 (2.69)* 81.69 (2.41)*
Non-CMS 88.85 (3.43) 89.01 (3.50)
  1. SD: standard deviation; CMS: chronic mountain sickness.
  2. *: p < 0.05 vs. control based on ANOVA; †: CMS n = 321, non-CMS n = 642; ‡: CMS n = 315, non-CMS n = 630.