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Table 1 Baseline characteristics between AMS and non-AMS groups

From: The impact of physical fitness and body mass index in children on the development of acute mountain sickness: A prospective observational study

Patient characteristics Total (N = 179) AMS group (n = 80) Non-AMS group (n = 99) p value
Gender     0.004*
Male, n (%) 102 (57%) 55 (68.8%) 47 (47.5%)  
Female, n (%) 77 (43%) 25 (31.2%) 52 (52.5%) 0.300
Mean age, years 11.8 ± 0.4 11.8 ± 0.5 11.8 ± 0.4
Mean body weight, kg 45.0 ± 10.4 48 ± 11.8 42.6 ± 8.4 <0.001*
Mean body height, cm 152.0 ± 7.2 152.6 ± 7.8 151.5 ± 6.6 0.311
Mean body mass indexa, kg/m2 19.4 ± 3.7 20.5 ± 4.2 18.4 ± 2.8 <0.001*
Mean BMI z-scoreb 2.8 ± 0.3 2.8 ± 0.2 2.7 ± 0.3 0.002*
Physical fitness index 67.9 ± 9.7 67.8 ± 10.1 68.0 ± 9.3 0.900
  1. * Significantly different between AMS and non-AMS groups, respectively.
  2. AMS, acute mountain sickness; BMI, body mass index.
  3. aBMI = weight in kilograms divided by the square of the height in meters.
  4. bBMI z-score was calculated as outlined by Center for Disease Control (CDC) guidelines (http://www.cdc.gov/growthcharts/percentile_data_files.htm).
  5. Continuous variable was presented as mean ± SD, and compared the differences between with and without AMS using independent t-test.
  6. Categorical variable was presented as count and percentage, and compared the differences between with and without AMS using Chi-square test.