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Table 4 The differences of the contents of intracellular and extracellular fluid between participants whose TFI achieve AIa or not

From: Association between the content of intracellular and extracellular fluid and the amount of water intake among Chinese college students

  N (%) ICF (kg) ICF/BW (%) ECF (kg) ECF/BW (%) TBW (kg) TBW/BW (%) ECF/ICF (%)
Total <AI 127 (81.4%) 20.3 [17.6,24.4] 34.1 ± 4.0 12.3 [10.7,14.4] 20.6 ± 2.3 32.7 [28.3,38.4] 54.8 ± 6.3 60.4 ± 16.8
≥AI 29 (18.6%) 23.2 [17.2,25.5] 35.4 ± 3.5 13.6 [10.6,15.1] 21.4 ± 2.2 37.0 [27.8,40.4] 56.9 ± 5.7 61.0 ± 16.7
Statistical value (t/Z/χ2)   −0.863b −1.566c − 0.945b − 1.717c − 0.884b −1.632c − 1.663c
p   0.388 0.119 0.344 0.088 0.377 0.105 0.098
Males <AI 65 (81.3%) 24.0 [22.2,26.3] 37.1 [34.3,39.2] 14.4 [13.4,15.5] 22.0 [20.6,23.1] 38.3 [35.7,41.9] 54.8 ± 6.3 60.4 ± 16.8
≥AI 15 (18.8%) 24.8 [23.9,26.9] 38.8 [35.9,40.5] 15.1 [14.6,16.1] 22.9 [21.6,24.2] 39.9 [38.7,43.4] 56.9 ± 5.7 61.0 ± 16.7
Statistical value (t/Z/χ2) 0.003 d −1.985b −1.570b −2.134b −1.447b −2.053b −1.632c − 1.663c
p 0.958 0.047 0.116 0.033 0.148 0.040 0.105 0.098
Females <AI 62 (81.6%) 17.5 [15.9,18.5] 31.6 [30.0,33.3] 10.6 [9.8,11.4] 19.3 [18.4,20.5] 28.2 [25.8,29.9] 50.8 ± 3.3 60.4 ± 17.1
≥AI 14 (18.4%) 17.2 [16.4,18.4] 31.7 [30.6,34.0] 10.6 [10.1,11.1] 19.5 [18.6,20.6] 27.8 [26.8,29.5] 53.5 ± 5.0 61.3 ± 16.4
Statistical value (t/Z/χ2)   −0.08b −0.484b −0.013b −0.563b −0.040b −1.947b −1.773c
p   0.936 0.628 0.989 0.573 0.968 0.070 0.080
  1. Note: ICF Intracellular fluid, ECF Extracellular fluid, TBW Total body water. a; TFI was compared with the recommendation for the adequate water intake (AI) for TFI set by Chinese Nutrition Society (2013) (adult male: 1700 mL; adult female: 1500 mL). Mean and standard deviation (SD) was used to describe variables in normal distribution; percentile (P50 [P25, P75]) was used to describe variables in skewness distribution; and count data were presented as n (percentage). b, means the statistical value Z of Kruskal-Wallis test for comparison of indexes between sexes. c, means the statistical value t of Student’s t-test for comparison of indexes between sexes. d, means the statistical value χ2 of χ2 test for comparison of indexes between sexes