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Table 1 Baseline descriptive statistics for individual measurements stratified by gender among Shenzhen children and adolescents (aged 9–17 years), separately based on the diagnostic criteria I and II for elevated ALAT

From: Diagnostic performance of individual characteristics and anthropometric measurements in detecting elevated serum alanine aminotransferase among children and adolescents

Group

Total students

Criterion I (>  30 U/L for boys and > 19 U/L for girls)

Criterion II (>  40 U/L for boys and girls)

Normal ALAT

Elevated ALAT

P-value*

Normal ALAT

Elevated ALAT

P-value*

Overall (n = 7271)

 Age, years

14.7 (12.4–15.7)

14.7 (12.3–15.7)

15.3 (13.8–16.1)

< 0.001

14.7 (12.3–15.7)

15.3 (14.3–16.1)

< 0.001

 Height, m

1.65 (1.59–1.72)

1.64 (1.59–1.71)

1.69 (1.63–1.75)

< 0.001

1.65 (1.59–1.72)

1.73 (1.65–1.78)

< 0.001

 Weight, kg

53.0 (46.7–61.0)

52.2 (46.2–59.8)

70.0 (56.1–83.6)

< 0.001

52.6 (46.5–60.2)

77.7 (63.1–90.1)

< 0.001

 BMI, kg/m2

19.31 (17.63–21.66)

19.15 (17.55–21.23)

24.51 (20.38–27.95)

< 0.001

19.25 (17.59–21.45)

26.39 (22.40–30.22)

< 0.001

 Height-z

0.59 (− 0.18–1.41)

0.58 (− 0.18–1.41)

0.71 (− 0.12–1.47)

0.104

0.59 (− 0.18–1.41)

0.65 (− 0.13–1.48)

0.526

 BMI-z

− 0.01 (− 0.77–0.83)

−0.06 (− 0.81–0.74)

1.40 (0.16–2.27)

< 0.001

−0.04 (− 0.79–0.79)

1.89 (0.85–2.54)

< 0.001

Boys (n = 4014)

 Age, years

14.7 (12.4–15.7)

14.7 (12.3–15.7)

15.4 (14.4–16.1)

< 0.001

14.7 (12.4–15.7)

15.4 (14.6–16.2)

< 0.001

 Height, m

1.69 (1.61–1.75)

1.69 (1.61–1.75)

1.74 (1.68–1.78)

< 0.001

1.69 (1.61–1.75)

1.74 (1.68–1.79)

< 0.001

 Weight, kg

55.4 (48.1–64.7)

54.7 (47.9–63.0)

79.0 (66.9–88.6)

< 0.001

55.0 (48.0–63.7)

81.4 (69.5–92.4)

< 0.001

 BMI, kg/m2

19.37 (17.64–22.04)

19.16 (17.55–21.47)

26.42 (22.98–30.06)

< 0.001

19.26 (17.59–21.70)

27.20 (23.92–30.61)

< 0.001

 Height-z

0.65 (−0.16–1.55)

0.65 (− 0.16–1.55)

0.66 (− 0.16–1.42)

0.086

0.65 (− 0.16–1.55)

0.66 (− 0.12–1.50)

0.857

 BMI-z

0.12 (− 0.74–1.06)

0.04 (− 0.78–0.90)

1.98 (0.99–2.55)

< 0.001

0.07 (−0.77–0.95)

2.14 (1.27–2.67)

< 0.001

Girls (n = 3257)

 Age, years

14.7 (12.3–15.7)

14.7 (12.3–15.7)

15.0 (13.3–16.0)

< 0.001

14.7 (12.3–15.7)

14.6 (13.3–15.4)

0.557

 Height, m

1.62 (1.57–1.67)

1.61 (1.57–1.66)

1.64 (1.58–1.71)

< 0.001

1.62 (1.57–1.66)

1.62 (1.58–1.69)

0.270

 Weight, kg

50.6 (45.2–57.0)

50.1 (45.0–56.0)

58.5 (50.6–71.1)

< 0.001

50.5 (45.2–56.8)

59.0 (48.7–75.6)

< 0.001

 BMI, kg/m2

19.26 (17.60–21.26)

19.13 (17.54–20.98)

21.60 (19.05–25.59)

< 0.001

19.23 (17.60–21.19)

22.01 (18.86–27.12)

< 0.001

 Height-z

0.51 (−0.20–1.32)

0.50 (− 0.20–1.31)

0.82 (− 0.09–1.52)

0.006

0.51 (− 0.20–1.32)

0.40 (− 0.20–1.37)

0.857

 BMI-z

−0.13 (− 0.82–0.61)

−0.16 (− 0.84–0.54)

0.64 (− 0.39–1.60)

< 0.001

−0.14 (− 0.82–0.60)

0.73 (− 0.53–1.80)

< 0.001

  1. Data are expressed as median (interquartile range [IQR]) for the measurements with skewed distributions
  2. * Comparing elevated ALAT to normal ALAT by the Mann–Whitney U test