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 |