2004

(n = 2435)

2006

(n = 1971)

2009

(n = 1934)

2011

(n = 2318)

2015

(n = 2461)

Time trend

p value

Age, years, mean (SD)

14.50 (5.09)

14.21 (5.32)

14.72 (5.59)

13.99 (5.75)

13.71 (5.65)

<0.001

Age groups

6 - 10

484 (19.9)

474 (24.0)

423 (21.9)

643 (27.7)

727 (24.7)

<0.001

11 - 18

1269 (52.1)

925 (46.9)

836 (43.2)

1008 (43.5)

1025 (41.6)

19 - 24

682 (28.0)

572 (29.0)

675 (34.9)

667 (28.8)

709 (28.8)

Gender

Boy

1289 (52.9)

1056 (53.6)

1054 (54.5)

1170 (50.5)

1286 (52.3)

0.093

Girl

1146 (47.1)

915 (46.4)

880 (45.5)

1148 (49.5)

1175 (47.7)

Region

Urban

749 (30.8)

639 (32.4)

566 (29.3)

899 (38.7)

798 (32.4)

<0.001

Rural

1686 (69.2)

1332 (67.6)

1368 (70.7)

1420 (61.3)

1663 (67.6)

Urbanization index

Low;

922 (37.9)

633 (32.1)

464 (24.0)

448 (19.3)

314 (12.8)

<0.001

Medium; P25 - P75

1157 (47.5)

932 (47.3)

1036 (53.6)

1021 (44.0)

1419 (57.7)

High; ≥P75

356 (14.6)

406 (20.6)

434 (22.4)

849 (36.6)

727 (29.6)

BMI, kg/m2, mean (SD)

18.73 (0.07)

18.67 (0.08)

18.85 (0.09)

19.27 (0.10)

19.79 (0.13)

<0.001

Overweight/obesity

No

1856 (88.6)

1486 (86.6)

1403 (84.2)

1708 (79.3)

1460 (75.6)

<0.001

Yes

239 (11.4)

230 (13.4)

264 (15.8)

446 (20.7)

471 (24.4)