2004

(n = 2435)

2006

(n = 1971)

2009

(n = 1934)

2011

(n = 2318)

2015

(n = 2461)

Time trend

p value

Watching TV

In continuous (hrs/d)

1.39 (1.12)

1.49 (1.09)

1.49 (1.12)

1.36 (1.04)

0.98 (1.06)

<0.001

In categorical

<0.001

Yes

2206 (93.2)

1810 (94.0)

1747 (94.6)

2105 (92.1)

1669 (85.2)

No

160 (6.8)

115 (6.0)

99 (5.4)

180 (7.9)

290 (14.8)

Video games

In continuous (hrs/d)

0.06 (0.29)

0.07 (0.31)

0.06 (0.27)

0.07 (0.29)

0.09 (0.39)

0.003

In categorical

0.001

Yes

228 (9.7)

174 (9.1)

150 (8.1)

249 (10.9)

230 (11.8)

No

2131 (90.3)

1747 (90.9)

1696 (91.9)

2035 (89.1)

1727 (88.2)

Surfing Internet

In continuous (hrs/d)

-

0.13 (0.44)

0.19 (0.50)

0.27 (0.59)

0.21 (0.57)

<0.001

In categorical

<0.001