| | |
Estimated age of pubertal onset (years)
|
|---|
| | |
Online (%)
|
Paper (%)
|
Total (%)
|
|---|
| | |
n
|
≤ 11
|
≥ 12
|
P
|
n
|
≤ 11
|
≥ 12
|
P
|
n
|
≤ 11
|
≥ 12
|
P¥
|
|---|
| |
drank alcohol
|
294
|
55.3
|
33.1
|
***
|
392
|
56.6
|
41.7
|
**
|
686
|
56.0
|
38.1
|
***
|
|
Before age
|
was drunk
|
294
|
26.7
|
13.5
|
**
|
390
|
38.9
|
26.2
|
**
|
684
|
33.5
|
20.9
|
***
|
|
14 years,
|
took drugs
|
284
|
11.7
|
2.3
|
**
|
393
|
10.7
|
5.3
|
0.050
|
677
|
11.1
|
4.1
|
**
|
| |
smoked
|
293
|
28.1
|
15.8
|
*
|
392
|
28.9
|
14.9
|
***
|
685
|
28.6
|
15.3
|
***
|
|
Before age
|
had sex
|
292
|
33.5
|
13.0
|
***
|
392
|
40.4
|
19.0
|
***
|
684
|
37.4
|
16.6
|
***
|
|
16 years,
|
had unprotected sex
|
292
|
23.3
|
5.3
|
***
|
390
|
17.7
|
8.0
|
**
|
682
|
20.2
|
6.9
|
***
|
|
∫Took drugs/alcohol at first sex
|
256
|
29.2
|
20.5
|
0.115
|
354
|
36.2
|
37.3
|
0.818
|
610
|
33.1
|
30.6
|
0.494
|
|
$Typical
|
aggression
|
68
|
28.0
|
17.4
|
0.070
|
184
|
56.4
|
41.8
|
*
|
252
|
43.5
|
31.4
|
**
|
|
reactions to
|
ignoring people
|
147
|
49.1
|
51.5
| |
136
|
30.8
|
42.9
| |
283
|
39.0
|
46.6
| |
|
emotional upset
|
moodiness
|
78
|
23.0
|
31.1
| |
52
|
12.8
|
15.3
| |
130
|
17.4
|
22.0
| |
|
Bullying
|
victim
|
294
|
70.2
|
69.2
|
0.851
|
392
|
38.2
|
46.8
|
0.086
|
686
|
52.3
|
56.1
|
0.254
|
| |
perpetrator
|
294
|
40.4
|
33.8
|
0.249
|
388
|
44.1
|
39.2
|
0.337
|
682
|
42.4
|
37.0
|
0.162
|
|
§Frequency
|
Never
|
103
|
30.8
|
40.6
|
*
|
128
|
27.2
|
38.3
|
**
|
231
|
28.8
|
39.3
|
**
|
|
of
|
<1/year
|
91
|
29.6
|
33.1
| |
95
|
23.3
|
25.0
| |
186
|
26.0
|
28.3
| |
|
involvement
|
circa 1/year
|
61
|
23.3
|
18.0
| |
104
|
29.6
|
22.9
| |
165
|
26.8
|
20.9
| |
|
in fighting
|
>1/year
|
37
|
16.4
|
8.3
| |
67
|
19.9
|
13.8
| |
104
|
18.4
|
11.5
| |
|
Time off
|
≤ 10 days
|
237
|
80.5
|
82.6
|
0.651
|
309
|
81.0
|
79.5
|
0.704
|
546
|
80.8
|
80.8
|
0.924
|
|
school/year
|
≥ 11 days
|
54
|
19.5
|
17.4
| |
76
|
19.0
|
20.5
| |
130
|
19.2
|
19.2
| |
- Questions not relating to a specific age refer to adolescence (here measured as the time period post 12 years). *<0.05, **<0.01, ***<0.001, ns = not significant. $Respondents could select only one answer.§Analyses utilised chi squared for a trend. ¥Combined analyses on dichotomised variables utilised a stratified chi-squared design.
- ∫Analyses limited to those individuals who reported ever having had sex.
