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Table 5 Associations between adolescent risk behaviours and age of pubertal onset in males

From: Early pubertal onset and its relationship with sexual risk taking, substance use and anti-social behaviour: a preliminary cross-sectional study

   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  
  1. 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.
  2. ∫Analyses limited to those individuals who reported ever having had sex.