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Table 3 Chi2 associations between early sexual initiation and sociodemographics by gender, and adjusted odds ratios (95% confidence intervals) for the association between very early sexual intercourse and sociodemographic and lifestyle characteristics by gender

From: Sexual intercourse, age of initiation and contraception among adolescents in Ireland: findings from the Health Behaviour in School-aged Children (HBSC) Ireland study

  Chi2 association between early sexual initiation and sociodemographic characteristics Adjusted odds ratios (95% confidence intervals) or the association between very early sexual initiation (<  14 years) and sociodemographic and lifestyle characteristics
  Boys (n = 423) % (n) Girls (n = 300) % (n) Boys (n = 307) Girls (n = 237)
  Very early initiation Early initiation Very early initiation Early initiation (EXP B) OR 95% C.I. for EXP (B) (EXP B) OR 95% C.I. for EXP (B)
(n = 141) (n = 282) (n = 59) (n = 241)
Age
 15 years 42.2 (89)*** 57.8 (122) 20.2 (26)* 79.8 (103) 0.774 0.457–1.310 0.819 0.439–1.529
 16 years 21.3 (30) 78.8 (111) 11.4 (12) 88.6 (93)     
 17 years 29.7 (19) 70.3 (45) 30.4 (17) 69.6 (39)     
 18 years 42.9 (3) 57.1 (4) 40.0 (4) 60.0 (6)     
Social Class (SES)
 Low 26.3 (15) 73.7 (42) 21.4 (9) 78.6 (33) 1.456 0.598–3.543 1.885 0.527–6.742
 Middle 28.8 (44) 71.2 (109) 17.1 (20) 82.9 (97) 0.985 0.426–2.280 1.144 0.331–3.955
 High 36.4 (44) 63.6 (77) 19.8 (18) 80.2 (73) 1(ref)   1(ref)  
Family affluence (FAS)
 Low 34.0 (17) 66.0 (33) 31.0 (13) 69.0 (29) 1(ref)   1(ref)  
 Middle 29.5 (49) 70.5 (117) 17.8 (23) 82.2 (106) 0.952 0.489–1.854 1.048 0.408–2.692
 High 30.9 (55) 69.1 (123) 17.4 (21) 82.6 (100) 0.775 0.276–2.175 0.812 0.167–3.941
Urban/rural status
 Urban 27.8 (72)* 72.2 (187) 16.0 (31)* 84.0 (163) 1(ref)   1(ref)  
 Rural 42.1 (69) 57.9 (95) 26.4 (28) 73.6 (78) 2.640** 1.303–5.347 3.107* 1.061–9.105
Traveller statusb
 Traveller 68.0 (17)*** 32.0 (8) 33.3 (3) 66.7 (6) 1(ref)   1(ref)  
 Non-traveller 30.6 (120) 69.4 (272) 19.2 (55) 80.8 (232) 0.418 0.091–1.914 14.565* 1.489–142.450
Disability/Chronic illness (D/CI)
 D/CI 36.2 (34) 62.3 (60) 22.7 (15) 77.3 (51) 1(ref)   1(ref)  
 No D/CI 32.2 (104) 67.8 (219) 18.8 (43) 81.2 (186) 0.592 0.286–1.228 0.549 0.177–1.698
Household composition
 Living with both parents 33.2 (89) 66.8 (179) 16.8 (31) 83.2 (153) 1(ref)   1(ref)  
 Not living with both parents 33.6 (51) 66.4 (101) 24.3 (28) 75.7 (87) 1.109 0.539–2.280 1.781 0.759–4.183
Lifestyle characteristics
 Positive lifestyle behaviours
  Frequency of physical activity      0.945 0.693–1.288 0.686 0.428–1.101
  Active travel      1.151 0.857–1.546 0.882 0.553–1.407
  Eating breakfast      0.912 0.689–1.208 0.946 0.580–1.543
  Healthy food consumption      0.966 0.703–1.328 1.094 0.703–1.703
  Health protective behaviour      0.895 0.711–1.127 0.859 0.548–1.347
 Negative lifestyle behaviours
  Alcohol involvement      1.303* 1.040–1.632 1.345 0.882–2.052
  Cannabis involvement      1.239a 0.998–1.537 1.634** 1.185–2.254
  Unhealthy food from parents      1.423* 1.026–1.974 0.867 0.511–1.471
  Tobacco involvement      0.930 0.726–1.193 1.321 0.909–1.921
  Unhealthy food consumption      1.137 0.826–1.565 1.118 0.741–1.686
 Health
  Experience of health symptoms      0.599** 0.416–0.863 0.932 0.647–1.342
  Quality of life      1.054 0.766–1.451 1.084 0.683–1.720
  Medication for physical symptoms      0.986 0.750–1.297 0.613* 0.414–0.908
  Medication for psychological symptoms      1.296* 1.036–1.621 0.935 0.630–1.386
Socio-cultural environment
 Communication with friends      0.709** 0.552–0.911 0.987 0.576–1.692
 Sense of community      1.191 0.893–1.588 1.248 0.802–1.943
 Poor neighbourhood environment      0.834 0.625–1.111 1.429 0.912–2.238
 Bullying others      1.216a 0.988–1.496 1.609* 1.110–2.333
 Music and drama      1.131 0.743–1.170 0.984 0.623–1.556
 Being bullied      1.103 0.835–1.458 1.626* 1.085–2.436
 Club or team activities      1.156 0.862–1.551 0.968 0.653–1.434
 Parental communication      0.865 0.606–1.234 0.875 0.518–1.479
 Health check ups      0.790 0.580–1.076 0.369*** 0.234–0.582
  1. a≤.1, * p ≤ .05; ** p ≤ .01; *** p ≤ .001. Nagelkerke R2 = 0.173 (Boys), Nagelkerke R2 = 0.187 (Girls)
  2. bCaution must be taken when extrapolating from this finding given the small sample size