| 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 |