Table 3.

Proportional Hazards Model: Multivariate hazard ratios of associations between characteristics collected during childhood and later teenage pregnancy

Parameter	Hazard Ratio	95% CI	p value
Family type
Original	1.00 (ref)
Sole-parent	1.10	0.69 - 1.76	0.6934
Step/blended	2.19	1.41 - 3.40	<0.001
CBCL score (child) - Aggressive and
Delinquent
Neither	1.00 (ref)
Aggressive and Delinquent	3.52	1.90 - 6.55	<0.001
Aggressive or Delinquent	1.24	0.71 - 2.14	0.448
Combined carer income
High	1.00 (ref)
Medium	0.93	0.55 - 1.58	0.794
Low	1.72	1.01 - 2.92	0.045
Highest school year completed by primary carer
Year 10 or higher	1.00 (ref)
Year 9 or lower	1.71	1.14 - 2.57	0.009
Region
Metropolitan	1.00 (ref)
Non-Metropolitan	1.52	1.09 - 2.11	0.014
Whether primary carer was a smoker
No	1.00 (ref)
Yes	1.63	1.14 - 2.31	0.007