Table 1.

Proportion of pregnancy outcomes stemming from unintended pregnancies and cost of each outcome to the NHS

	Birth	Induced abortion	Spontaneous abortion	Ectopic pregnancy
Proportion unintended[13]	12%	90%	8%	8%
Cost per event[4,7,18]	£1,579 a ($2,455)	£919 ($1,422)	£375 ($580)	£2,426 ($3,758)

This is the cost of an unwanted birth. The cost of an unintended birth in Table 2 is the weighted average of the costs of unwanted and mistimed births: £1,579 (1-f/(1=r)^d, where f is the fraction mistimed among unintended births, r is the discount rate, and d is the number of years the mistimed birth would have been delayed; f and d are age-specific.