Characteristics of study subjects in 2002 and 2011, by age group
| 2002 | 2011 | |||
|---|---|---|---|---|
| Characteristics | Aged 12–15 years | Aged 16–18 years | Aged 12–15 years | Aged 16–18 years |
| Total number of patients | 23 714 | 20 818 | 18 414 | 16 262 |
| Number of patients with hormonal contraceptive prescription | 794 | 5341 | 968 | 5629 |
| Average number of prescriptions per patient per year* | 2.0 | 2.2 | 2.2 | 2.4 |
| Prevalence of prescribing (95% CI) | 3.3 (3.1–3.6) | 25.7 (25.0–26.3) | 5.2 (4.9–5.5) | 34.6 (33.7–35.5) |
*Duration of each prescription is 6 months in line with clinical practice in the UK.
CI, confidence interval.