Data were drawn from the 2009 National Youth Reproductive Health Survey, which collected background information and age at sexual debut from 22,300 unmarried youth aged 15–24.
Life table analysis was used to estimate the gender-specific distributions of sexual debut by age, according to urban or rural residence and by region.
Sexual debut before age 18 was rare for both genders, and ages 21–24 appear to be the normative range for sexual debut.
Life table analysis found that debut was earlier for males than for females, for those living in a rural area than for those in urban areas, and for those living in western China than for those in other regions.
Police said the details of the exercise were not revealed to keep it as “authentic as possible” but many residents felt they should have been notified in advance.
Norfolk’s new police and crime commissioner, Lorne Green, attended part of the exercise but was not present when the helicopter was on the scene.
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A training exercise designed to test the readiness of 999 crews in the event of an attack in Norwich left many residents angry after they were woken in the middle of the night by the commotion it caused.
The noise of a low-flying helicopter as it hovered near Norwich Cathedral before landing in the playing field at Norwich School nearby was at the root of much of the disturbance.
In many Western societies, the age at sexual debut began to decline during the 1970s with the relaxation of attitudes about premarital sex.
The decline in the age at debut and the increase in the proportion of youth who have had sexual intercourse generated considerable research interest in the social and demographic characteristics associated with sexual debut; for example, there is substantial variation in the timing of debut between males and females, by ethnic or racial group, and by social class.