A few years ago a statistical study of murders in New York City highlighted some interesting trends. The study, covering all 1622 murders that occurred between 2003-2005, found that men (including boys) were responsible for 93% of all murders.
Victims tended to be other men and boys and in more than 50% of cases the attacker and the victim knew each other. 75% of victims and offenders were also of the same race. 90% of killers and 50% of victims had criminal records. In other words, Joe Average has very little chance of being randomly killed in New York City.
The most likely time to be killed was between 1am-2am and children are usually
killed by a parent not a stranger. Age 10 is the safest age for kids because they tend to be too old to be abused or neglected and too young to get caught up in violence on the street. The most alarming adult crime trend was that 25% of murders were committed by complete strangers, usually due to a dispute of some kind. This was up 50% on 50 years previously. As for why (and why the overall murder rate had declined), the answer was primarily social factors. Crime ere generally the result of local poverty, family disruption, poor schools and a lack of recreational or work opportunities.