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The introduction of 20 mph (32 km per hour) zones in London has saved lives, especially those of children (BMJ 2009;339:b4469; see also editorial, ibid: b4743). Police data have been used to assess the effect of these zones, with traffic calming measures such as speed humps and chicanes, on road casualties. The establishment of 20 mph zones was followed by a 42% reduction in casualties and a halving of deaths or serious injuries in children up to the age of 15 years. There was no evidence of displacement of collisions and casualties to roads outside the 20 mph zones. It is calculated that the zones prevent over 200 casualties and 27 deaths or serious injuries each year. The reductions in injury achieved in 20 mph zones are equivalent to what has taken 20 years to achieve on other roads.
People who survive childhood cancer are more likely to experience a variety of later problems including new malignancies, endocrine problems, and delays in growth and development. A multicentre study in the USA (BMJ 2009;339:b4606, see also editorial, ibid: b4691) has drawn attention to the risk of heart disease. The questionnaire study included 14358 survivors (median age 27 years, range 8–51 years) who had had cancer diagnosed at a median age of 6 years (range 0–20 years). A comparison group consisted …