Infant mortality for Dorchester , at 11.4 per thousand , was slightly below the city average of 11.7 .
Life expectancy of the neighborhood 's residents , at 70.2 years , was somewhat shorter than the city average of 70.9 years .
Infant mortality for Dorchester , at 11.4 per thousand , was slightly below the city average of 11.7 , but life expectancy of the neighborhood 's residents , at 70.2 years , was somewhat shorter than the city average of 70.9 years .