See below:
Observation #1: staying out of the dog's yard will reduce your chances of fatal injury by more than 50%
Observation #2. Castrated dogs are more mellow than intact dogs. Go figure.

http://www.fataldogattacks.com/statistics.html
"FATAL DOG ATTACKS"
The Stories Behind the Statistics
by Karen Delise

THE STATISTICS - FATAL DOG ATTACKS IN THE U.S. FROM 1965 - 2001 *

The study covers 431 documented human fatalities from a dog attack.

Location of Attack
25% of all fatal attacks were inflicted by chained dogs
25% resulted from dogs loose in their yard
23% occurred inside the home
17% resulted from attacks by dogs roaming off their property
10% involved leashed dogs or miscellaneous circumstances

Number of Dogs
68% of all fatal attacks were inflicted by a single dog
32% was the result of a multiple dog attack

Victim Profile
79% of all fatal attacks were on children under the age of 12
12% of the victims were the elderly, aged 65 - 94
9% of the victims were 13 - 64 years old

The age group with the highest number of fatalities were children under the age of 1 year old; accounting for 19% of the deaths due to dog attack. Over 95% of these fatalities occurred when an infant was left unsupervised with a dog(s).

The age group with the second-highest number of fatalities were 2-year-olds; accounting for 11% of the fatalities due to dog attack. Over 87% of these fatalities occurred when the 2-year-old child was left unsupervised with a dog(s) or the child wandered off to the location of the dog(s).

Boys aged 1 - 12 years old were 2.5 times more likely to be the victim of a fatal dog attack than girls of the same age.

Breeds Involved
Pit Bull and Pit-bull-type dogs (21%), Mixed breed dogs (16%),
Rottweilers (13%), German Shepherd Dogs (9%), Wolf Dogs (5%),
Siberian Huskies (5%), Malamutes (4%), Great Danes (3%),
St. Bernards (3%), Chow Chows (3%), Doberman Pinschers (3%),
other breeds & non-specified breeds (15%).

Reproductive Status of Dogs
Overwhelmingly, the dogs involved in fatal dog attacks were unaltered males.
From 2000-2001 there were 41 fatal dog attacks. Of these, 28 were attacks by a single dog and 13 fatalities were caused by multiple dogs.