I don't know. I'm not sure there are any reliable or recent studies on that since gun laws are changing so frequently these days. I did find this:

Weapon involvement in home invasion crimes
A. L. Kellermann, L. Westphal, L. Fischer and B. Harvard
Center for Injury Control, Rollins School of Public Health of Emory University, Atlanta, Ga 30322, USA.

OBJECTIVE--To study the epidemiology of home invasion crimes and determine the frequency with which firearms are used to resist these crimes. DESIGN--Prospective case series. SETTING--Atlanta, Ga (population 402,877). METHODS--Between June 1 and August 31, 1994; Atlanta Police Department reports were screened to identify every case of unwanted entry into an occupied, single-family dwelling. Cases of sexual assault and incidents that involved cohabitants were excluded. RESULTS--A total of 198 cases were identified during the study interval. Half (99 cases) involved forced entry into the home. The victim and offender were acquainted in one third of cases. A firearm was carried by one or more offenders in 32 cases (17%). Seven offenders (3.5%) carried knives. In 42% of cases, the offender fled without confronting the victim. Victims who avoided confrontation were more likely to lose property but much less likely to be injured than those who were confronted by the offender. Resistance was attempted in 62 cases (31%), but the odds of injury were not significantly affected by the method of resistance. Forty cases (20%) resulted in one or more victims' being injured, including six (3%) who were shot. No one died. Three victims (1.5%) employed a firearm in self-protection. All three escaped injury, but one lost property. CONCLUSION--A minority of home invasion crimes result in injury. Measures that increase the difficulty of forced entry or enhance the likelihood of detection could be useful to prevent these crimes. Although firearms are often kept in the home for protection, they are rarely used for this purpose.

http://jama.ama-assn.org/cgi/content/abstract/273/22/1759

We had a home invasion event here a few months ago where gang members were being initiated and they broke into an apartment where a soldier slept with a pistol under his bed. Their intent was to kill the homeowner and steal his property as a rite of initiation. Fortunately for the homeowner (and unfortunate for the gang member), he pulled his weapon (hand gun) and shot the firt guy who entered the bedroom which caused the other two to run but they were caught by police.


>Of course not. I don't know about the US, but the cases of home invasion in Canada is pretty low. I'm pretty sure that the risks that pose a loaded gun in a house is much higher than the risk of being rapped/killed/tortured/etc. in a house invasion.
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>>In Canada, whenever someone breaks into a residence is it always only for the purpose of stealing?