Deadbolts are surprisingly flimsy. The weak point is the door frame, easily kicked in. You may want to reinforce that area and get a door brace bar.
Bingo! I had a burglar kick in my front door while the family was at school and work. My monitored alarm system did its job quite well as they ran when they heard the alarm go off stealing nothing. My neighbor heard a single bang (the burglars kick to my door). A single kick completely exploded my door frame instantly. This left us feeling unsure that we would have the time necessary to get to one of several guns around the house. Now we have installed iron bar doors similar to those sold at home depot for 350 bucks. Now we have time to react.
PS. The inside bar can do the same however the iron bars work while we are gone also.