하루 흡연량이 20개비인 경우 치주 질환 위험이 9.99배였고, 흡연 시작 연령은 어릴수록 감소하는 경향이 유의하게 나타났다.
If you smoked 20 cigarettes each and every day, the possibility of periodontal infection had been 9.99 times, as well as the age at which you started smoking decreased significantly.