CAL: clinical attachment level; PD: probing depth; SRP: scaling and root planing; SDD: subantimicrobial dose doxycycline, 20 mg/12 hrs; AMOXI-METRO: amoxicillin-metronidazole, 500 mg of each/8 hrs/7 days.
*Tooth sites were stratified according to the degree of disease severity (magnitude of PD) evident at baseline. Tooth sites with a baseline PD of 0 to 3 mm were considered normal, tooth sites with a baseline PD of 4 to 6 mm were considered mildly to moderately diseased; tooth sites with a baseline PD of >7 mm were considered severely diseased.