表 3. Findings of full mouth periodontal examination and questionnaire survey.

全口牙周检查、调查问卷结果

Indicator	Group A (n=115)	Group B (n=54)	Statistic	P
a Median (P25, P75).
Probing depth/mma	3.61 (3.20, 4.33)	4.16 (3.59, 4.67)	z=−3.313	0.001
Bleeding indexa	3.44 (3.03, 3.81)	3.46 (3.07, 3.80)	z=−1.522	0.128
Clinical attachment loss/mma	5.45 (3.96, 7.72)	7.92 (7.01, 9.13)	z=−6.241	<0.001
PD≥4mm percentage/%a	44.14 (17.75, 72.93)	55.71 (43.20, 69.38)	z=−3.311	0.001
Total score of oral health knowledgea	45.50 (40.75, 51.50)	40.50 (36.25, 44.00)	z=−3.728	<0.001
Frequency of tooth brushing≥2 times per day/case (%)	88 (76.52)	33 (61.11)	χ2=3.327	0.038
Ultrasonic scaling≥1 time per year/case (%)	8 (6.96)	0 (0)	χ2=3.943	0.047