表 4.

基线及3个月复查时两组菌斑指数结果的比较

Comparison of plaque index results between two groups at baseline and 3 months

Group	n	Baseline, x±s	3 months later, x±s	Change, x±s	P value
Test group	21	0.62±0.66	0.43±0.60	0.19±0.92	0.34
Control group	20	0.85±0.81	0.95±0.76	0.1±0.64	0.69
P value		0.32	0.02	0.25