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Table 3 Summary of responses to "Oral hygiene" and their relationship with plaque score

From: Assessment of oral self-care in patients with periodontitis: a pilot study in a dental school clinic in Japan

Oral hygiene Items Responses and binarization† Relationship with plaque score
1. Frequency of brushing (per day)   P = 0.0354
   none 0 (0)  
   1x 4 (6)  
   2x 22 (34)  
   3x 29 (45)  
   4x or more 10 (15)  
2. Use of tooth paste   ND
   Yes 61 (95)  
   No 3 (5)  
3. Approximal cleaning (use of dental floss or interdental brush)   P = 0.0232
   Yes 39 (60)  
   No 26 (40)  
4. Use of mouthwash or other products   NS
   Yes 25 (38)  
   No 40 (62)  
  1. Values are expressed in n (%).
  2. † Responses were grouped into two (as separated by dotted line) and compared with two categories of PCR (≥ 40% vs. < 40%) by Fisher's exact test. P-values less than 0.05 were considered statistically significant.
  3. NS; not significant
  4. ND; not determined