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Table 2 Effect of Scale and Polish on Gingival Bleeding

From: Clinical outcomes of Single-Visit oral Prophylaxis: A practice-based randomised controlled trial

 

6-month Group

12-month Group

24-month Group

Statistical Test

Prevalence of gingival bleeding

Data available for both baseline and follow up (N = 307)

107

100

100

 

N (%) with any bleeding at follow-up

84 (78.5)

78 (78.0)

82 (82.0)

Χ2 test

P = 0.746

Complete data analysis (N = 307)

Odds Ratio (from Logistic regression)

(95% CI) for follow up adjusted for baseline bleeding

1.00

0.92

(0.47, 1.79)

1.17

(0.59, 2.35)

 

Multiple imputation analysis c (N = 368)

Odds Ratio (from Logistic regression)

(95% CI) for follow up adjusted for baseline bleeding

1.00

0.92

(0.45, 1.89)

1.19

(0.58, 2.47)

 

Proportion of index teeth examined with gingival bleeding d

Complete data analysis (N = 307)

Follow-up % of index teeth with bleeding

Mean (SD)

37.9 (30.3)

38.8 (30.7)

39.8 (30.2)

ANOVA P = 0.896

Follow-up % of index teeth with bleeding adjusted for baseline bleeding

ANCOVA P = 0.979

Multiple imputation analysis c (N = 368)

Follow-up % of index teeth with bleeding adjusted for baseline bleeding

(from linear regression)

P = 0.932

  1. cFollow-up data were imputed using baseline values, gender, age at baseline, deprivation score and randomization group.
  2. dThe percent of index teeth with bleeding was calculated for each participant as the total number of teeth with bleeding over the total number of index teeth examined.