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Table 3 Association between the number of teeth lost due to periodontal disease during SPT and periodontal risk factors at the start of SPT (Cox proportional hazards model)

From: Predictive factors for tooth loss during supportive periodontal therapy in patients with severe periodontitis: a Japanese multicenter study

Start of SPT

Total

Teeth loss due to periodontal disease during SPT

HR

95% CI

p value

Variables

n

Person-years

Rate

Age

  ≤ 34

5

1

14.2

0.0706

1.00

 

 35–44

20

3

101.5

0.0296

0.36

0.04–3.57

0.380

 45–54

27

9

138.0

0.0652

0.76

0.09–6.33

0.796

 55–64

24

2

122.4

0.0163

0.20

0.02–2.30

0.198

  ≥ 65

6

1

26.8

0.0373

0.46

0.03–7.51

0.586

Diabetes

 Non-DM

80

16

398.1

0.0402

1.00

 

 DM

2

0

4.8

0.0000

0.05

0.00–6.27 × 107

0.777

Smoking history

 Non-smoker

62

11

301.2

0.0365

1.00

  

 Smoker

20

5

101.8

0.0491

1.41

0.49–4.09

0.522

Number of sites with of PD ≥ 6 mm

  < 8

80

16

396.7

0.0403

1.00

 

  ≥ 8

2

0

6.3

0.0000

0.05

0.00–3.81 × 106

0.743

BOP

  < 25%

69

13

356.9

0.0364

1.00

 

  ≥ 25%

13

3

46.0

0.0652

2.31

0.61–8.82

0.219

Bone loss/age ratio

  < 1.0

25

4

116.9

0.0342

1.00

 

  ≥ 1.0

57

12

286.0

0.0420

1.21

0.39–3.76

0.742

Number of teeth lost

  < 8

66

10

335.1

0.0298

1.00

 

  ≥ 8

16

6

67.8

0.0885

2.86

1.02–8.01

0.046

MPRA

 Low risk

27

1

153.7

0.0065

1.00

 

 Moderate risk

34

9

161.1

0.0559

8.73

1.10–69.09

0.040

 High risk

21

6

88.2

0.0681

11.04

1.31–93.37

0.027

TRP assessment

 Favorable

61

8

296.6

0.0270

1.00

 

 Poor

21

8

106.3

0.0752

2.79

1.05–7.44

0.040

  1. HR hazard ratio, CI confidence interval, DM diabetes mellitus, PD probing depth, BOP bleeding of probing, MPRA modified periodontal risk assessment, TRP therapy-resistant periodontitis