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Table 3 Tweedie compound Poisson linear model for the effect of variables on per-capita OOP dental expenditures

From: The effects of orthodontic treatment on personal dental expenditures in South Korea: a follow-up study using Korean health panel survey

 

Coefficient

Exp. (coef.)

P-value

Orthodontic treatment

 Yes

Ref.

  

 No

0.335

1.397

0.134

Sex

 Male

Ref.

  

 Female

0.327

1.386

0.149

Age (years)

 19–29

Ref.

  

 ≥30

0.010

1.010

0.977

Education

 ≤High school

Ref.

  

 ≥College

0.134

1.144

0.581

Employment

 No/do not know

Ref.

  

 Yes

0.128

1.137

0.542

Income level

 Low (Q1)

Ref.

  

 Middle (Q2–Q4)

-0.846

0.429

0.026

 High (Q5)

-0.782

0.457

0.054

Marital status

 No

Ref.

  

 Yes

-0.082

0.921

0.813

Private insurance

 No

Ref.

  

 Yes

-0.021

0.979

0.927

Follow-up period

 (years)

0.180

1.197

<0.001

  1. Q1 1st quintile, Q2–Q4 2nd–4th quintile, Q5 5th quintile
  2. Exp. Exponential, Coef. Coefficient, 95 % CI Confidence interval (95%)
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BMC Health Services Research

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