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Table 2 Relative ratio and absolute differences in prevalence of dental scaling non-users by income before and after the national dental scaling insurance policy, Community Health Survey 2010–12 and 2014–16, South Korea, ages 20 and older

From: Does the national dental scaling policy reduce inequalities in dental scaling usage? A population-based quasi-experimental study

Monthly household Income (million KRW)

Relative ratio (95% CI)

Absolute difference % (95% CI)

Pre–policy

(2010–2012)

Post–policy

(2014–2016)

Pre–policy

(2010–2012)

Post–policy

(2014–2016)

Crude

 5 ≤

1

1

0

0

 3–5

1.15 (1.15–1.16)

1.16 (1.16–1.16)

9.0 (8.4–9.5)

8.0 (7.4–8.5)

 1–3

1.27 (1.27–1.28)

1.31 (1.31–1.31)

15.9 (15.4–16.4)

15.1 (14.6–15.6)

 < 1

1.49 (1.49–1.49)

1.62 (1.61–1.62)

28.3 (27.8–28.9)

30.1 (29.6–30.7)

*Adjusted

 5 ≤

1

1

0

0

 3–5

1.11 (1.11–1.11)

1.12 (1.12–1.13)

6.9 (6.9–6.9)

6.6 (6.6–6.6)

 1–3

1.17 (1.16–1.17)

1.20 (1.20–1.20)

10.2 (10.2–10.3)

10.4 (10.3–10.4)

 < 1

1.19 (1.19–1.20)

1.29 (1.29–1.30)

11.9 (11.9–11.9)

15.5 (15.5–15.5)

  1. *A multivariable Poisson regression was used with adjustments for age, sex, residence area, education years, insurance status, current smoking, and subjective oral health