Table 5 Interaction of each independent variable in children's DMFT

The rate of S-FMR utilization (per person) (%)

-0.002

(-0.047: 0.0001)

-0.003

(-0.005; -0.001)*

-0.003

(-0.005; -0.001)*

-0.012

(-0.018; -0.005)*

-0.005

(-0.024; 0.015)

-0.003

(-0.005; -0.001)*

Subsidy policy (REF: Co-pay until children enters elementary school)

No co-payment until children enters elementary school

0.079

(-0.150; 0.307)

0.13

(-0.13; 0.39)

0.16

(-1.20; 1.51)

0.05

(-0.08; 0.17)

0.05

(-0.09; 0.18)

0.05

(-0.08; 0.18)

Co-payment continuing beyond elementary school

0.114

(-0.003; 0.230)

0.38

(0.11; 0.65)*

-0.26

(-1.01; 0.49)

0.088

(-0.005; 0.182)

0.08

(-0.02; 0.17)

0.08

(-0.02; 0.18)

SCR of dental sealants

-0.001

(-0.003; -0.00003)*

-0.0005

(-0.0020; 0.0010)

-0.00120

(-0.00244; 0.00006)

-0.0033

(-0.005; -0.002)*

-0.0014

(-0.0026; -0.0001)*

-0.003

(-0.013; 0.007)

Per capita prefectural income (1,000 JPY)

0.00002

(-0.00014; 0.00019)

0.00003

(-0.00012; 0.00018)

-0.00005

(-0.00033; 0.00023)

0.00001

(-0.00014; 0.00017)

0.00004

(-0.00013; 0.00021)

0.000001

(-0.000345; 0.000348)

The rate of Industrial Structure 3 (Service / Commerce) (%)

0.012

(-0.003; -0.00003)

0.012

(-0.001; 0.026)

0.011

(-0.004; 0.025)

0.012

(-0.001; 0.026)

0.012

(-0.002; 0.026)

0.012

(-0.002; 0.027)

Number of families (per household)

-0.189

(-0.0001; 0.0002)

-0.12

(-0.48; 0.24)

-0.12

(-0.49; 0.26)

-0.12

(-0.47; 0.24)

-0.12

(-0.50; 0.26)

-0.11

(-0.49; 0.27)

Percentage of the nuclear family (%)

-0.006

(-0.002; 0.025)

-0.004

(-0.02; 0.012)

-0.004

(-0.02; 0.013)

-0.005

(-0.021; 0.01)

-0.004

(-0.020; 0.013)

-0.003

(-0.020; 0.014)

Percentage of households living with older adults (%)

-0.017

(-0.578; 0.200)*

-0.018

(-0.033; -0.003)*

-0.017

(-0.033; -0.002)*

-0.016

(-0.031; -0.002)*

-0.018

(-0.033; -0.003)*

-0.018

(-0.033; -0.003)*

Total fertility rate (%)

0.412

(-0.023; 0.011)

0.49

(0.11; 0.88)*

0.46

(0.04; 0.87)*

0.44

(0.06; 0.82)*

0.46

(0.05; 0.87)*

0.45

(0.03; 0.87)*

Percentage of college graduates (%)

-0.04

(-0.032; -0.002)*

-0.04

(-0.06; -0.02)*

-0.04

(-0.05; -0.02)*

-0.04

(-0.05; -0.02)*

-0.04

(-0.06; -0.02)*

-0.04

(-0.06; -0.02)*

Percentage of receiving public assistance (%)

0.103

(-0.015; 0.839)*

0.11

(0.04; 0.18)*

0.11

(0.04; 0.17)*

0.11

(0.04; 0.17)*

0.11

(0.04; 0.17)*

0.10

(0.03; 0.17)*

The unemployment rate (%)

0.069

(-0.055; -0.020)*

0.07

(0.03; 0.11)*

0.06

(0.03; 0.10)*

0.07

(0.04; 0.11)*

0.07

(0.03; 0.11)*

0.07

(0.03; 0.11)*

The number of dentists working in private dental office (per 100,000 people)

-0.004

(0.035; 0.171)

-0.003

(-0.007; 0.001)

-0.004

(-0.008; 0.001)

-0.002

(-0.006; 0.002)

-0.003

(-0.008; 0.001)

-0.003

(-0.008; 0.001)

Interaction term policy and S-FMR (REF: Co-pay until children enters elementary school * S-FMR)

No co-payment until children enters elementary school * S-FMR

-0.001

(0.032; 0.106)

Co-payment continuing beyond elementary school * S-FMR

-0.002

(-0.008; 0.0003)

Interaction term policy and dental sealant (REF: Co-pay until children enters elementary school * SCR of dental sealants)

No co-payment until children enters elementary school * S-FMR

-0.0008

(-0.0032; 0.0016)

Co-payment continuing beyond elementary school * S-FMR

-0.0033

(-0.0061; -0.0005)*

Interaction term policy and prefectural income (REF: Co-pay until children enters elementary school * Per capita prefectural income)

No co-payment until children enters elementary school * S-FMR

-0.00003

(-0.00048; 0.00042)

Co-payment continuing beyond elementary school * S-FMR

0.0001

(-0.00014; 0.00037)

Interaction term S-FMR and SCR of dental sealants

0.0001

(0.00003;0.0002)*

Interaction term S-FMR and Per capita prefectural income

0.000001

(-0.00001; 0.00001)

Interaction term SCR of dental sealants and per capita prefectural income

0.0000004

(-0.0000027; 0.0000035)