Skip to main content

Advertisement

Table 4 The results of subgroup analysis for survival analysis, negative binomial regression, and regression by pre-dental care and patient age

From: The differences in healthcare utilization for dental caries based on the implementation of water fluoridation in South Korea

Sub group   Variables Dental visitsa Only patient with dental care visit
Number of dental care visitsb Dental care costs (KRW)c
HR 95 % CI P-value β SE P-value β SE P-value
Experience of pre-dental care in previous year With Water fluoridation      0.043 0.041 0.2901 0.064 0.047 0.1712
Period from implementation of water fluoridation      −0.007 0.004 0.0689 −0.003 0.004 0.4521
Without Water fluoridation     0.031 0.015 0.0424 −0.009 0.018 0.6180
Period from implementation of water fluoridation      −0.002 0.001 0.0959 −0.004 0.002 0.0115
Income (percentile) −50 % Water fluoridation 0.934 0.900 0.968 0.0002 −0.0532 0.0247 0.0315 −0.0106 0.0288 0.7131
Period from implementation of water fluoridation 1.001 0.996 1.006 0.6484 −0.0004 0.0022 0.8424 −0.0026 0.0025 0.2927
51 % Water fluoridation 0.957 0.930 0.985 0.0032 −0.0083 0.0178 0.6422 0.0173 0.0212 0.4162
Period from implementation of water fluoridation 0.997 0.993 1.000 0.0792 −0.0050 0.0016 0.0014 −0.0056 0.0018 0.0020
−19 Water fluoridation 0.941 0.906 0.976 0.0013 −0.0086 0.0232 0.7117 0.0048 0.0276 0.8617
Period from implementation of water fluoridation 0.996 0.992 1.001 0.1132 −0.0070 0.0021 0.0007 −0.0054 0.0025 0.0270
Age group 20–39 Water fluoridation 0.959 0.922 0.998 0.0408 −0.0113 0.0263 0.6675 0.0274 0.0309 0.3755
Period from implementation of water fluoridation 1.001 0.996 1.006 0.8145 −0.0034 0.0023 0.1495 −0.0068 0.0027 0.0104
40–59 Water fluoridation 0.952 0.908 0.999 0.0461 −0.0568 0.0301 0.0595 −0.0211 0.0352 0.5493
Period from implementation of water fluoridation 1.000 0.994 1.006 0.9847 −0.0001 0.0026 0.9676 −0.0025 0.0029 0.3957
60+ Water fluoridation 0.912 0.840 0.991 0.0297 −0.0518 0.0465 0.2648 0.0010 0.0568 0.9864
Period from implementation of water fluoridation 0.998 0.987 1.010 0.7551 0.0022 0.0039 0.5666 0.0008 0.0048 0.8707
  1. The reference level of water fluoridation was that of regions without a program, and the period since the implementation of water fluoridation was a continuous variable
  2. The bold face indicates statistically significant results
  3. These were results of sub group analyses for survival analysis and negative binomial regression analyses
  4. aThe survival analysis using cox proportional hazard models was applied to investigate the association with the risk of dental care visits
  5. bThe negative binomial regression using GEE model was performed for patients who had experienced a dental care visit at least once per year to investigate the associations with dental care visits.
  6. cThe regression using GEE model was performed for patients who had experienced a dental care visit at least once per year to investigate the associations with dental care costs