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Table 4 Concentration indices for dental caries indices, by small-area material deprivation (Pampalon index)

From: Equity in children’s dental caries before and after cessation of community water fluoridation: differential impact by dental insurance status and geographic material deprivation

Outcome variable

Concentration index which indicates the extent to which the dental caries index is concentrated by small-area deprivationa

2009/10

2013/14

Concentration index (95 % confidence interval), p-value, (n)

Concentration index (95 % confidence interval), p-value, (n)

deft

Conc. index: −0.065 (−0.13 to −003), p = .039*

Conc. index: −0.082 (−0.11 to −0.06), p < .001*

(n = 511)

(n = 2980)

deft if deft > 0

Conc. index: −0.027 (−0.07 to 0.017), p = .23

Conc. index: −0.041 (−.06 to −02), p < .001*

(n = 256)

(n = 1678)

DMFT

Conc. index: −0.14 (−0.31 to 0.04), p = .13

Conc. index: −0.031 (−0.12 to 0.055), p = .48

(n = 505)

(n = 2939)

DMFT if DMFT > 0

Conc. index: −0.08 (−0.17 to .006), p = .067

Conc. index: −0.004 (−.042 to 0.034), p = .84

(n = 48)

(n = 237)

2 or more teeth (permanent or primary) with untreated decay

Conc. index: −0.055 (−0.09 to −0.019), p = .003*

Conc. index: −0.036 (−.048 to −024), p < .001*

(n = 505)

(n = 2939)

  1. deft number of decayed, missing, and filled primary teeth, DMFT number of decayed, missing, and filled permanent teeth
  2. *Statistically significant at p < .05
  3. aConcentration index is bounded by −1 (all problems concentrated in the lowest SES) and +1 (all problems concentrated in the highest SES). Concentration index of zero = perfect equality. Here, a statistically significant negative concentration index indicates that the dental caries outcome is significantly concentrated amongst those with higher material deprivation