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Table 3 Weighted estimates from regression (zero-inflated poisson, logistic) to assess associations between Pampalon material deprivation index categories corresponding to provincial tertiles (highest deprivation and middle deprivation versus lowest deprivation) and oral health summary measures, grade 2 students in Calgary, 2009–10 and 2013/14

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 Rate ratio or odds ratio for effect of high or middle material deprivation (vs. low deprivation) on dental caries outcomes (reference = 1.0)
2009/10 2013/14 Interaction terms: RR or OR (95 % CI), p-value (n)
RR or OR (95 % CI), p-value (n) RR or OR (95 % CI), p-value (n)
defta Highest deprivation: RR = 1.07 Highest deprivation: RR = 1.19 Year X Highest deprivation: RR = 1.11
(0.93 to 1.23), p = .34 (1.08 to 1.30), p < .001* (0.95 to 1.30), p = .20
Middle deprivation: RR = 1.03 Middle deprivation: RR = 1.15 Year X Middle deprivation: RR = 1.12
(0.88 to 1.19), p = .73 (n = 511) (1.02 to 1.30), p = .023* (n = 2980) (0.91 to 1.37), p = .27 (n = 3491)
DMFTa Highest deprivation: RR = 1.42 Highest deprivation: RR = 1.04 Year X Highest deprivation: RR = 0.74
(.74 to 2.69), p = .27 (0.68 to 1.59), p = 0.85 (0.36 to 1.50), p = 0.40
Middle deprivation: RR = 1.08 Middle deprivation: RR = 0.80 Year X Middle deprivation: RR = 0.74
(0.61 to 1.91), p = .77 (n = 505) (0.49 to 1.30), p = 0.37 (n = 2939) (0.36 to 1.51), p = 0.41 (n = 3444)
2 or more teeth (permanent or primary) with untreated decayb Highest deprivation: OR = 2.95 Highest deprivation: OR = 2.23 Year X Highest deprivation: OR = 0.75
(0.89 to 9.82), p = .07 (1.66 to 2.98), p < .001* (0.24 to 2.36), p = 0.63
Middle deprivation: OR = 0.90 Middle deprivation: OR = 1.43 Year X Middle deprivation: OR = 1.59
(0.31 to 2.62), p = .83 (n = 505) (1.05 to 1.94), p = .024* (n = 2939) (0.57 to 4.43), p = 0.37 (n = 3444)
  1. deft number of decayed, missing, and filled primary teeth, DMFT number of decayed, missing, and filled permanent teeth, X multiplied by
  2. *Statistically significant effect (at p < .05) of Pampalon material deprivation category (high or middle, versus low) on dental caries outcome
  3. aZero-inflated Poisson regression
  4. bLogistic regression (yes vs. no)