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Table 3 Incidence rate ratios of extractions and restorations by range of co-variates

From: Oral health experiences of individuals with Rett syndrome: a retrospective study

   

Baseline comparison

Covariate

Covariate Subcategory

n (%)

Restorations

Extractionsa

Incidence rate ratio

(IRR; (95% CI) p-value)

Incidence rate ratio

(IRR; (95% CI) p-value)

ARIA+

1 (major cities of Australia)

146 (61.6)

baseline comparison

n = 237

2 (inner regional Australia)

55 (23.2)

(1.40; (0.66–2.97) p = 0.38)

(1.10; (0.61–2.00) p = 0.74)

3 (outer regional Australia)

25 (10.6)

(1.64; (0.59–4.52) p = 0.34)

(1.09; (0.47–2.53) p = 0.84)

4 (remote Australia/very remote Australia)

11 (4.6)

(1.86; (0.44–7.82) p = 0.39)

(0.35; (0.1–1.30) p = 0.12)

Income

Less than $31,200

53 (32.5)

baseline comparison

n = 162

Between $31,200 - $51,999

32 (19.6)

(0.94; (0.32–2.79) p = 0.91)

(0.46; (0.21–1.04) p = 0.06)

Between $52,000 - $77,999

26 (15.9)

(0.87; (0.27–2.82) p = 0.81)

(0.24; (0.09–0.62) p = 0.00)

$78,000 or more

52 (31.9)

(0.81; (0.31–2.11) p = 0.67)

(0.36; (0.17–0.73) p = 0.01)

Mutation

C-terminal

22 (9.4)

baseline comparison

n = 234

Early truncating

16 (6.8)

(1.13; (0.24–5.24) p = 0.88)

(2.06; (0.57–7.47) p = 0.27)

Large deletion

17 (7.3)

(0.94; (0.21–4.26) p = 0.94)

(4.93; (1.46–16.7) p = 0.01)

p.Arg106Trp

11 (4.7)

(0.19; (0.02–1.42) p = 0.11)

(2.68; (0.66–10.92) p = 0.17)

p.Arg133Cys

20 (8.6)

(0.68; (0.16–2.84) p = 0.6)

(2.43; (0.73–8.07) p = 0.15)

p.Arg168*

28 (12.0)

(1.13; (0.31–4.16) p = 0.85)

(1.64; (0.53–5.08) p = 0.39)

p.Arg255*

17 (7.3)

(0.27; (0.05–1.45) p = 0.13)

(2.09; (0.58–7.47) p = 0.26)

p.Arg270*

18 (7.7)

(0.77; (0.18–3.38) p = 0.73)

(2.8; (0.83–9.38) p = 0.1)

p.Arg294*

20 (8.6)

(0.68; (0.16–2.88) p = 0.6)

(1.97; (0.59–6.52) p = 0.27)

p.Arg306Cys

14 (6.0)

(0.94; (0.2–4.42) p = 0.94)

(1.17; (0.31–4.5) p = 0.82)

p.Thr158Met

25 (10.7)

(0.82; (0.21–3.21) p = 0.78)

(1.95; (0.61–6.2) p = 0.26)

Other

26 (11.1)

(1.26; (0.39–4.73) p = 0.73)

(1.44; (0.46–4.47) p = 0.53)

Epilepsy

No

42 (17.6)

baseline comparison

n = 237

Yes

196 (82.4)

(1.39; (0.59–3.26) p = 0.46)

(0.98; (0.51–1.91) p = 0.96)

Reflux

No

174 (73.1)

baseline comparison

n = 238

Yes

64 (26.9)

(0.95; (0.47–1.92) p = 0.88)

(1.04; (0.59–1.83) p = 0.89)

  1. aRefers to number of extracted teeth