Table 3 Inter-method reliability using intra-class correlation coefficient reliability index between direct acid-hydrolysis method, modified direct acid-hydrolysis method, and Taves acid diffusion analysis for estimated total soluble fluorides.

From: Inter-method reliability for determining total and soluble fluorides in child low-fluoride formula dentifrices

Total soluble fluorides

Group

ICC

95% CI—LL

95% CI—UL

p value

Single measures

Measurement type: consistency

 DM–TAD

0.85

0.75

0.92

 < 0.001

 MDM–TAD

0.93

0.88

0.96

 < 0.001

 DM–MDM

0.96

0.92

0.98

 < 0.001

Measurement type: absolute agreement

 DM–TAD

0.61

− 0.09

0.86

 < 0.001

 MDM–TAD

0.84

0.08

0.95

 < 0.001

 DM–MDM

0.88

0.10

0.97

 < 0.001

Average measures

Measurement type: consistency

 DM–TAD

0.92

0.85

0.96

 < 0.001

 MDM–TAD

0.97

0.94

0.98

 < 0.001

 DM–MDM

0.98

0.96

0.99

 < 0.001

Measurement type: absolute agreement

 DM–TAD

0.75

− 0.19

0.93

 < 0.001

 MDM–TAD

0.91

0.14

0.97

 < 0.001

 DM–MDM

0.94

0.18

0.98

 < 0.001

  1. ICC intra-class correlation coefficient, CI confidence interval, LL lower limit, UL upper limit; p < 0.05 is significant.
  2. ICC measures interpretation: 0.00 to 0.20: slight; 0.21 to 0.40: fair; 0.41 to 0.60: moderate; 0.61 to 0.80: substantial; and 0.81 to 1.00: almost perfect correlation.
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