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Table 5 Findings for discriminant validity in preliminary and field studies

From: Psychometric properties of the Brazilian version of the Early Childhood Oral Health Impact Scale (B-ECOHIS)

Variables Child Impact section Family Impact section
   Mean B-ECOHIS Score (SD)     Mean B-ECOHIS Score (SD)   P- value, Kruskall-Wallis test
  n [Median B-ECOHIS Score] Difference P value Kruskall-Wallis test n [Median B-ECOHIS Score] Difference  
Preliminary study         
Decayed, missing and/or filled teeth         
   None (a) 81 1.2 (2.1)    81 0.4 (1.1)   
   [0.0] a,b*** -   [0.0] a,b*** -
   One or more (b) 69 4.2 (3.7)    69 2.7 (2.5)   
   [4.0]     [2.0]   
Decayed teeth         
   None (a) 90 1.3 (2.1)    90 0.5 (1.2)   
   [0.0]     [0.0]   
   1-3 (b) 36 4.1 (4.0) a,b***; p < 0.001 36 2.3 (2.3) a,b***; p < 0.001
   [3.0] a,c***;    [2.0] a,c***;  
   ≥4 (c) 24 5.2 (3.4) b, cn.s   24 3.7 (2.7) b,c*  
   [5.5]     [2.0]   
Discolored upper anterior teeth         
   None (a) 132 2.2 (3.1)    132 1.1 (1.9)   
   [1.0] a,b*** -   [0.0] a,b*** -
   One or more (b) 18 5.2 (3.5)    18 3.7 (3.1)   
   [5.5]     [3.0]   
Field study         
Decayed, missing and/or filled teeth         
   None (a) 862 1.2 (2.6)    875 0.6 (1.6)   
   [0.0] a,b*** -   [0.0] a,b*** -
   One or more (b) 737 4.5 (5.6)    746 2.7 (3.3)   
   [2.0]     [2.0]   
Decayed teeth         
   None (a) 980 1.4(2.8)    997 0.8 (1.8)   
   [0.0]     [0.0]   
   1-3 (b) 387 3.2 (4.4) a,b***; p < 0.001 389 2.1 (3.0) a,b***; p < 0.001
   [1.0] a,c***;    [0.0] a,c***;  
   ≥4 (c) 232 7.3 (7.0) b,c***   235 4.2 (3.7) b,c***  
   [5.5]     [4.0]   
Discolored upper anterior teeth         
   None (a) 1364 2.5 (4.4)    1381 1.5 (2.7)   
   [0.0] a,b*** -   [0.0] a,b*** -
   One or more (b) 219 3.0 (4.1)    220 2.0 (2.9)   
   [1.0]     [0.0]   
  1. Statistically significant at *p < 0.05, **p ≤ 0.01, ***p ≤ 0.001, based on Mann-Whitney Test; n.s. - Statistically non-significant based on Mann-Whitney Test