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Table 4 Construct and criterion validity of the OIDP-total scores: mean values for each category of grouping variable and differences in mean rank (DMR). Mann Whitney U test and Kruskal Wallis test.

From: Psychometric properties and the prevalence, intensity and causes of oral impacts on daily performance (OIDP) in a population of older Tanzanians

  Urban (n = 508) Rural (n = 512)
  Mean p DMR Mean p DMR
Oral health status       
Good 2.1    3.6   
Bad 8.9 0.001 142.3 15.6 0.001 167.2
Chewing foods       
All kinds 2.5    5.3   
Soft and mashed only 7.7 0.001 100.0 15.7 0.001 136.2
Decayed teeth       
0–1 2.9    7.5   
2–22 4.9 0.002 37.8 10.4 0.002 38.8
Occluding units       
10 units 1.4    6.4   
0–9 units 4.2 0.001 67.1 9.9 0.001 51.9
Number of missing teeth       
0–10 3.6    8.3   
11–19 4.6    13.3   
20+ 6.2 0.492 26.1 11.0 0.001 59.8
Mobile teeth       
0–1 3.5    8.2   
2 or more 5.3 0.034 35.0 12.1 0.001 57.2