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Table 1 Oral Health indices. The UNRWA oral health surveys 2011 and 2016

From: Oral health status and caries trend among 12-year old Palestine refugee students: results from the UNRWA’s oral health surveys 2011 and 2016

  Survey 2011 N = 2781 Survey 2016a N = 1550 p-value*
N N
Present Teeth < 0.01**
 Median (min;max) 28 (15–28) 26 (12–28)  
DS
 Median (min;max) 2 (0–40) 2 (0–32)  
 Mean (Standard Deviation, SD) 3.20 (4.23) 3.29 (3.99) 0.08**
  = 0 (%) 889 (32.0) 474 (30.6) 0.35
  > 0 (%) 1892 (68.0) 1076 (69.4)  
MS
 Median (min;max) 0 (0–15) 0 (0–10)  
 Mean (SD) 0.14 (0.90) 0.22 (1.12) 0.01**
  = 0 (%) 2708 (97.4) 1487 (95.9) 0.01
  > 0 (%) 73 (2.6) 63 (4.1)  
FS
 Median (min;max) 0 (0–18) 0 (0.12)  
 Mean (SD) 0.58 (1.55) 0.48 (1.34) 0.02**
  = 0 (%) 2189 (78.7) 1267 (81.7) 0.02
  > 0 (%) 592 (21.3) 283 (18.3)  
FT
 Median (min-max) Not collected (0–11)  
 Mean (SD) 0.39 (0.98)  
  = 0 (%) 1267 (81.7)  
  > 0 (%) 283 (18.3)  
DMFS
 Median (min;max) 2 (0–40) 3 (0–32)  
 Mean (SD) 3.93 (4.71) 3.99 (4.59) 0.45**
  = 0 (%) 747 (26.9) 421 (27.2) 0.83
  > 0 (%) 2034 (73.1) 1129 (72.8)  
DMFT
 Median (min-max) Not collected 2 (0–21)  
 Mean (SD) 2.52 (2.51)  
  = 0 (%) 421 (27.2)  
  > 0 (%) 1129 (72.8)  
SEALANTS
 Median (min;max) 0 (0–10) 0 (0–9)  
 Mean (SD) 0.20 (0.89) 0.38 (1.32) < 0.01**
  = 0 (%) 2603 (93.6) 1398 (90.2) < 0.01
  > 0 (%) 178 (6.4) 152 (9.8)  
  1. *Pearson’s Chi Square test otherwise specified; **Mann-Whitney non parametric test; a data from Syria excluded