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Table 2 Characteristics of the Dutch population from the Dutch National Oral Health Survey 1995–2013

From: Trends in socioeconomic inequality of periodontal health status among Dutch adults: a repeated cross-sectional analysis over two decades

  1995 2002 2007 2013 P valueb
(n = 917) (n = 795) (n = 669) (n = 702)
Age year, mean (SD) 38.1 (8.1) 40.7 (8.0) 41.1 (8.5) 40.2 (8.6) .000
Age group, n (%)      .000
 25–34 y 353 (38.5) 211 (26.5) 177 (26.5) 217 (30.9)  
 35–44 y 317 (34.6) 310 (39.0) 227 (33.9) 235 (33.5)  
 45–54 y 247 (26.9) 274 (34.5) 265 (39.6) 250 (35.6)  
Gender, n (%)      .000
 Male 450 (49.1) 318 (40.0) 304 (45.4) 284 (40.5)  
 Female 467 (50.9) 477 (60.0) 365 (54.6) 418 (59.5)  
Ethnicity, n (%) a      .000
 Native 831 (91.1) 639 (80.8) 576 (86.5) 636 (90.6)  
 Non-native 81 (8.9) 152 (19.2) 90 (13.5) 66 (9.4)  
Socioeconomic status, n (%)      .000
 Low 579 (63.1) 601 (75.6) 309 (46.2) 264 (37.6)  
 High 338 (36.9) 194 (24.4) 360 (53.8) 438 (62.4)  
Time since the last dental visit, n (%)a      .009
 More than 1 year 57 (6.2) 71 (8.9) 73 (10.9) 63 (9.0)  
 Less than 1 year 859 (93.8) 723 (91.1) 595 (89.1) 638 (91.0)  
Toothbrushing frequency, n (%)a      .000
  <  Once per day 254 (27.7) 218 (27.4) 122 (18.3) 182 (26.0)  
  >  Twice per day 663 (72.3) 577 (72.6) 545 (81.7) 517 (74.0)  
Floss usage, n (%) a      .000
 Non-daily 821 (89.5) 717 (90.2) 561 (84.4) 533 (75.9)  
 Daily 96 (10.5) 78 (9.8v 104 (15.6) 169 (24.1)  
Tooth pick usage, n (%)a      .000
 Non-daily 768 (83.8) 676 (85.0) 541 (81.5) 486 (69.2)  
 Daily 149 (16.2) 119 (15.0) 123 (18.5) 216 (30.8)  
Number of teeth present, mean (SD) 24.1 (5.3) 24.0 (5.4) 25.3 (4.1) 26.4 (3.1) .000
  1. aMissing value for total study, ethnicity, n = 12 (0.4%); dental visit, n = 4 (0.1%); toothbrushing, n = 5 (0.2%); floss, n = 4 (0.1%); tooth pick, n = 5 (0.2%)
  2. bAll P-values were calculated with a two-sided significance level of .05
  3. SD standard deviation