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Table 1 Oral health knowledge: Data and crude statistical comparisons (X2) between 1985 & 1996

From: Advances in oral health knowledge of Greek navy recruits and their socioeconomic determinants

Year Educational Status Statistic
  High Medium Low  
Q1. Gingival bleeding considered normal (positive answer)
1985 187 (59.2%) 397 (63.7%) 412 (72.0%) X2 = 10.8
1996 150 (47.9%) 289 (54.9%) 311 (75.1%) P-value = 0.001
Q2. Gingivitis is the cause of loosing teeth (positive answer)
1985 102 (32.3%) 83 (13.3%) 69 (12.1%) X2 = 49.6
1996 119 (38.0%) 84 (16.0%) 147 (35.5%) P-value < 0.001
Q3. Chewing hard foods cause gingival bleeding (positive answer)
1985 122 (59.2%) 218 (63.7%) 331 (72.0%) X2 = 8.4
1996 94 (47.9%) 170 (54.9%) 224 (75.1%) P-value = 0.004
Q4. Knowing what gingivitis is (positive answer)
1985 89 (28.2%) 38 (6.1%) 30 (5.2%) X2 = 678.9
1996 270 (86.3%) 273 (51.9%) 170 (41.1%) P-value < 0.001
Q5. Toothpaste (by itself) treat gingivitis (positive answer)
1985 108 (34.2%) 293 (47.0%) 378 (66.1%) X2 = 18.2
1996 81 (25.9%) 215 (40.9%) 248 (59.9%) P-value < 0.001
Q6. Toothpicks alone are sufficient to clean teeth (positive answer)
1985 82 (75.9%) 183 (29.4%) 358 (62.6%) X2 = 343.1
1996 19 (6.1%) 42 (19.5%) 62 (25.0%) P-value < 0.001
Q7. Selecting the best combination of devices to clean teeth
1985 18 (5.7%) 24 (3.9%) 10 (1.7%) X2 = 10.8
1996 92 (29.4%) 75 (14.3%) 32 (7.7%) P-value = 0.001