Factor Total
N
Brushing
N (%)
Using dental floss
N (%)
Overall 9891 8519 (86.1) 2250 (22.7)
Age
< 25 977 936 (95.8) 196 (20.1)
26 - 35 1354 1323 (97.7) 329 (24.3)
36 - 45 1695 1628 (96) 481 (28.4)
46 - 55 1847 1707 (92.4) 536 (29)
56 - 65 1705 1435 (84.2) 371 (21.8)
66 - 75 1330 947 (71.2) 244 (18.3)
> 75 983 543 (55.2) 93 (9.5)
χ2 test P-value < 0.001 < 0.001
Gender
Male 4335 3717 (85.7) 653 (15.1)
Female 5556 4802 (86.4) 1597 (28.7)
χ2 test P-value 0.33a < 0.001
Qualification
No qualifications 2164 1485 (68.6) 233 (10.8)
HNC/D or equivalent or lower 5088 4517 (88.8) 1178 (23.2)
Ordinary degree or higher 2613 2502 (95.8) 835 (32)
χ2 test P-value < 0.001 < 0.001
Body mass index
Underweight 107 84 (78.5) 26 (24.3)
Normal weight 2548 2298 (90.2) 688 (27)
Overweight 2975 2622 (88.1) 657 (22.1)
Obese 2420 2074 (85.7) 517 (21.4)
χ2 test P-value < 0.001 < 0.001
Smoking status
Never 4680 4268 (91.2) 1206 (25.8)
Ex-smoker 2859 2369 (82.9) 655 (22.9)
Current 2326 1857 (79.8) 383 (16.5)
χ2 test P-value < 0.001 < 0.001

aNo statistically significant at the level P < 0.05 (Chi-square test).
N = number of cases; χ2 = Chi-square.