Table 1.
χ2 test for the relationship between frequency of daily toothbrushing and systemic diseases/disorders in Japanese adolescents.
| Frequency of Daily Toothbrushing | |||||||
|---|---|---|---|---|---|---|---|
| Time(s) | |||||||
| Medical History | ≤1 | 2 | 3≤ | Total | p | ||
| All | n (%) | 1868 (20.6) | 5971 (65.8) | 1233 (13.6) | 9072 (100) | ||
| Pollinosis | Absence | n (%) | 1575 (20.6) | 5037 (65.8) | 1044 (13.6) | 7656 (100) | 0.957 |
| Presence | 293 (20.7) | 934 (66) | 189 (13.3) | 1416 (100) | |||
| Food/Drug allergy | Absence | n (%) | 1809 (20.6) | 5791 (65.8) | 1197 (13.6) | 8797 (100) | 0.923 |
| Presence | 59 (21.5) | 180 (65.5) | 36 (13.1) | 275 (100) | |||
| Inhaled antigen allergy (except pollinosis) | Absence | n (%) | 1827 (20.5) | 5856 (65.9) | 1208 (13.6) | 8891 (100) | 0.766 |
| Presence | 41 (22.7) | 115 (63.5) | 25 (13.8) | 181 (100) | |||
| Allergic rhinitis | Absence | n (%) | 1584 (20.6) | 5070 (65.8) | 1051 (13.6) | 7705 (100) | 0.942 |
| Presence | 284 (20.8) | 901 (65.9) | 182 (13.3) | 1367 (100) | |||
| Otitis media/externa | Absence | n (%) | 1823 (20.5) | 5863 (65.9) | 1208 (13.6) | 8894 (100) | 0.26 |
| Presence | 45 (25.3) | 108 (60.7) | 25 (14.0) | 178 (100) | |||
| Sinusitis | Absence | n (%) | 1832 (20.5) | 5881 (65.9) | 1214 (13.6) | 8927 (100) | 0.444 |
| Presence | 36 (24.8) | 90 (62.1) | 19 (13.1) | 145 (100) | |||
| Pneumothorax/Mediastinal emphysema | Absence | n (%) | 1844 (20.6) | 5896 (65.8) | 1221 (13.6) | 8961 (100) | 0.687 |
| Presence | 24 (21.6) | 75 (67.6) | 12 (10.8) | 111 (100) | |||
| Asthma/Cough variant asthma | Absence | n (%) | 1673 (20.4) | 5412 (66) | 1117 (13.6) | 8202 (100) | 0.376 |
| Presence | 195 (22.4) | 559 (64.3) | 116 (13.3) | 870 (100) | |||
| Atopic dermatitis | Absence | n (%) | 1722 (20.4) | 5559 (65.9) | 1152 (13.7) | 8433 (100) | 0.315 |
| Presence | 146 (22.8) | 412 (64.5) | 81 (12.7) | 639 (100) | |||
| Urticaria | Absence | n (%) | 1832 (20.5) | 5897 (65.9) | 1213 (13.6) | 8942 (100) | 0.077 |
| Presence | 36 (27.7) | 74 (56.9) | 20 (15.4) | 130 (100) | |||
| Scoliosis | Absence | n (%) | 1852 (20.6) | 5933 (65.9) | 1221 (13.6) | 9006 (100) | 0.342 |
| Presence | 16 (24.2) | 38 (57.6) | 12 (18.2) | 66 (100) | |||
| Spondylosis/Spondylolisthesis/Hernia | Absence | n (%) | 1860 (20.6) | 5934 (65.8) | 1224 (13.6) | 9018 (100) | 0.517 |
| Presence | 8 (14.8) | 37 (68.5) | 9 (16.7) | 54 (100) | |||
| Strabismus | Absence | n (%) | 1854 (20.6) | 5924 (65.8) | 1226 (13.6) | 9004 (100) | 0.718 |
| Presence | 14 (20.6) | 47 (69.1) | 7 (10.3) | 68 (100) | |||
| Myopia/Hyperopia/Astigmatism | Absence | n (%) | 1847 (20.5) | 5923 (65.9) | 1218 (13.6) | 8988 (100) | 0.234 |
| Presence | 21 (25.0) | 48 (57.1) | 15 (17.9) | 84 (100) | |||
| Arrhythmia | Absence | n (%) | 1851 (20.6) | 5896 (65.8) | 1218 (13.6) | 8965 (100) | 0.478 |
| Presence | 17 (15.9) | 75 (70.1) | 15 (14.0) | 107 (100) | |||
| Abnormal ECG other than arrhythmia | Absence | n (%) | 1854 (20.6) | 5925 (65.8) | 1224 (3.6) | 9003 (100) | 0.987 |
| Presence | 14 (20.3) | 46 (66.7) | 9 (13.0) | 69 (100) | |||
| Anemia | Absence | n (%) | 1861 (20.7) | 5926 (65.8) | 1224 (13.6) | 9011 (100) | 0.209 |
| Presence | 7 (11.5) | 45 (73.8) | 9 (14.8) | 61 (100) | |||