Table 3.
χ2 test for the relationship between duration of toothbrushing (per time) and systemic diseases/disorders in Japanese adolescents.
| Duration of Toothbrushing | |||||||
|---|---|---|---|---|---|---|---|
| min | |||||||
| Medical History | ≤1 | 2–3 | 4≤ | Total | p | ||
| All | n (%) | 1508 (16.6) | 4291 (47.3) | 3271 (36.1) | 9070 (100) | ||
| Pollinosis | Absence | n (%) | 1289 (16.8) | 3611 (47.2) | 2755 (36.0) | 7655 (100) | 0.448 |
| Presence | 219 (15.5) | 680 (48.1) | 516 (36.5) | 1415 (100) | |||
| Food/Drug allergy | Absence | n (%) | 1463 (16.6) | 4170 (47.4) | 3162 (36.0) | 8795 () | 0.433 |
| Presence | 45 (16.4) | 121 (44) | 109 (39.6) | 275 (100) | |||
| Inhaled antigen allergy (except pollinosis) | Absence | n (%) | 1477 (16.6) | 4219 (47.5) | 3193 (35.9) | 8889 (100) | 0.092 |
| Presence | 31 (17.1) | 72 (39.8) | 78 (43.1) | 181 (100) | |||
| Allergic rhinitis | Absence | n (%) | 1272 (16.5) | 3654 (47.4) | 2777 (36.1) | 7703 (100) | 0.753 |
| Presence | 236 (17.3) | 637 (46.6) | 494 (36.1) | 1367 (100) | |||
| Otitis media/externa | Absence | n (%) | 1475 (16.6) | 4219 (47.4) | 3198 (36.0) | 8892 (100) | 0.179 |
| Presence | 33 (18.5) | 72 (40.4) | 73 (41) | 178 (100) | |||
| Sinusitis | Absence | n (%) | 1486 (16.6) | 4225 (47.3) | 3214 (36.0) | 8925 (100) | 0.698 |
| Presence | 22 (15.2) | 66 (45.5) | 57 (39.3) | 145 (100) | |||
| Pneumothorax/Mediastinal emphysema | Absence | n (%) | 1492 (16.7) | 4238 (47.3) | 3229 (36.0) | 8959 (100) | 0.805 |
| Presence | 16 (14.4) | 53 (47.7) | 42 (37.8) | 111 (100) | |||
| Asthma/Cough variant asthma | Absence | n (%) | 1366 (16.7) | 3875 (47.3) | 2959 (36.1) | 8200 (100) | 0.943 |
| Presence | 142 (16.3) | 416 (47.8) | 312 (35.9) | 870 (100) | |||
| Atopic dermatitis | Absence | n (%) | 1378 (16.3) | 4000 (47.4) | 3053 (36.2) | 8431 (100) | 0.032 * |
| Presence | 130 (20.3) | 291 (45.5) | 218 (34.1) | 639 (100) | |||
| Urticaria | Absence | n (%) | 1483 (16.6) | 4231 (47.3) | 3226 (36.1) | 8940 (100) | 0.722 |
| Presence | 25 (19.2) | 60 (46.2) | 45 (34.6) | 130 (100) | |||
| Scoliosis | Absence | n (%) | 1501 (16.7) | 4265 (47.4) | 3238 (36.0) | 9004 (100) | 0.052 |
| Presence | 7 (10.6) | 26 (39.4) | 33 (50.0) | 66 (100) | |||
| Spondylosis/Spondylolisthesis/Hernia | Absence | n (%) | 1499 (16.6) | 4266 (47.3) | 3251 (36.1) | 9016 (100) | 0.987 |
| Presence | 9 (16.7) | 25 (46.3) | 20 (37) | 54 (100) | |||
| Strabismus | Absence | n (%) | 1501 (16.7) | 4258 (47.3) | 3243 (36.0) | 9002 (100) | 0.338 |
| Presence | 7 (10.3) | 33 (48.5) | 28 (41.2) | 68 (100) | |||
| Myopia/Hyperopia/Astigmatism | Absence | n (%) | 1493 (16.6) | 4247 (47.3) | 3246 (36.1) | 8986 () | 0.479 |
| Presence | 15 (17.9) | 44 (52.4) | 25 (29.8) | 84 (100) | |||
| Arrhythmia | Absence | n (%) | 1482 (16.5) | 4254 (47.5) | 3227 (36.0) | 8963 (100) | 0.016 * |
| Presence | 26 (24.3) | 37 (34.6) | 44 (41.1) | 107 (100) | |||
| Abnormal ECG other than arrhythmia | Absence | n (%) | 1499 (16.7) | 4259 (47.3) | 3243 (36.0) | 9001 (100) | 0.624 |
| Presence | 9 (13.0) | 32 (46.4) | 28 (40.6) | 69 (100) | |||
| Anemia | Absence | n (%) | 1497 (16.6) | 4268 (47.4) | 3244 (36.0) | 9009 (100) | 0.299 |
| Presence | 11 (18.0) | 23 (37.7) | 27 (44.3) | 61 (100) | |||
*: <0.05.