Table 3 Univariate analysis of the factors associated with adolescent hypertension [n (%)]
|  | Total (N = 2639) | Hypertension group (n = 428) | Non-hypertension group (n = 2211) | P value |
|---|---|---|---|---|
Grade | Â | Â | Â | 0.006 |
 7 | 1005 (38.1) | 134 (13.3) | 871 (86.7) |  |
 8 | 727 (27.5) | 128 (17.6) | 599 (82.4) |  |
 9 | 907 (34.4) | 166 (18.3) | 741 (81.7) |  |
Gender |  |  |  | < 0.001 |
 Female | 1218 (46.2) | 160 (13.1) | 1058 (86.9) |  |
 Male | 1421 (53.8) | 268 (18.9) | 1153 (81.1) |  |
BMI Percentile |  |  |  | < 0.001 |
  < 85% (Normal) | 1953 (74.0) | 222 (11.4) | 1731 (88.6) |  |
 85 to 95% (Overweight) | 472 (17.9) | 109 (23.1) | 363 (76.9) |  |
  > 95% (Obesity) | 214 (8.1) | 97 (45.3) | 117 (54.7) |  |
Sleep quality |  |  |  | < 0.001 |
 Good | 2121 (80.4) | 176 (8.3) | 1945 (91.7) |  |
 Pool | 518 (19.6) | 252 (48.6) | 266 (51.4) |  |
Smartphone addiction |  |  |  | < 0.001 |
 Negative | 2037 (77.2) | 164 (8.1) | 1873 (91.9) |  |
 Positive | 602 (22.8) | 264 (43.9) | 338 (56.1) |  |