Table 2 Univariate analysis of the factors associated with smartphone addiction in adolescents [n (%)]
|  | Total (N = 2639) | Smartphone addiction Positive (n = 602) | Smartphone addiction Negative (n = 2037) | P value |
|---|---|---|---|---|
Grade |  |  |  | < 0.001 |
 7 | 1005 (38.1) | 166 (16.5) | 839 (83.5) |  |
 8 | 727 (27.5) | 178 (24.5) | 549 (75.5) |  |
 9 | 907 (34.4) | 258 (28.4) | 649 (71.6) |  |
Gender | Â | Â | Â | 0.586 |
 female | 1218 (46.2) | 272 (22.3) | 946 (77.7) |  |
 male | 1421 (53.8) | 330 (23.2) | 1091 (76.8) |  |
BMI Percentile |  |  |  | < 0.001 |
  < 85% (Normal) | 1953 (74.0) | 342 (17.5) | 1611 (82.5) |  |
 85 to 95% (Overweight) | 472 (17.9) | 163 (34.5) | 309 (65.5) |  |
  > 95% (Obesity) | 214 (8.1) | 97 (45.3) | 117 (54.7) |  |
Sleep quality |  |  |  | < 0.001 |
 Good | 2121 (80.4) | 94 (4.4) | 2027 (95.6) |  |
 Pool | 518 (19.6) | 508 (98.1) | 10 (1.9) |  |
Hypertension |  |  |  | < 0.001 |
 No | 2211 (83.8) | 338 (15.3) | 1873 (84.7) |  |
 Yes | 428 (16.2) | 264 (61.7) | 164 (38.3) |  |