Table 2.
Social media use and behaviors at baseline (T1) and 16-month follow-up (T2).
| Variables of interest |
|
T1, n/N (%) | T2, n/N (%) | P value |
| Cell phone access (yes) |
|
488/555 (87.9) | 494/555 (89.0) | .04 |
| Missing data on cell phone access |
|
5/555 (0.9) | 18/555 (3.2) | — |
| Cell phone activities |
|
|
|
|
|
|
334/466 (71.7) | 427/485 (88.0) | <.001 | |
|
|
Pictures | 451/476 (94.8) | 477/489 (97.6) | .01 |
|
|
Listen to music | 445/482 (92.3) | 475/492 (96.5) | .001 |
|
|
Instant messages | 438/474 (92.4) | 469/489 (95.9) | .01 |
|
|
Record videos | 381/467 (81.6) | 427/478 (89.3) | <.001 |
|
|
Play games | 394/470 (83.8) | 412/478 (86.2) | — |
|
|
Access Internet | 430/479 (89.8) | 474/488 (97.1) | <.001 |
| Mean number of activities on cell phone (SD) |
|
5.9 (1.61) | 6.3 (1.26) | <.001 |
| SMS use |
|
467/488 (95.7) | 486/493 (98.6) | .01 |
| More than 100 SMS/day |
|
149/438 (34.0) | 135/484 (27.9) | .02 |
| 100 or fewer SMS/day |
|
289/438 (66.0) | 349/484 (72.1) | — |
| SMS parents at least once/day |
|
239/448 (53.4) | 260/481 (54.1) | — |
| SMS friends at least once/day |
|
403/460 (87.6) | 418/486 (86.0) | — |
| SMS boy/girlfriend at least once/day |
|
283/437 (64.8) | 322/469 (68.7) | — |
| Internet use |
|
533/550 (96.9) | 529/537 (98.5) | — |
| Internet activities |
|
|
||
|
|
Send/read email | 420/516 (81.4) | 464/523 (88.7) | <.001 |
|
|
Research health information | 184/504 (36.5) | 307/518 (59.3) | <.001 |
|
|
Information for homework or school | 454/517 (87.8) | 486/521 (93.3) | .001 |
| Use Internet once/day |
|
415/531 (78.2) | 416/529 (78.6) | — |
| Has social networking account |
|
528/552 (95.7) | 518/534 (97.0) | — |
|
|
458/552 (83.0) | 390/534 (73.0) | <.001 | |
|
|
324/552 (58.7) | 298/534 (55.8) | — | |
|
|
YouTube | 341/552 (61.8) | 357/534 (66.9) | .03 |
|
|
82/555 (14.8) | 130/555 (23.4) | <.001 | |
| Social networking activities |
|
|
|
|
|
|
Send instant messages | 421/512 (82.2) | 412/507 (81.3) | — |
|
|
Post comments | 440/522 (84.4) | 425/520 (81.7) | — |
|
|
Send private messages | 357/519 (68.8) | 353/509 (69.4) | — |
|
|
Tag people | 387/512 (75.6) | 385/510 (75.5) | — |
|
|
Post status updates | 391/508 (77.0) | 354/505 (70.1) | .003 |
|
|
Post photos or videos | 466/517 (90.1) | 454/512 (88.7) | — |
| Logging in to social networking sites ≥1 time/day |
|
417/527 (79.1) | 426/519 (82.1) | — |