Table 4.
Prior Experience with Cell Phones
| TM (n=47) | Control (n=48) | Difference (95% CI) | |
|---|---|---|---|
| Who pays for cell phone | |||
| I pay for all of the costs | 14 (29%) | 14 (29%) | 0 (−17 to 19) |
| My parents pay some or all of the costs | 26 (56%) | 27 (56%) | 0 (−18 to 20) |
| Other | 6 (12%) | 5 (10%) | 2 (−11 to 16) |
| What kind of cell phone plan do you have? | |||
| A pre-paid or pay-as-you-go plan | 4 (8%) | 5 (10%) | 2 (−11 to 15) |
| A family plan (part of a contract that covers your family’s cell phones) | 20 (43%) | 21 (44%) | 1 (−18 to 20) |
| A separate contract covering only your cell phone | 17 (36%) | 18 (37%) | 1 (−18 to 20) |
| I don’t know what kind of plan it is | 6 (12%) | 4 (8%) | 4 (−9 to 18) |
| How old were you when you got your first cell phone? | |||
| Under 10 years | 6 (13%) | 2 (4%) | 9 (−3 to 21) |
| 10 | 5 (11%) | 9 (19%) | 8 (−7 to 23) |
| 11 | 10 (21%) | 8 (16%) | 5 (−11 to 20) |
| 12 | 9 (19%) | 10 (21%) | 2 (−15 to 18) |
| 13 | 8 (17%) | 8 (17%) | 0 (−15 to 16) |
| 14 | 2 (4%) | 7 (14%) | 10 (−2 to 23) |
| 15 | 3 (6%) | 1 (2%) | 4 (−5 to 15) |
| 16 | 3 (6%) | 1 (2%) | 4 (−5 to 15) |
| How often do you send/receive text messages? | |||
| Every day | 47 (100%) | 48 (100%) | 0 (−8 to 7) |
| On an average day, how many text messages would you say that you send or receive | |||
| 1–10 text messages | 4 (8%) | 1 (2%) | 6 (−4 to 18) |
| 11–20 text messages | 4 (8%) | 4 (8%) | 0 (−12 to 13) |
| 21–50 text messages | 6 (13%) | 8 (17%) | 4 (−11 to 18) |
| 51–100 text messages | 8 (17%) | 5 (10%) | 7 (−8 to 21) |
| More than 100 text messages | 22 (47%) | 26 (54%) | 7 (−12 to 26) |
| I don’t know | 3 (6%) | 4 (8%) | 2 (−10 to 13) |