Table 5.
Descriptive statistics [median (25th, 75th percentiles)] for the Stroop Color-Word test time ratios vs phone use type [CP (cordless phone) or MP (mobile phone)]a
| Forms | Parameters | Exposure type | Baseline | Exposure type | Follow-up |
|---|---|---|---|---|---|
| Groups (n) | Median (25th, 75th percentiles) | Groups (n) | Median (25th, 75th percentiles) | ||
| Stroop ratio ((B-A)/A) |
Time ratio | MP voice calls | MP voice calls | ||
| None (276) | 0.09 (0.02, 0.16) | None (218) | 0.11 (0.03, 0.22) | ||
| Some (60) | 0.10 (0.02, 0.18) | Some (84) | 0.13 (0.06, 0.22) | ||
| More (60) | 0.08 (0.003, 0.15) | More (78) | 0.10 (0.05, 0.20) | ||
| CP voice calls | CP voice calls | ||||
| None (66) | 0.07 (0.01, 0.14) | None (76) | 0.11 (0.04, 0.20) | ||
| Some (184) | 0.89 (0.007, 0.17) | Some (177) | 0.12 (0.04, 0.24) | ||
| More (138) | 0.11 (0.04, 0.17) | More (127) | 0.10 (0.04, 0.20) | ||
| Stroop ratio ((D-C)/C) |
Time ratio | MP voice calls | MP voice calls | ||
| None (276) | 0.69 (0.53, 0.91) | None (218) | 0.66 (0.52, 0.84) | ||
| Some (60) | 0.65 (0.52, 0.81) | Some (84) | 0.60 (0.45, 0.81) | ||
| More (60) | 0.68 (0.59, 0.87) | More (78) | 0.66 (0.50, 0.83) | ||
| CP voice calls | CP voice calls | ||||
| None (66) | 0.60 (0.52, 0.77) | None (76) | 0.56 (0.46, 0.71) | ||
| Some (184) | 0.70 (0.53, 0.93) | Some (177) | 0.67 (0.53, 0.86) | ||
| More (138) | 0.68 (0.57, 0.89) | More (127) | 0.66 (0.52, 0.85) | ||
a Statistics of children who took part in baseline and follow-up (n = 412)