Table 3.
Descriptive statistics for mobile phone voice call use and CogHealth™ tasks [median (25th, 75th percentiles)]a
| Tests | Parameters | Baseline | Follow-up | ||
|---|---|---|---|---|---|
| MP voice calls (n) |
Median (25th, 75th percentiles) | MP voice calls (n) |
Median (25th, 75th percentiles) | ||
| Simple reaction time (Detection task) |
Response time (ms) | None (276) | 344 (302, 413) | None (243) | 317 (288, 359) |
| Some (59) | 350 (297, 410) | Some (57) | 315 (284, 342) | ||
| More (57) | 380 (321, 417) | More (83) | 316 (282, 362) | ||
| Accuracy (%) | None (278) | 97 (92, 100) | None (243) | 97 (95, 100) | |
| Some (61) | 97 (92, 100) | Some (57) | 97 (95, 100) | ||
| More (58) | 96 (83, 96) | More (83) | 97 (93, 100) | ||
| Choice reaction time (Identification task) |
Response time (ms) | None (277) | 588 (524, 686) | None (243) | 549 (481, 619) |
| Some (61) | 579 (518, 655) | Some (57) | 525 (484, 577) | ||
| More (58) | 607 (550, 699) | More (83) | 558 (493, 601) | ||
| Accuracy (%) | None (278) | 94 (86, 97) | None (243) | 94 (88, 97) | |
| Some (61) | 94 (88, 97) | Some (57) | 94 (88, 97) | ||
| More (58) | 94 (86, 97) | More (83) | 94 (89, 97) | ||
| One-back task (Working memory) |
Response time (ms) | None (278) | 965 (792, 1113) | None (243) | 863 (707, 1035) |
| Some (61) | 1023 (793, 1164) | Some (57) | 860 (741, 971) | ||
| More (57) | 976 (826, 1158) | More (83) | 930 (748, 998) | ||
| Accuracy (%) | None (278) | 88 (77, 94) | None (243) | 94 (86, 97) | |
| Some (61) | 94 (81, 97) | Some (57) | 92 (86, 97) | ||
| More (58) | 86 (69, 94) | More (83) | 94 (82, 97) | ||
| One card learning task (Visual recognition memory & attention) |
Response time (ms) | None (278) | 1072 (885, 1322) | None (243) | 1047 (854, 1273) |
| Some (61) | 1130 (881, 1387) | Some (57) | 1004 (875, 1170) | ||
| More (58) | 1143 (887, 1293) | More (83) | 1052 (936, 1225) | ||
| Accuracy (%) | None (278) | 59 (49, 66) | None (243) | 64 (54, 71) | |
| Some (61) | 57 (50, 64) | Some (57) | 63 (53, 68) | ||
| More (58) | 58 (49, 64) | More (83) | 64 (56, 70) | ||
| Go/NoGo (Response inhibition task) |
Response time (ms) | None (276) | 628 (539, 710) | None (243) | 592 (505, 676) |
| Some (60) | 600 (557, 707) | Some (57) | 549 (484, 628) | ||
| More (58) | 669 (599, 740) | More (83) | 574 (516, 655) | ||
| Accuracy (%) | None (277) | 98 (94, 100) | None (243) | 98 (96, 100) | |
| Some (61) | 98 (94, 98) | Some (57) | 98 (94, 98) | ||
| More (58) | 96 (91, 98) | More (83) | 98 (96, 100) | ||
| Groton maze learning task (Spatial & executive ability) |
Total number of errors | None (278) | 69 (54, 86) | None (243) | 55 (46, 67) |
| Some (61) | 65 (56, 76) | Some (57) | 56 (49, 69) | ||
| More (58) | 72 (55, 89) | More (83) | 59 (49, 72) | ||
a Statistics of children who took part in baseline and follow-up (n = 412)