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Table 4 Descriptive statistics for cordless phone voice call use and CogHealth™ tasks [median (25th, 75th percentiles)]a

From: Use of mobile and cordless phones and change in cognitive function: a prospective cohort analysis of Australian primary school children

Tests

Parameters

Baseline

Follow-up

CP voice calls

(n)

Median (25th, 75th percentiles)

CP voice calls

(n)

Median (25th, 75th percentiles)

Simple reaction time

(Detection task)

Response time (ms)

None (66)

336 (306, 394)

None (76)

326 (294, 373)

Some (183)

347 (299, 404)

Some (177)

325 (288, 357)

More (135)

350 (307, 414)

More (123)

309 (279, 352)

Accuracy (%)

None (67)

95 (89, 100)

None (76)

97 (95, 100)

Some (185)

97 (94, 100)

Some (177)

97 (95, 100)

More (137)

95 (87, 100

More (123)

97 (93, 100

Choice reaction time

(Identification task)

Response time (ms)

None (67)

573 (526, 662)

None (76)

545 (496, 595)

Some (185)

589 (521, 665)

Some (177)

559 (489, 611)

More (137)

596 (536, 685)

More (123)

529 (476, 592)

Accuracy (%)

None (67)

91 (85, 97)

None (76)

94 (91, 97)

Some (185)

94 (86, 97)

Some (177)

94 (88, 97)

More (137)

94 (86, 97)

More (123)

94 (88, 97)

One-back task

(Working memory)

Response time (ms)

None (67)

958 (751, 1062)

None (76)

883 (729, 985)

Some (185)

939 (793, 1114)

Some (177)

865 (715, 1022)

More (137)

992 (818, 1132)

More (123)

865 (712, 1020)

Accuracy (%)

None (67)

89 (74, 94)

None (76)

93 (86, 97)

Some (185)

89 (77, 94)

Some (177)

94 (86, 97)

More (137)

89 (74, 94)

More (123)

91 (84, 97)

One card learning task

(Visual recognition memory & attention)

Response time (ms)

None (67)

1015 (827, 1274)

None (76)

1065 (940, 1345)

Some (185)

1071 (887, 1312)

Some (177)

1042 (875, 1218)

More (137)

1150 (874, 1340)

More (123)

1013 (862, 1224)

Accuracy (%)

None (67)

56 (49, 65)

None (76)

64 (56, 70)

Some (185)

60 (51, 66)

Some (177)

65 (56, 72)

More (137)

59 (50, 65)

More (123)

61 (53, 69)

Go/NoGo

(Response inhibition task)

Response time (ms)

None (66)

616 (558, 694)

None (76)

569 (517, 656)

Some (185)

633 (541, 720)

Some (177)

580 (503, 662)

More (136)

631 (565, 706)

More (123)

583 (503, 689)

Accuracy (%)

None (67)

98 (94, 98)

None (76)

98 (96, 100)

Some (185)

98 (94, 100)

Some (177)

98 (96, 100)

More (136)

96 (94, 100)

More (123)

98 (94, 100)

Groton maze learning task

(Spatial & executive ability)

Total number of errors

None (67)

65 (55, 84)

None (76)

56 (46, 67)

Some (185)

69 (54, 80)

Some (177)

56 (46, 68)

More (137)

68 (55, 84)

More (123)

58 (48, 70)

  1. a Statistics of children who took part in baseline and follow-up (n = 412)