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Table 1 Cognitive outcomes by level of phone use: descriptive statistics for CogState Research™ tasks (untransformed)

From: Use of mobile and cordless phones and cognition in Australian primary school children: a prospective cohort study

   Mobile phone use/ownership exposure group Median (IQRa) Cordless phone use exposure group Median (IQRa)
Cognitive Test (purpose) Measure ‘None’e n = 415 ‘Some’f n = 88 ‘More’g n = 86 ‘None’h n = 114 ‘Some’i n = 256 ‘More’j n = 207
Detection (simple reaction time). Responseb 347 (306, 420) 351 (297, 411) 367 (321, 412) 344 (309, 414) 346 (304, 403) 359 (307, 420)
Accuracyc 97 (90,100) 97 (90,100) 96 (90,97) 95 (85, 100) 97 (93, 100) 95 (90, 97)
Identification (choice reaction) Responseb 596 (524,689) 576 (514,662) 609 (552,705) 580 (526, 670) 593 (521, 671) 602 (534, 694)
Accuracyc 91 (86, 97) 91 (88, 97) 94 (86, 97) 91 (83, 97) 91 (86, 97) 94 (86, 97)
One-back (working memory) Responseb 980 (810, 1125) 979 (763, 1161) 970 (826, 1120) 964 (774, 1114) 948 (795, 1113) 987 (818, 1137)
Accuracyc 88 (72, 94) 89 (76, 95) 84 (69, 94) 86 (67, 94) 86 (77, 94) 86 (72, 94)
One card learning (episodic memory) Responseb 1071 (880, 1312) 1116 (824, 1358) 1135 (941, 1303) 1040 (876, 1305) 1052 (884, 1290) 1119 (853, 1320)
Accuracyc 58 (48, 65) 57 (49, 65) 58 (47, 65) 56 (48, 64) 59 (51, 66) 58 (46, 65)
Go-NoGo (response inhibition) Responseb 641 (552, 736) 603 (552, 701) 670 (598, 754) 642 (565, 742) 636 (544, 726) 639 (569, 724)
Accuracyc 97 (93, 100) 98 (93, 99) 96 (91, 98) 98 (91, 98) 98 (93, 100) 96 (93, 100)
Groton Maze (spatial & executive ability) Accuracyd 70 (54, 88) 69 (58, 78) 73 (56, 93) 71 (58, 88) 69 (54, 84) 70 (56, 88)
  1. aInter Quartile Range; bResponse time in milliseconds for true positive and true negatives; cAccurate hit rate (%); dTotal errors; e‘None’ = no MP use; f‘Some’ ≤2.5 MP calls per week; g‘More’ >2.5 MP calls per week; h‘None’ = no CP use; i‘Some’ ≤2 CP calls per week; j‘More’ >2 CP calls per week