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Table 2 Cognitive outcomes by level of phone use: descriptive statistics for STROOP colour word test

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)
Form Parameter ‘None’e n = 412 ‘Some’f n = 87 ‘More’g n = 88 ‘None’h n = 112 ‘Some’i n = 255 ‘More’j n = 208
A Time (s) 26 (24, 30) 27 (24, 30) 26 (23, 30) 27 (24, 30) 26 (24, 30) 26 (24, 29)
B Time (s) 28 (26,33) 30 (27,34) 28 (25, 32) 30 (25, 34) 28 (25. 32) 29 (26, 33)
C Time (s) 38 (33, 43) 38 (35, 43) 37 (32, 41) 39 (34, 44) 37 (32, 43) 37 (32,42)
D Time (s) 65 (55, 77) 65 (57, 74) 65 (56, 75) 65 (58, 78) 65 (55, 75) 64 (56, 74)
(B-A)/Ab Time ratio 0.10 (0.02, 0.17) 0.10 (0.03, 0.19) 0.08 (0.01, 0.17) 0.09 (0.01, 0.16) 0.09 (0.01, 0.17) 0.11 (0.04, 0.20)
(D-C)/Cb Time ratio 0.71 (0.54, 0.92) 0.67 (0.54, 0.98) 0.74 (0.60, 0 95) 0.66 (0.52, 0.96) 0.71 (0.53, 0.95) 0.73 (0.58, 0.92)
  1. aInter Quartile Range
  2. bA positive value is how much longer it takes to respond to the incongruous condition compared to the word in black ink or the colour of a meaningless symbol, expressed as a proportion of the time taken to respond to the latter; 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