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Table 5 Cordless phone use cognitive test results for response time

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

Test

Skill

Parameter

Call group

Regression coefficienta

95 % CI for coefficient

p

Detectionb

Simple reaction time and psychomotor speed

Response time

‘None’

0

  

‘Some’

-0.010

(-0.043, 0.023)

0.56

‘More’

0.007

(-0.026, 0.041)

0.66

Identificationb

Choice reaction and visual attention

Response time

‘None’

0

  

‘Some’

0.003

(-0.014, 0.020)

0.74

‘More’

0.006

(-0.018, 0.030)

0.60

One-back taskb

Working memory

Response time

‘None’

0

  

‘Some’

-0.001

(-0.027, 0.025)

0.95

‘More’

0.006

(-0.025, 0.037)

0.68

Go/NoGob

Response inhibition

Response time

‘None’

0

  

‘Some’

-0.001

(-0.022, 0.020)

0.92

‘More’

0.007

(-0.019, 0.033)

0.61

One-card learningb

Visual recognition and episodic memory

Response time

‘None’

0

  

‘Some’

-0.005

(-0.041, 0.031)

0.79

‘More’

-0.011

(-0.052, 0.030)

0.59

Stroop Ac

 

Response time ratio

‘None’

0

  

‘Some’

-0.006

(-0.041, 0.029)

0.74

‘More’

0.029

(-0.007, 0.065)

0.11

Stroop Cd

 

Response time ratio

‘None’

0

  

‘Some’

0.041

(-0.038, 0.119)

0.30

‘More’

0.037

(-0.023, 0.097)

0.22

  1. aThese are regression coefficients adjusted for age, gender, language other than English, handedness, and socioeconomic status. The coefficient represents the difference in adjusted means of the outcome between each of the exposure groups ‘Some’ and ‘More’ and the non-exposed reference group ‘None’. For example, for the simple reaction time for the “Detection” task, the ‘Some’ coefficient is -0.010. This indicates the adjusted mean is lower in the ‘Some’ group than the ‘None’ group
  2. bBase 10 log transformed data originally in milliseconds (response time tests)
  3. cTime ratio (B-A)/A
  4. dTime ratio (D-C)/C