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

Table 6 Cordless phone use cognitive test results for accuracy

Test	Skill	Parameter	Call group	Regression coefficient^a	95 % CI for coefficient	p
Detection^b	Simple reaction time and psychomotor speed	Accuracy	‘None’	0
			‘Some’	0.084	(-0.004, 0.172)	0.06
			‘More’	0.012	(-0.057, 0.082)	0.72
Identification^b	Choice reaction and visual attention	Accuracy	‘None’	0
			‘Some’	0,032	(-0.020, 0.084)	0.22
			‘More’	-0.024	(-0.075, 0.028)	0.36
One-back task^c	Working memory	Accuracy	‘None’	0
			‘Some’	0.023	(-0.049, 0.096)	0.52
			‘More’	-0.022	(-0.095, 0.052)	0.55
One-card learning^c	Visual recognition and episodic memory	Accuracy	‘None’	0
			‘Some’	0.009	(-0.024, 0.041)	0.58
			‘More’	-0.022	(-0.058, 0.014)	0.23
Groton Maze Learning^d	Spatial and executive ability	Accuracy	‘None’	0
			‘Some’	0.004	(-0.071, 0.079)	0.92
			‘More’	0.054	(-0.031, 0.139)	0.21
Go/NoGo^c	Response inhibition	Accuracy	‘None’	0
			‘Some’	0.022	(-0.046, 0.090)	0.52
			‘More’	-0.017	(-0.086, 0.052)	0.62

^aThese are the 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 accuracy in the “Detection” task, the ‘Some’ coefficient is 0.084 and the ‘More’ coefficient 0.012. This indicates the adjusted mean is higher in both the ‘Some’ group and the ‘More’ group when compared to the ‘None’ group
^bBase 10 log transformed data originally in milliseconds (response time tests)
^cSquare root arcsine transformed data (accuracy tests)
^dBase e log transformed (total number of errors)
^eTime ratio (B-A)/A
^fTime ratio (D-C)/C

ISSN: 1476-069X