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Table 2 MP and CP exposure measures [baseline & follow-up participants (n = 412)]

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

Total number of MP and CP calls/SMS weeklya

Baseline

Follow-up

 
 

Median (25th, 75th percentiles)

b p-value

 MP voice calls (dialed & received)

2 (1,5)

2.5 (1,5.2)

<0.001

 MP SMS (sent & received)

0.5 (0,4)

2 (0,7.5)

<0.001

 CP voice calls (dialed & received)

2 (1,4)

2 (1,4)

0.26

MP and CP usagec

Proportion (number) of children

MP voice calls

 No use

69.7% (n = 279)

57.6% (n = 220)

<0.001 d

 Some use (≤2 calls weekly)

15.3% (n = 61)

22.0% (n = 84)

 More use (>2 calls weekly)

15.0% (n = 60)

20.4% (n = 78)

CP voice calls

 No use

17% (n = 67)

20% (n = 76)

0.04 d

 Some use (≤2 calls weekly)

47.5% (n = 186)

46% (n = 177)

 More use (>2 calls weekly)

35.5% (n = 139)

34% (n = 129)

  1. aData included MP & CP users only, bWilcoxon signed-rank test, cData included both non-users and users, d Fleiss-Everitt Chi square test based on non-missing data, The bold numbers represent statistically significant assoctions