Similar results were found for regular use of DECT, but use of these phone types was significantly intercorrelated (p < 0.001).
Cumulative use of the phone types was analysed in quartiles based on use of wireless phones in total among the controls (first quartile >39-405 h, second quartile 406 1,091 h, third quartile 1,092-2,376 h, fourth quartile >2,376 h).
To think this new OS will supplant those phone types is folly.
Secondly, the extent of cordless phone use is positively related to that of cellphone use for calls, both in this study and elsewhere [ 6, 22], so heavy use of one phone type is compounded by heavy use of the other.
The first phone of this type was offered in 2006 and sold around 500,000 units.
In the streets near Tehran's Hasheminejad hospital, home to a major kidney transplant centre, a patchwork of phone numbers and blood types is sprayed on the walls of public or private properties.
These results did not change if years of use of any mobile or cordless phone prior to the respective type was included as a covariate in each analysis of the individual phone types (data not in table).
Note that for the various phone types the cumulative time was counted for use of the specific phone, but for the category "mobile phones" all types of mobile phones were included, and for "wireless phones" also use of cordless phones was included.
School type was associated with mobile phone and trust to authority dimensions.
For all phone types the highest risk was found in the fourth quartile > 2,376 hours of cumulative use.
