But the group that had been exposed to passive smoking at home appeared to bear the entire risk increase, while those who were not exposed to passive smoking did not show any increased risk with increasing radon level.
Den grupp av fallen som varit utsatta för miljötobaksrök i hemmet syntes svara för hela riskökningen, medan de som inte varit utsatta för miljötobaksrök inte uppvisade någon riskökning med ökande radonkoncentration.