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Table 1 Respondents and response rates (%) by age group, sex and mobile phone use, and by stage.

From: Validation of exposure assessment and assessment of recruitment methods for a prospective cohort study of mobile phone users (COSMOS) in Finland: a pilot study

  1ststage 2ndstage All
Age group (years) N (%) N (%) N (%)
   18-29 80 (13) 40 (8) 120 (11)
   30-39 75 (13) 59 (12) 134 (12)
   40-49 58 (10) 40 (8) 98 (9)
   50-59 76 (13) 37 (8) 113 (10)
   60-69 104 (17) 62 (13) 166 (15)
Sex    
   Male 179 (12) 102 (9) 281 (11)
   Female 214 (14) 136 (11) 350 (13)
Call time (minutes per month)    
   0-29 99 (10) 62 (8) 161 (9)
   30-359 138 (14) 76 (10) 214 (12)
   360- 156 (16) 100 (13) 256 (14)