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Table 2 Returned newsletters, overall and by study address status

From: Predictors of locating women six to eight years after contact: internet resources at recruitment may help to improve response rates in longitudinal research

  Population density of the region   
Returned newsletter* Low (n = 750) High (n = 750) Full Sample (n = 1,500)
Overall (n = 1,500) 133 (17.7) 146 (19.5) 279 (18.6)
Study address status       
   No change (n = 1,030) 21 (4.2) 23 (4.3) 44 (4.3)
   New address (n = 106) 7 (8.0) 9 (47.4) 16 (15.1)
   Not identified (n = 364) 105 (64.8) 114 (56.4) 219 (60.2)
  1. Values expressed as number (percent).
  2. *Newsletter mailed in May 2003 returned due to incorrect or incomplete address.
  3. Address status as determined by March–May 2003 web-search [10-12].
  4. "Possible" address and "unable to determine" grouped since sent to last known address (results statistically similar: 59% of possible address and 61% of unable to determine were returned, chi-square = 0.24, df = 1, p = 0.62).
  5. Low population density = Oxford County, population density = 49/km2; high population
  6. density = East York within Toronto, population density = 5,418/km2 [9].