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Table 3 Characteristics of sample and proportion requiring tracing, n = 1,500

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

  Total sample % Required tracing*
  n (%) (%)
Age group (years)    
   65–69 313 (20.9) (21.4)
   70–79 721 (48.1) (21.9)
   80–89 466 (31.1) (31.5)
Region (population density)    
   Low 750 (50.0) (22.1)
   High 750 (50.0) (27.5)
Web-search in 2001    
   Yes 507 (33.8) (24.5)
   No 993 (66.2) (25.0)
Study address status    
   No change 1030 (68.7) (6.6)
   New address 106 (7.1) (16.0)
   Possible address 135 (9.0) (80.0)
   Unable to determine§ 229 (15.3) (78.2)
  1. *Proportion within each sub-category that required tracing.
  2. Low population density = Oxford County, population density = 49/km2; high population
  3. density = East York within Toronto, population density = 5,418/km2 [9].
  4. Address status as determined by March–May 2003 web-search [10-12]; completed blind of 2001 web-search results.
  5. §Not found or too many possible.