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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.
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BMC Medical Research Methodology

ISSN: 1471-2288

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