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Table 1 Study population at baseline and follow ups, 1987-2008.

From: Nerve conduction in relation to vibration exposure - a non-positive cohort study

   1987 1987-1992a 1997 2002 2008
Total   151 241 220 195 197
  Exposedd 112(83) 181(108) 165(90) 141(57) 146(52)
  Unexposed 39 60 55 54 51
Returners from baseline (1987-1992)c Exposedd     8(1) 26(13)
  Unexposed     3 2
Lost to Follow up Exposede   9b(7) 16(12) 32(22) 21(4)
  Unexposed   3b 5 4 5
  1. a Baseline 1987-1992. Baseline consists of subjects entering the study in 1987 and 1992.
  2. b Lost to follow up between 1987 and 1992. The subjects are included in baseline (n = 241).
  3. c Subjects who were included at baseline, lost to follow up, but returned later to the study group in 2002 and/or 2008.
  4. d Subjects that currently are or previously have been exposed, the currently exposed in brackets.
  5. e Subjects that currently are or previously have been exposed, the currently exposed (based on the latest study) in brackets.