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Table 1 Screening phases of the Caerphilly study: Phases 1 to 4

From: Road traffic noise, noise sensitivity, noise annoyance, psychological and physical health and mortality

Screening Phase

Years

N

Comment

Phase 1

1979–83

2512/2818

Response rate 89%

Phase 2

1984–88

2398

477 added, 561 lost

Phase 3

1989–93

2154

 

Phase 4

1993–97

1701

344 died, 353 moved

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Environmental Health

ISSN: 1476-069X