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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