Table 1

Baseline observations

 Multiple and patrol number
1234Total
123123123123
PIHP one ear0
PIHP both ears12133414
E-A-R one ear0
E-A-R both ears2111117
CAEP one ear1113
CAEP both ears21144311144430
No PHP999981077733384
Total111110131213111211111112138
Cumulative 
 PHP in at least one ear5/32 (16%)11/38 (29%)13/34 (38%)25/34 (74%)54/138 (39%)
 No PHP27/32 (84%)27/38 (71%)21/34 (62%)9/34 (26%)84/138 (61%)
  • PHP, personal hearing protection; PIHP, Personal Interfaced Hearing Protection.