Table 2

Agreement between reported and observed sources of exposure to vibration over a 1 hour period

Source of exposure	Workers reporting exposures (n)	Workers observed to be exposed (n)	Sensitivity (%)	Specificity (%)
Floor polisher	13	13	100	100
Nut runner	15	15	66	97
Impact wrench	13	7	71	95
Impact screwdriver	12	18	39	97
Jig saw	12	13	69	98
Circular saw	9	6	100	98
Hand guided mower	10	10	100	100
Hammer drill	16	30	53	100
Riveting hammer or dolly	13	1	100	93
Nailing or stapling gun	17	24	58	98
Hand held portable grinder	12	14	86	100
Hand held sander	13	10	90	98
Any source of hand transmitted vibration^2-150	110	113	96	98
Van	12	7	100	97
Bus or coach	13	12	100	97
Tractor	9	9	89	99
Fork lift truck	24	25	96	100
Lorry	10	7	100	98
Any source of whole body vibration^2-150	73	65	97	91