Table 4.

Number of workers with reduced vibration sensation in the finger.

	1991 workers and age-matched controls (n = 23 pairs)				1999 workers and age-matched controls (n = 12 pairs)
	Right finger*		Left finger*		Right finger		Left finger
Delay timea (sec)	1-BP workers	Controls	1-BP workers	Controls	1-BP workers	Controls	1-BP workers	Controls
< 2	19	23	19	23	10	12	10	12
2	3	0	2	0	2	0	2	0
3	1	0	2	0	1	0	0	0

^aDelay time for vibration sensation by tuning fork stimulation (see “Materials and Methods” for details); time 0 is the time when the worker reported becoming unaware of the vibration.

^*p < 0.05, Wilcoxon test.