Table 4.

Comparison between hippuric acid levels and reported acute neurologic symptoms

Parameter	Number of exposed workers	Median of hippuric acid (mg/g creatinine)	Interquartile range	Range	p
Headache
No	48	545	478	90–1280	< 0.001*
Yes	39	1145	824	220–2547
Dizziness
No	45	460	550	90–1875	< 0.001*
Yes	42	945	850	220–2547
Nausea
No	38	450	532	90–2420	< 0.001*
Yes	49	860	640	420–2547
Anorexia
No	55	790	520	90–1280	0.117
Yes	32	800	900	220–2547
Insomnia
No	39	790	530	90–1895	0.063
Yes	48	840	1000	160–2547
Loss of coordination
No	83	800	688	90–1895	0.974
Yes	4	840	860	160–2547
Muscle spasm
No	50	545	472	90–1895	< 0.001*
Yes	37	1145	812	220–2547

Hippuric acid levels in urine (mg/g creatinine) Airborne toluene levels (ppm).