Anicteric hepatoxicity: a potential health risk of occupational exposures in Nigerian petroleum oil refining and distribution industry

Table 4 Mean values of liver function parameters studied for the various age groups of the oil workers & control subjects

Age group	Parameter	Non-oilworkers Mean ± SD	Oil workers Mean ± SD	P-value
30-39 (Non-oil workers, n = 5), (Oil workers, n = 97)	Age	36.60 ± 1.52	35.55 ± 2.69	0.651
	Service period	10.00 ± 4.18	11.46 ± 4.34*	0.000
	Total bilirubin	0.52 ± 0.04	0.66 ± 0.18*	0.035
	ALK. PHOS	62.60 ± 19.83	133.41 ± 40.17*	0.000
	AST	23.00 ± 2.09	22.59 ± 9.17	0.066
	ALT	16.78 ± 6.30	24.02 ± 12.99	0.462
40-49 (Non-oil workers, n = 13), (Oil workers, n = 142)	Age	45.46 ± 2.60	44.27 ± 2.71
	Service period	19.62 ± 7.30	16.82 ± 5.34*	0.005
	Total bikirubin	0.56 ± 0.09	0.66 ± 0.20*	0.041
	ALK. PHOS	66.23 ± 12.40	121.62 ± 39.18*	0.000
	AST	27.35 ± 8.85	20.38 ± 8.79*	0.004
	ALT	24.35 ± 13.80	21.30 ± 10.68	0.657
50-59 (Non-oil workers, n = 13), (Oil workers, n = 64)	AGE	53.92 ± 2.78	53.23 ± 2.61
	Service period	24.67 ± 8.29	21.97 ± 5.64	0.106
	Total bilirubin	0.62 ± 0.17	0.66 ± 0.23*	0.052
	ALK. PHOS	69.25 ± 24.09	125.68 ± 39.08*	0.000
	AST	28.02 ± 5.77	23.76 ± 18.03	0.236
	ALT	22.37 ± 5.87	21.43 ± 9.68	0.768

Multiple Comparisons using Least Significant Difference (LSD) was the statistical method of analysis applied. * indicates statistically significant difference.

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