Table 2

Benzene concentration in personal and outdoor air samples, and urine level of cotinine and benzene metabolites by season and overall

	Obs (#)	Mean	SD	G-mean	G-SD	Min	Percentiles			Max
	Obs (#)	Mean	SD	G-mean	G-SD	Min	p25	p50	p75	Max
Benzene in personal air samples (µg/m³)
Spring	57	2.51	1.89	2.10	1.75	0.60	1.50	1.82	3.11	11.12
Summer	86	2.26	1.45	1.90	1.82	0.47	1.25	1.85	3.10	8.13
Autumn	62	4.31	2.60	3.73	1.57	0.92	2.939	3.70	5.17	18.47
Winter	56	4.04	1.78	3.67	1.73	1.55	2.34	4.00	5.24	9.03
Individual yearly averages	99	3.00	1.45	2.66	1.67	0.75	2.05	2.90	3.83	9.00
Benzene in outdoor air samples (µg/m³)
Spring	57	2.29	1.30	1.93	1.84	0.48	1.20	1.91	3.15	5.67
Summer	86	1.94	1.20	1.65	1.75	0.39	1.12	1.58	2.28	6.92
Autumn	62	3.99	2.58	3.05	1.92	0.08	1.93	3.42	5.63	11.18
Winter	56	3.80	1.86	3.25	2.35	0.15	2.40	3.66	5.20	8.31
Individual yearly averages	99	2.70	1.41	2.33	1.78	0.27	1.59	2.37	3.63	6.92
Cotinine (µg/g creatinine)
Spring	78	3.92	7.04	1.91	3.26	0.05	1.00	1.94	3.50	49.0
Summer	78	3.20	5.52	1.50	3.59	0.09	0.82	1.68	3.71	41.4
Autumn	76	4.54	8.51	1.92	3.92	0.05	1.20	1.93	4.30	48.7
Winter	74	4.36	7.38	2.32	3.01	0.10	1.20	2.30	4.80	53.5
Individual yearly averages	98	3.73	5.99	2.14	2.67	0.30	1.08	2.09	3.58	41.9
MA (µg/g creatinine)
Spring	81	104.22	69.28	87.43	1.79	17.00	60.27	82.00	126.99	349.00
Summer	79	140.40	226.73	92.30	2.16	13.33	56.54	83.00	131.76	1680.00
Autumn	76	128.24	124.04	99.57	1.94	30.21	60.16	102.48	147.21	893.04
Winter	74	119.09	100.15	95.30	1.86	26.00	65.00	86.00	129.00	591.00
Individual yearly averages	98	116.65	84.89	101.06	1.62	46.42	73.33	92.66	122.50	593.42
S-PMA (µg/g creatinine)
Spring	81	1.13	0.60	1.00	1.62	0.21	0.80	1.00	1.30	3.70
Summer	79	1.12	0.54	1.02	1.54	0.41	0.72	1.00	1.39	3.30
Autumn	76	1.53	0.93	1.33	1.67	0.49	0.97	1.29	1.84	5.80
Winter	74	1.37	0.60	1.23	1.64	0.15	1.00	1.20	1.60	3.40
Individual yearly averages	98	1.28	0.50	1.20	1.43	0.56	0.94	1.20	1.46	2.97