Table 2.

Serum chromium levels and the occurrence of lung cancer

Quartile	Cr level (μg/L)	Cases	Controls	OR (95% CI)	p- value
I	0.03–0.07	38	71	1.23 (0.60–2.52)	0.58
II	0.08–0.09	24	50	1.00 (−)	–
III	0.10–0.14	86	55	3.97 (1.98–7.94)	< 0.01
IV	0.15–1.63	70	42	4.52 (2.17–9.42)	< 0.01

Italics - Results with statistical significance