Table 3.

Serum chromium levels and the occurrence of stages I–II of lung cancer

Quartile	Cr level (μg/L)	Cases	Controls	OR (95% CI)	p- value
I	0.03–0.07	15	38	1.00 (−)	–
II	0.08–0.10	21	33	1.91 (0.70–5.17)	0.21
III	0.11–0.14	37	16	6.01 (2.32–15.54)	< 0.01
IV	0.15–1.36	38	24	5.07 (1.95–13.19)	< 0.01

Italics - Results with statistical significance