Table 5.

Serum chromium levels and the occurrence of stage I of lung cancer

Quartile	Cr level (μg/L)	Cases	Controls	OR (95%CI)	p- value
I	0.03–0.07	9	27	1.00 (−)	–
II	0.08–0.10	10	17	2.34 (0.62–8.76)	0.21
III	0.11–0.15	30	11	8.72 (2.56–29.76)	< 0.01
IV	0.16–1.36	22	16	5.15 (1.49–17.78)	0.01

Italics - Results with statistical significance