Serum ferritin and the risk of early-onset colorectal cancer

Table 3 Median serum ferritin in patients diagnosed with early-onset colorectal cancer stratified by sex, American Joint Committee on Cancer stage, and anemia status

Median (IQR), ng/mL	Females (n = 45)	Males (n = 37)	Total (n = 82)
AJCC stage
I	23.5 (31.50)	8.01	13 (30.5)
II	6.02	4.0 (18.25)	9.0 (11.0)
III	13.0 (23.25)	21.0 (124.00)	14.0 (51.0)
IV	30.0 (45.00)	92.0 (170.00)	42.0 (106.0)
Anemia status
Yes	17.5 (25.50)	32.0 (127.00)	19.0 (49.00)
No	34.0 (47.00)	131.5 (97.00)	60.0 (130.00)
Sex	19.0 (31.50)	41.0 (142.00)	-

¹One case included, unable to calculate inter-quartile range (IQR).

²Three cases included, unable to calculate IQR.

Three outliers were removed with serum ferritin > 500 ng/mL [> quartile 3 (75^th percentile) plus 5 times IQR]. IQR: Inter-quartile range; AJCC: American Joint Committee on Cancer.