Table 2.

Studies reporting IGF-I and IGFBP-3 levels in lung cancer patients and their controls

Serum factors	References	Cases			Cases
		N1	Mean(ng/ml)	SD(ng/ml)	N2	Mean(ng/ml)	SD(ng/ml)
IGF-1	[14]	93	---	---	186	---	---
	[15]	230	123	46.43	740	127	41.62
	[16]	159	158	56	297	153	54
	[17]	194	124	54	9351	126	57
	[18]	200	137.2	52.3	400	145.5	52
	[19]	167	---	---	498	---	---
IGFBP-3	[14]	93	---	---	186	---	---
	[15]	230	1793	487.43	740	1863	458.76
	[16]	159	30700	8200	297	29400	7900
	[17]	194	2780	860	9351	2990	810
	[18]	200	2228	650	400	2369	640
	[19]	167	---	---	498	---	---

N1 is the number of cases, N2 is the number of controls; ---, not available.