TABLE 3.

Summary of studies exploring the relationship between the levels of IGF-1 and IS.

References	Race	Case		Control		Sample size		Origin
		Mean	SD	Mean	SD	Case	Control
Schwab et al. (1997)	No mentioned	105.00	23.00	161.00	10.00	20	8	Plasma
Kaplan et al. (2007)	African-American	150.30	58.30	152.20	58.30	370	1,122	Plasma
Wang Y. et al. (2014)	China	122.32	86.60	77.60	53.15	79	75	Plasma
Denti et al. (2004)	Italy	69.00	45.00	102.00	67.00	85	88	Serum
Johnsen et al. (2005)	Danish	107.10	33.30	112.90	33.20	254	254	Serum
Aberg et al. (2011)	Western Sweden	171.00	3.30	145.40	9.40	407	40	Serum
Iso et al. (2012)	Japan	113.00	52.00	106.00	48.00	71	71	Serum
Dong et al. (2014)	China	130.40	32.80	141.40	25.40	240	200	Serum
Wang T. et al. (2014)	China	107.16	18.03	122.79	15.55	124	96	Serum
Shaheen et al. (2018)	Arab	143.40	12.60	156.00	11.20	200	100	Serum
Zhang W. et al. (2018)	China	115.50	37.30	158.50	27.80	225	120	Serum