Table 2. Summary of basic characteristics of the included literature.

Study number	Author	Study location	Date of publication	Total cases	Clinic effect	Quality score (points)
1	Indrio F et al. (13)	Italy, Bari	2017	60	[1][2][5]	6
2	Patole S et al. (14)	Australia, Perth	2014	159	[1][5]	5
3	Kaban RK et al. (15)	Indonesia, Jakarta	2019	94	[3][6][7][9]	7
4	Costalos C et al. (16)	Greece, Athens	2003	87	[1][2][4]	6
5	Stratiki Z et al. (17)	Greece, Athens	2007	77	[1][2][4]	6
6	Xu L et al. (18)	China, Shenyang	2016	125	[1][4][5][6][7][8][9]	8
7	Sari FN et al. (19)	Turkey, Altindag-Ankara	2011	221	[2][3][4]	6
8	Demirel G et al. (20)	Turkey, Samsun	2013	271	[1][2][3]	6
9	Fernández-Carrocera LA et al. (21)	Mexico, Distrito Federal	2013	150	[2][5]	5

[1] Time to reach full enteral feeds; [2] weight gain; [3] incidence of feeding intolerance; [4] maximum enteral feeding; [5] time of hospital stay; [6] gastrointestinal symptoms; [7] vomiting; [8] gastric residuals; [9] abdominal distension.