World Journal of Surgical Oncology

Table 2 Characteristics of the matched study population in the SA-1

From: Neoadjuvant vs definitive concurrent chemoradiotherapy in locally advanced esophageal squamous cell carcinoma patients

		Surgery		CCRT		Standardized difference^a
		Number or mean (sd)^a	(%)^a	Number or mean (sd)^a	(%)^a	Standardized difference^a
Age		57.00 (7.63)		56.61 (9.62)		0.05
Gender	Female	6	(5)	3	(3)	0.14
Gender	Male	104	(95)	107	(97)
Residency	Non-north	76	(69)	80	(73)	0.08
Residency	North	34	(31)	30	(27)
Tumor size	≤ 5 cm	43	(39)	42	(38)	0.02
Tumor size	> 5 cm	67	(61)	68	(62)
Differentiation	Poorly/undifferentiated	41	(37)	42	(38)	0.02
Differentiation	Well/moderately	69	(63)	68	(62)
RT delivery	Non-IGRT	94	(85)	96	(87)	0.05
RT delivery	IGRT	16	(15)	14	(13)
Institution	Low volume	40	(36)	45	(41)	0.09
Institution	High volume	70	(64)	65	(59)
Use of PET	Without	12	(11)	12	(11)	0.00
Use of PET	With	98	(89)	98	(89)
Location	Cervical	1	(1)	1	(1)	0.00
Location	Noncervical	109	(99)	109	(99)

sd standard deviation, RT radiotherapy, IGRT image-guided RT, PET positron emission tomography, CCRT concurrent chemoradiotherapy
^aRounded

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ISSN: 1477-7819

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