Table 1 Demographic and medical characteristics of the re-hospitalised inpatients and other burn inpatients.

	Re-hospitalised inpatients		Other burn inpatients		P value	IOC (%)
	Value	Missing/Unknown (%)	Value	Missing/Unknown (%)	P value	IOC (%)
Total number, n	2146	–	218,496	–		0.97
Sex, n (%)		0		0	< 0.001^a
Male	1551 (72.27)		146,285 (66.95)			1.05
Female	595 (27.73)		72,211 (33.05)			0.82
Age (year), Median (Quartile 1, Quartile 3)	31 (10.44)	0.09	40 (22.53)	0.15	< 0.001^b
Occupation, n (%)		10.90		9.08	< 0.001^a
Blue-collar worker	534 (27.93)		34,926 (17.58)			1.51
Office staff	104 (5.44)		9688 (4.88)			1.06
Self-employed and freelance	43 (2.25)		7306 (3.68)			0.59
Unemployed	201 (10.51)		18,766 (9.45)			1.06
Farmer	262 (13.7)		41,109 (20.69)			0.63
Retiree	17 (0.89)		9157 (4.61)			0.19
Student	118 (6.17)		9176 (4.62)			1.27
Others	633 (33.11)		68,531 (34.5)
TBSA (%), Median (Quartile 1, Quartile 3)	27 (10, 52)	36.39	8 (4.17)	57.97	< 0.001^b
Site of burns, n (%)		58.99		43.47
Cranio-facio-cervical region	520 (59.09)		52,965 (43.31)		< 0.001^a	0.97
Upper limbs	673 (76.48)		48,063 (39.3)		< 0.001^a	1.38
Lower limbs	381 (43.30)		55,067 (45.03)		0.30	0.69
Trunk	287 (32.61)		22,257 (18.2)		< 0.001^a	1.27
Buttocks and perineum	58 (6.59)		3501 (2.86)		< 0.001^a	1.63
Inhalation injury	449 (51.02)		9437 (7.72)		< 0.001^a	4.54
Multiple regions	13 (1.48)		1450 (1.19)		0.43	0.89
Surgical treatment strategies, n (%)		–		–	< 0.001^a
Operating group	1508 (70.27)		64,417 (29.48)			2.29
Non-operating group	638 (29.73)		154,079 (70.52)			0.41

The denominator of percentage represented in parentheses of “Value” columns is equal to the total number of re-hospitalised inpatients or other burn inpatients subtracting the number of data missing or unknown of each variable, and the numerator is the number of each variable represented in the same cell. χ²–tests and Mann–Whitney U test were performed to test the difference of distributions between the re-hospitalised inpatients and other burn inpatients regard to those variables and labeled as “a” and “b” in the column of P value, respectively. IOC incidence of scar contracture-associated re-hospitalisation. TBSA total body superficial area.

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