Low CT attenuation and high fatty infiltration rate of psoas are risk factors for incisional hernias after appendicectomy: a cross-sectional single-center study from China

Table 2 Comparison of demographic data and CT measurements between IH and non-IH groups

	IH (n = 60)	non-IH (n = 60)	Statistic	P value
CT attenuation (HU)	40.2 ± 7.6	43.0 ± 6.8	− 2.180	0.031^a
FIR (%)	4.3 (3.1–5.5)	3.1 (2.0–4.2)	3.567	< 0.001^b
PMI (cm²/m²)	5.0 (4.1–5.9)	5.9 ± 1.9	-2.034	0.042^b
Age(y)	65.2 ± 11.9	59.8 ± 14.1	2.260	0.026^a
Male (%)	36.70	55.00	4.062	0.044^c
BMI^d (kg/m²)	26.1 (23.9–27.8)	25.6 (23.4–27.5)	-0.877	0.381^b
Smoking (%)	81.70	58.30	7.778	0.005^c
Hypertension (%)	50.00	46.67	0.134	0.715^c
Diabetes (%)	18.30	20.00	0.054	0.817 ^c

^aindependent sample t-test; ^bWilcoxon signed rank test; ^cchi-square test
^dOne patient’s BMI is missing as he was too weak to stand and have his weight measurement taken
IH incisional hernias, CT computed tomography, FIR fatty infiltration rate, PMI psoas muscle index; BMI body mass index

ISSN: 1471-2474