Quantification of surgical trauma: comparison of conventional and minimally invasive surgical techniques for pertrochanteric fracture surgery based on markers of inflammation (interleukins)

Journal of Orthopaedics and Traumatology

Official Journal of the Italian Society of Orthopaedics and Traumatology

Table 3 Chi-square test for discrete quantitative variables

	Conventional (36 subjects)	MIO (32 subjects)	p Value^a
Sex
Men	4 (30.8 %)	9 (69.2 %)	0.0771
Females	32 (58.2 %)	23 (41.8 %)
Type of fracture			0.4442
A1	10 (66.7 %)	5 (33.3 %)	0.5383^b
A2	20 (47.6 %)	22 (52.4 %)	0.2087^c
A3	6 (54.5 %)	5 (45.5 %)	0.6853^d
Type of fixation			0.3218
Type 1 (2–3 holes)	7 (38.9 %)	11 (61.1 %)	0.2866^b
Type 2 (4 holes + ATSP/antirot. screw/cercl.)	12 (63.2 %)	7 (36.8 %)	0.1454^c
Type 3 (5 or more holes/+ATSP/antirot. screw/cercl.)	17 (54.8 %)	14 (45.2 %)	0.5668^d
Anticoagulant/antiplatelet	17 (58.6 %)	12 (41.4 %)	0.4184

Some variables such as sex, type of diagnosis, type of fixation, and taking anticoagulant/antiplatelet drugs were grouped into discrete quantitative variables, for which we performed the chi-square test to assess significant differences between the two groups. There were no significant differences between groups for these variables
^aChi-square with two degrees of freedom in a 3 × 2 contingency table. Chi-square breakdown to compare the classes of covariates:
^bFirst class with third class
^cFirst class with second class
^dSecond class with third class