Assessment of the effectiveness of weight-adjusted antibiotic administration, for reduced duration, in surgical prophylaxis of primary hip and knee arthroplasty

Table 1 Demographic information for patients treated with the old regime and new regime of perioperative antibiotic prophylaxis, n (%)

	Old regime	New regime
	n = 669 patients	n = 595 patients
Age (mean ± SD)	69.3 ± 11.9 yr	68.8 ± 10.5 yr
Gender (male)	279 (41.7)	214 (40.0%)
BMI (mean ± SD)	32.2 ± 11.0	31.8 ± 7.4
Operation performed
THA	THA, n = 291 (43.1)	THA, n = 243 (40.6)
TKA	TKA, n = 384 (56.9)	TKA, n = 355 (59.4)

BMI: Body mass index; SD: Standard deviation; THA: Total hip arthroplasty; TKA: Total knee arthroplasty.