Table 2.

Causative pathogens identified preoperatively and their proportions.

Pathogen	Bioactive glass	Autologous bone graft
Total number of patients with known pathogens	$n=\mathrm{45}$	$n=\mathrm{26}$
Total number of positive microbiology findings${}^{\mathrm{a}}$	$n=$ 79 (100 %)${}^{\mathrm{b}}$	$n=$ 39 (100 %)${}^{\mathrm{b}}$
Staph. aureus	$n=$ 22 (28 %)	$n=$ 8 (21 %)
COST	$n=$ 22 (28 %)	$n=$ 11 (28 %)
MRSA	$n=$ 2 (2 %)	$n=$ 3 (7 %)
Streptococcus	$n=$ 6 (8 %)	$n=$ 0 (0 %)
Enterococcus	$n=$ 5 (6 %)	$n=$ 1 (3 %)
Enterobacter	$n=$ 3 (4 %)	$n=$ 2 (5 %)
Proteus	$n=$ 1 (1 %)	$n=$ 1 (3 %)
Serratia	$n=$ 3 (4 %)	$n=$ 1 (3 %)
Pseudomonas	$n=$ 6 (8 %)	$n=$ 0 (0 %)
E. coli	$n=$ 3 (4 %)	$n=$ 5 (12 %)
Others	$n=$ 6 (8 %)	$n=$ 7 (18 %)

COST: coagulase-negative Staphylococci; MRSA: methicillin-resistant Staph. aureus; E. coli: Escherichia coli. ${}^{\mathrm{a}}$ Multiple nominations per patient possible. ${}^{\mathrm{b}}$ Percentages are given in relation to all positive microbiology findings, not in relation to the number of patients; therefore, differences are possible compared to Table 1 (percentages in relation to the number of analyzed patients).