Table 4

Risk of bacterial arthritis by susceptibility index (SI) after infections and invasive medical procedures for a 60 year old male patient with joint disease

SI^4-150		Risk of bacterial arthritis in % (95% CI) after a:
SI^4-150		Dermal infection	Urinary or respiratory tract infection	Invasive medical procedure^4-151
0	0.03 (0.009 to 0.1)	0.004 (0.001 to 0.03)	0.001
1	0.08 (0.03 to 0.3)	0.01 (0.002 to 0.08)	0.003
2	0.2 (0.1 to 0.6)	0.03 (0.009 to 0.02)	0.008
3	0.6 (0.4 to 1)	0.09 (0.03 to 0.4)	0.02
4	2 (1 to 4)	0.2 (0.1 to 1)	0.06

↵4-150 The SI is a sum score, based on the presence of a knee/hip prosthesis (2 points), diagnosis of rheumatoid arthritis (1 point), comorbidity (1 point), age of 80 and over (1 point) (see table 3). For a 60 year old patient, the SI ranges from 0 to 4 because age does not pose an additional risk.
↵4-151 Dental, skin, ear, nose, throat, gastrointestinal tract, respiratory tract, urinary tract, female genital tract. The 95% CI could not be calculated because the risk estimates were not based on empirical data.