Classification of positive blood cultures: computer algorithms versus physicians' assessment - development of tools for surveillance of bloodstream infection prognosis using population-based laboratory databases

Table 2 Characteristics of reference episodes and computer episodes without reference episodes

Text	Reference episodes	Computer episodes without reference episodes	p-value
All episodes, number	9,482	1,089
Age, years	71.6 (58.1-81.7)¹	70.2 (58.5-81.7)	0.54
Females	4,531 (47.8)²	483 (44.4)	0.03
Charlson comorbidity score³			0.33
0	2,370 (25.0)	252 (23.1)
1-2	3,449 (36.4)	396 (36.4)
>2	3,663 (38.6)	441 (40.5)
30-day mortality	1,998 (21.1)⁴	284 (26.1)⁵	0.0001
Separate episodes⁶, number	9,102	796
Age, years	71.6 (58.1-81.7)	69.6 (58.2-81.2)	0.16
Females	4,382 (48.1)	368 (46.2)	0.30
Charlson comorbidity score			0.85
0	2,309 (25.4)	197 (24.8)
1-2	3,319 (36.5)	298 (37.4)
>2	3,474 (38.2)	301 (37.8)
30-day mortality	1,926 (21.2)⁴	233 (29.3)⁵	0.0001

¹ Median (25^th-75^th percentile); ² Number (percent); ³ Cf. [21] and text; ⁴ Could not be assessed for 10 reference episodes; ⁵ Could not be assessed for 1 episode; ⁶ Exclusion of the 280 patients who had reference episodes and computer episodes without reference episodes.

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