Table 5. Features Selected for Final Complex SF Model and Simplified SF Model, In Order of Decreasing Predictive Importance.

Original data element from which feature was derived	Lookback period (days)	Transformation type	Odds ratio
Complex SF model (Naïve Bayes)
Granulation score	2	Mean value
Exudate amount score	3	Maximum value
Nasogastric tube presence	2	Maximum value
Granulation score	5	Maximum value
Nasogastric tube presence	5	Maximum value
Heart rate	3	Maximum value
Heart rate	4	Daily change
Temperature of wound minus skin	5	Deviation from trend
Wound length	2	Maximum value
Wound culture ordered	5	Maximum value
Body temperature	5	Maximum value
Diastolic blood pressure	2	Raw value
Simplified SF model (Logistic regression)
Nasogastric tube presence	2	Maximum value	1.91 (binary)
Exudate amount score	2	Maximum value	1.24 (per score increment)
Heart rate	2	Maximum value	1.18 (per 10 bpm)
Slough type score	2	Maximum value	1.18 (per score increment)
Wound length	2	Maximum value	1.02 (per cm)

SF, serial features