Table 2. Prevalence of Wound Symptoms and Other Serial Features in 5 Days Prior, 1 Day Prior, and Day of SSI.

	Days -5 to -1 (cumulative/maximum)†			Day -1 (only)			Day 0 (only)
	No SSI	SSI	p Value	No SSI	SSI	p Value	No SSI	SSI	p Value
Wound symptoms, % abnormal*
Granulation amount	12.5	41.8	<0.001	7.1	35.0	<0.001	6.2	62.7	<0.001
Exudate amount	52.2	77.6	<0.001	19.5	56.5	<0.001	15.1	77.7	<0.001
Slough amount	9.3	30.3	<0.001	5.0	24.5	<0.001	5.2	44.3	<0.001
Edge distance	20.3	47.1	<0.001	12.2	38.7	<0.001	9.8	69.7	<0.001
Odor	1.5	4.2	0.022	0.2	2.5	<0.001	0.5	7.1	<0.001
Exudate type	38.9	66.7	<0.001	13.7	46.0	<0.001	12.2	70.8	<0.001
Slough type	9.4	30.9	<0.001	5.3	25.2	<0.001	5.2	44.3	<0.001
Wound edge color	95.4	93.9	0.410	84.6	88.9	0.170	83.2	89.5	0.048
Induration amount	94.6	93.9	0.750	86.3	79.1	0.022	86.5	73.5	<0.001
Other serial features
NG tube, %	24.6	56.6	<0.001	9.2	26.8	<0.001	6.4	21.2	<0.001
Wound culture, %	0.60	7.8	<0.001	0.10	4.4	<0.001	0.80	23.8	<0.001
Heart rate, bpm, mean	92.6	102.5	<0.001	82.2	90.1	<0.001	81.9	89.7	<0.001
Temp. of body minus wound, °C, mean	6.8	7.3	0.014	5.8	6.3	0.004	5.9	6.4	0.005
Wound length, cm, mean	23.0	24.8	0.001	22.0	24.0	<0.001	22.2	24.1	<0.001
Tympanic temp., °C, mean	37.6	37.9	<0.001	37.2	37.3	0.003	37.1	37.4	<0.001
Diastolic BP, mmHg, mean	84.9	81.8	0.005	76.6	73.6	0.008	76	72.7	0.008
Pain rating (0-100), mean	32.6	33.8	0.590	18.5	19.4	0.640	15.3	24.7	<0.001

^*Symptoms were considered abnormal if they had a score >0 (see Supplemental Table 1)

^†For wound symptoms and other serial features with binary values, symptom was considered present if it was noted on any of the 5 days leading up to infection; for other serial features with continuous values, the maximum value over the 5 days was averaged for each group (No SSI, SSI).

BP, blood pressure; NG, nasogastric; SSI, surgical site infection