Table 2.
Overview of observed variables with number of horses (n) and missing observations in each variable in a retrospective study of 297 colic surgeries in Norway 2005 - 2011
| Variable | n | Missing (%) |
|---|---|---|
| Prior to admission |
|
|
| Duration of signs (hours) |
271 |
26 (8.8) |
| Transport time (minutes) |
292 |
5 (1.7) |
| Preoperative variables |
|
|
| Heart rate (beats\minute) |
271 |
26 (8.8) |
| Respiration rate (elevated\not elevated) |
151 |
146 (49.2) |
| Rectal temperature (˚celsius) |
167 |
130 (43.8) |
| Capillary refill time (seconds) |
227 |
70 (23.6) |
| Mucosal membranes (appearance) |
268 |
29 (9.8) |
| Normal, pale, toxic, cyanotic or sligthly abnormal |
|
|
| Rectal examination |
235 |
62 (20.9) |
| Normal, impaction of large intestine, displaced colon, tympanic colon or distended small intestine |
|
|
| Borborygmia |
237 |
60 (20.2) |
| None, reduced, normal, increased or tympanic |
|
|
| Nasogastric reflux (positive\negative) |
155 |
142 (47.8) |
| Hematocrit |
251 |
46 (15.5) |
| Total solids in plasma (gram\litre) |
246 |
51 (17.2) |
| Lactate in blood (mmol\litre) |
153 |
144 (48.5) |
| Intraoperative variables |
|
|
| Anesthesia duration (minutes)* |
187 |
32 (10.7) |
| Enterotomy (performed\not performed)* |
219 |
0 (0.0) |
| Intestinal resection (performed\not performed)* |
219 |
0 (0.0) |
| Anesthetist |
244 |
53 (17.8) |
| Primary surgeon |
286 |
11 (3.7) |
| Secondary surgeon |
210 |
87 (29.3) |
| Surgeon board-certification (yes\no) |
294 |
3 (1.0) |
| Daytime vs. out-of-hours |
283 |
14 (4.7) |
| Postoperative variables |
|
|
| Hospitalisation duration (days)* | 218 | 1 (0.4) |
*Excludes cases that were euthanized during surgery (n = 78).