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Table 1 Characteristics of the population.

From: The counterintuitive effect of multiple injuries in severity scoring: a simple variable improves the predictive ability of NISS

Characteristics Survivors (n = 2174) Non survivors (n = 314) Total
(2488)
Difference between survivors and non-survivors*
Age (n = 2488), mean ± SD,
median (range)
44.0 ± 21.4, 41 (1-93) 61.5 ± 23.9, 70 (1-98) 46.3 ± 22.5, 43 (1-98) p < 0.01
Gender (n = 2488), No of males (%) 1634 (75.2) 221 (70.4) 1855 (74.6) p = 0.06
Mechanism of injury, No (%)     p < 0.01
Traffic 1509 (69.4) 180 (57.3) 1689 (67.9)  
Fall 465 (21.4) 104 (33.1) 569 (22.9)  
Penetrating 28 (1.3) 9 (2.9) 37 (1.5)  
Other 144 (6.6) 19 (6.1) 163 (6.5)  
Missing or unknown 35 (1.1) 2 (0.6) 30 (1.2)  
NISS (n = 2488), mean ± SD,
median (range)
30.00 ± 13.6, 27 (1-75) 44.33 ± 18.4, 43 (1-75) 31.81 ± 15.0, 29 (1-75) p < 0.01
Motor component of GCS, No (%)     p < 0.01
6 - Obeys 1411 (64.9) 101 (29.6) 1512 (60.8)  
5 - Localizes 329 (15.1) 37 (11.8) 366 (14.7)  
4 - Withdraws 128 (5.9) 30 (9.5) 158 (6.3)  
3 - Decorticate flexion 77 (3.5) 21 (6.7) 98 (3.9)  
2 - Extensor response 65 (2.9) 25 (8.0) 90 (3.6)  
1 - Nil 121 (5.6) 93 (29.6) 214 (8.6)  
missing 43 (2.0) 7 (2.2) 50 (2.0)  
Systolic Blood Pressure, No (%)     p <0.01
180-max 88 (4.1) 42 (13.4) 130 (5.2)  
90-179 1810 (83.3) 179 (57.0) 1989 (79.9)  
50-89 191 (8.8) 72 (22.9) 263 (10.6)  
1-49 8 (0.4) 8 (2.5) 16 (0.6)  
missing 77 (3.5) 13 (4.1) 90 (3.6)  
ICU admission, No (%) 1911 (87.9) 310 (98.7) 2221 (89.3) p < 0.01
ICU stay (days), mean (median) 8.91 (5) 5.78 (2) 8.47 (4) p < 0.01
Hospital stay (days), mean (median) 27.29 (16) 8.61 (2) 24.68 (14) p < 0.01
ISS>15, No (%) 1798 (82.7) 289 (92.0) 2086 (83.9) p < 0.01
ICU stay (days), mean, median 10.04, 6 5.81, 2 9.38, 5 p < 0.01
Hospital stay (days), mean, median 26.43, 15 7.55, 2 23.82, 13 p < 0.01
Number of injuries, No (%)     p = 0.75
1 210 (9.7) 30 (9.5) 240 (9.6)  
2 267 (12.3) 34 (10.8) 301 (12.1)  
3 or more 1696 (78.0) 250 (79.6) 1946 (78.2)  
Mortality, No (%) / / 314 (12.6) /
  1. * Kruskal-Wallis test for continuous variables and chi-square test for categorical variables